Fix SQLite query compatibility inside WITH clause

Rename model methods to #succeeding.

.gitignore

@@ -15,6 +15,9 @@
 /config/master.key
 /config/puma.rb
 
+# Ignore test database.
+/db/test.sqlite3
+
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*
@@ -30,7 +33,7 @@
 
 /tmp/restart.txt
 
-# Ignore user files
+# Ignore user files.
 /.bash_history
 /.byebug_history
 /.config
@@ -38,6 +41,7 @@
 /.lesshst
 /.local
 /.mysql_history
+/.sqlite_history
 /.ssh
 /.vim
 /.viminfo

CLAUDE.md

@@ -1,106 +0,0 @@
-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Project Overview
-
-Fixin.me is a "quantified self" Rails 7.2.3 application for personal data tracking. Users define hierarchical **quantities** (metrics to track), **units** (with optional conversion hierarchies), and **readouts** (individual measurements). There is also a non-persistent **measurement** model used as a form wrapper.
-
-## Setup
-
-Configuration files are distributed as `.dist` templates — copy and customize before use:
-
-```bash
-cp config/application.rb.dist config/application.rb
-cp config/database.yml.dist config/database.yml
-cp config/puma.rb.dist config/puma.rb
-```
-
-```bash
-bundle config --local frozen true
-bundle config --local path .gem
-bundle config --local with mysql development test   # or: pg, sqlite
-bundle install
-RAILS_ENV=development bundle exec rails db:create db:migrate db:seed
-```
-
-## Common Commands
-
-```bash
-bundle exec rails s                                          # start server
-bundle exec rails test                                       # all unit/model/controller tests
-bundle exec rails test:system                                # all system tests (Capybara + Selenium)
-bundle exec rails test test/system/units_test.rb            # single test file
-bundle exec rails test --seed 64690 --name test_add_unit    # single test by name
-bundle exec rails db:seed:export                             # export default settings as seed file
-```
-
-## Architecture
-
-### Data Model
-
-- **Quantity** — hierarchical tree (self-referential `parent_id`). Cached `depth` and `pathname` fields are recomputed via recursive CTEs on write. Direct assignment to cached fields is blocked.
-- **Unit** — optional hierarchy via `base_id` and `multiplier` for unit conversion. Multiplier precision/scale is validated by a custom validator.
-- **Readout** — single measurement: `value` (IEEE 754 float), `quantity`, `unit`, `category`.
-- **Measurement** — `ActiveModel::Model` form wrapper (not database-backed); bridges the readout creation form.
-- **User** — Devise-managed with a status enum: `admin`, `active`, `restricted`, `locked`, `disabled`. Admins can disguise as other users.
-
-### Hierarchical Queries
-
-Both `Quantity` and `Unit` use recursive CTEs for tree traversal (ordered traversal, ancestors, progenies, common ancestors). `lib/core_ext/arel/` patches Arel to support CTE with `UPDATE`/`DELETE` statements, working around Rails issue #54658.
-
-### Custom Extensions (`lib/core_ext/`)
-
-- **arel/** — CTE support for UPDATE/DELETE
-- **active_model/** — precision/scale validator used by `Unit#multiplier`
-- **active_record/** — `attr_cached` mechanism (see `ApplicationRecord`)
-- **action_view/** — record identifier suffixes
-- Miscellaneous: `Array#delete_bang`, `BigDecimal` scientific notation
-
-### Response Handling
-
-Controllers respond to both HTML and Turbo Stream formats. Errors during Turbo Stream requests trigger a redirect with flash rather than rendering inline, handled in `ApplicationController`.
-
-### Numeric Precision
-
-Readout values are stored as IEEE 754 double-precision floats (not fixed-point decimals). Rationale in `DESIGN.md`: biological values span many orders of magnitude; 15-digit float precision is sufficient and avoids conversion overhead.
-
-### Routes
-
-```
-measurements   GET/POST /measurements
-readouts       GET/POST /readouts, DELETE /readouts/:id/discard
-quantities     CRUD + POST /quantities/:id/reparent
-units          CRUD + POST /units/:id/rebase
-users          CRUD + POST /users/:id/disguise, POST /users/revert
-default/       namespace for default units import/export and admin panel
-root           → /units (authenticated), /sign_in (unauthenticated)
-```
-
-## JavaScript Conventions
-
-### No manual fetch() — use Turbo
-
-Never make AJAX requests with `fetch()` in JavaScript. Use Turbo's built-in mechanisms instead:
-
-- **Links/buttons that trigger server actions**: use `data: {turbo_stream: true}` on the element (link or button_to form).
-- **Dynamic form submissions from JS** (where HTML alone isn't enough): create a form element, append hidden inputs, and call `form.requestSubmit()`. Turbo intercepts it automatically — no manual CSRF handling, no `Turbo.renderStreamMessage()`.
-  ```javascript
-  var form = document.createElement('form');
-  form.action = url; form.method = 'post'; form.dataset.turboStream = 'true';
-  // append hidden inputs...
-  form.addEventListener('turbo:submit-end', function() { form.remove(); });
-  document.body.appendChild(form);
-  form.requestSubmit();
-  ```
-- **Server-rendered HTML**: use ERB partials and Turbo Stream views (`*.turbo_stream.erb`), never build HTML in JavaScript.
-
-### No HTML generation in JavaScript
-
-Never use JavaScript to build and insert HTML (no `innerHTML =`, no `createElement` trees for content). Render HTML server-side in ERB partials; update the DOM via Turbo Stream actions (`replace`, `update`, `append`, etc.).
-
-## Database Requirements
-
-The database must support:
-- Recursive CTEs with `UPDATE`/`DELETE` (MySQL ≥ 8.0, PostgreSQL, or SQLite3)
-- Decimal precision of 30+ digits

DESIGN.md

@@ -22,13 +22,55 @@ whenever a change is considered, to avoid regressions.
           and scale approximately half of that - 9,
     * double precision floating point guarantees 15 digits of precision, which
       is more than enough for all expected use cases,
+        * if a decimal string with at most 15 significant digits is converted to
+          the IEEE 754 double-precision format, giving a normal number, and then
+          converted back to a decimal string with the same number of digits, the
+          final result should match the original string,
+        * if an IEEE 754 double-precision number is converted to a decimal
+          string with at least 17 significant digits, and then converted back to
+          double-precision representation, the final result must match the
+          original number,
         * single precision floating point only guarntees 6 digits of precision,
           which is estimated to be too low for some use cases (e.g. storing
-          latitude/longitude with a resolution grater than 100m)
+          latitude/longitude with a resolution grater than 100m),
 * double precision floating point (IEEE 754) is a standard that ensures
-  compatibility with all database engines,
+  compatibility with majority of database engines,
     * the same data format is used internally by Ruby as a `Float`; it
       guarantees no conversions between storage and computation,
     * as a standard with hardware implementations ensures both: computing
       efficiency and hardware/3rd party library compatibility as opposed to Ruby
-      custom `BigDecimal` type
+      custom `BigDecimal` type,
+    * at present, only normalized numbers are used and considered sufficient, in
+      order to avoid potential issues with the cross-platform compatibility of
+      subnormal (denormal) numbers,
+* in the future, the IEEE 754 decimal64 data type may be considered once it is
+  supported by database engines.
+
+### Database layer vs application layer data model constraints
+
+* database constraints are the final guard against data integrity corruption,
+    * they should safeguard against data referential integrity loss under _all_
+      data (not schema) manipulation scenarios, including application level
+      logic errors and direct data manipulation (e.g. through `dbconsole`),
+* application constraints can be as restrictive as database constraints or more,
+  but not less, as it doesn't serve any use case,
+    * proper application level constraints should prevent unhandled database
+      exception occurences, e.g `ActiveRecord::InvalidForeignKey` for operations
+      performed through Models (i.e. not `#delete_all` etc.)
+
+### User interface
+* values provided by user have to be exactly preserved, avoiding any precision
+  loss due to e.g. type casting
+    * when it's not possible to store value without information loss, feedback has to
+      be given at the time of entering value
+    * values can be received using either:
+        * `input[number]` - validates: number format, value against `[min]` and
+          `[max]` attributes; cannot validate precision (no `[pattern]` support);
+          or
+        * `input[text]` - can validate number format and precision with
+          `[pattern]`; cannot validate range (no `[min]`/`[max]` support),
+        * none of the above prevents misinterpretation of values between 0 and
+          Float::MIN as 0.0 - this has to be checked manually,
+        * assuming that user input with _precision > DIG_ is as rare as in
+          the range _(0, MIN)_, the decision is to choose input which requires
+          the least/simplest additional code.

Gemfile

@@ -1,14 +1,14 @@
 source "https://rubygems.org"
 
-# The requirement for the Ruby version comes from Rails
+# The requirement for the Ruby version comes from Rails.
-gem "rails", "~> 7.2.3"
+gem "rails", "~> 8.1.4"
 gem "sprockets-rails"
 gem "puma", "~> 6.0"
 gem "sassc-rails"
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ]
 
-# TODO: select db gems automatically
+# TODO: select db gems automatically?
 #   database_config = ERB.new(File.read("config/database.yml")).result
 #   YAML.load(database_config, aliases: true).values.map { |env| env["adapter"] }.uniq
 group :mysql, optional: true do
@@ -21,7 +21,7 @@ group :sqlite, optional: true do
   gem "sqlite3", "~> 2.7"
 end
 
-gem "devise"
+gem "devise", "~> 5.0.4"
 
 gem "importmap-rails"
 gem "turbo-rails", "~> 2.0"
@@ -42,11 +42,8 @@ group :test do
   # Use system testing [https://guides.rubyonrails.org/testing.html#system-testing]
   gem "capybara"
   gem "selenium-webdriver"
-
-  # Remove minitest version restriction after error fixed:
-  #   railties-7.2.3/lib/rails/test_unit/line_filtering.rb:7:in `run':
-  #     wrong number of arguments (given 3, expected 1..2) (ArgumentError)
-  #   from /var/www/.gem/ruby/3.3.0/gems/minitest-6.0.2/lib/minitest.rb:473:in
-  #     `block (2 levels) in run_suite'
-  gem "minitest", "< 6"
 end
+
+# TODO: remove after upgrade to next version containing PR:
+#   https://github.com/ruby-i18n/i18n/pull/755
+gem "i18n", git: "https://github.com/ruby-i18n/i18n", branch: "delegate-missing-interpolation-handler"

Gemfile.lock

@@ -1,85 +1,93 @@
+GIT
+  remote: https://github.com/ruby-i18n/i18n
+  revision: 8850d979a3a32453123ed744b943ead8751ba73b
+  branch: delegate-missing-interpolation-handler
+  specs:
+    i18n (1.15.2)
+      concurrent-ruby (~> 1.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.2.3)
+    action_text-trix (2.1.19)
-      actionpack (= 7.2.3)
+      railties
-      activesupport (= 7.2.3)
+    actioncable (8.1.4)
+      actionpack (= 8.1.4)
+      activesupport (= 8.1.4)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.2.3)
+    actionmailbox (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activestorage (= 7.2.3)
+      activestorage (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       mail (>= 2.8.0)
-    actionmailer (7.2.3)
+    actionmailer (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       mail (>= 2.8.0)
       rails-dom-testing (~> 2.2)
-    actionpack (7.2.3)
+    actionpack (8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-      cgi
       nokogiri (>= 1.8.5)
-      racc
+      rack (>= 2.2.4)
-      rack (>= 2.2.4, < 3.3)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
       useragent (~> 0.16)
-    actiontext (7.2.3)
+    actiontext (8.1.4)
-      actionpack (= 7.2.3)
+      action_text-trix (~> 2.1.15)
-      activerecord (= 7.2.3)
+      actionpack (= 8.1.4)
-      activestorage (= 7.2.3)
+      activerecord (= 8.1.4)
-      activesupport (= 7.2.3)
+      activestorage (= 8.1.4)
+      activesupport (= 8.1.4)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.2.3)
+    actionview (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       builder (~> 3.1)
-      cgi
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activejob (7.2.3)
+    activejob (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       globalid (>= 0.3.6)
-    activemodel (7.2.3)
+    activemodel (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-    activerecord (7.2.3)
+    activerecord (8.1.4)
-      activemodel (= 7.2.3)
+      activemodel (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       timeout (>= 0.4.0)
-    activestorage (7.2.3)
+    activestorage (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       marcel (~> 1.0)
-    activesupport (7.2.3)
+    activesupport (8.1.4)
       base64
-      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      json
       logger (>= 1.4.2)
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    addressable (2.8.8)
+      uri (>= 0.13.1)
+    addressable (2.9.0)
       public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
-    bcrypt (3.1.21)
+    bcrypt (3.1.22)
-    benchmark (0.5.0)
+    bigdecimal (4.1.3)
-    bigdecimal (4.0.1)
     bindex (0.8.1)
     builder (3.3.0)
     byebug (13.0.0)
@@ -93,155 +101,155 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    cgi (0.5.1)
+    concurrent-ruby (1.3.8)
-    concurrent-ruby (1.3.6)
     connection_pool (3.0.2)
-    crass (1.0.6)
+    crass (1.0.7)
     date (3.5.1)
-    devise (5.0.2)
+    devise (5.0.4)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 7.0)
       responders
       warden (~> 1.2.3)
     drb (2.2.3)
-    erb (6.0.2)
+    erb (6.0.7)
     erubi (1.13.1)
-    ffi (1.17.3-aarch64-linux-gnu)
+    ffi (1.17.4-aarch64-linux-gnu)
-    ffi (1.17.3-aarch64-linux-musl)
+    ffi (1.17.4-aarch64-linux-musl)
-    ffi (1.17.3-arm-linux-gnu)
+    ffi (1.17.4-arm-linux-gnu)
-    ffi (1.17.3-arm-linux-musl)
+    ffi (1.17.4-arm-linux-musl)
-    ffi (1.17.3-arm64-darwin)
+    ffi (1.17.4-arm64-darwin)
-    ffi (1.17.3-x86_64-darwin)
+    ffi (1.17.4-x86_64-darwin)
-    ffi (1.17.3-x86_64-linux-gnu)
+    ffi (1.17.4-x86_64-linux-gnu)
-    ffi (1.17.3-x86_64-linux-musl)
+    ffi (1.17.4-x86_64-linux-musl)
-    globalid (1.3.0)
+    globalid (1.4.0)
       activesupport (>= 6.1)
-    i18n (1.14.8)
-      concurrent-ruby (~> 1.0)
     importmap-rails (2.2.3)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
-    io-console (0.8.2)
+    io-console (0.9.4)
-    irb (1.17.0)
+    irb (1.18.0)
       pp (>= 0.6.0)
       prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
+    json (3.0.2)
     logger (1.7.0)
-    loofah (2.25.0)
+    loofah (2.25.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
-    mail (2.9.0)
+    mail (2.9.1)
       logger
       mini_mime (>= 0.1.1)
       net-imap
       net-pop
       net-smtp
-    marcel (1.1.0)
+    marcel (1.2.1)
     matrix (0.4.3)
     mini_mime (1.1.5)
-    minitest (5.27.0)
+    minitest (6.0.6)
+      drb (~> 2.0)
+      prism (~> 1.5)
     mysql2 (0.5.7)
       bigdecimal
-    net-imap (0.6.3)
+    net-imap (0.6.7)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
-    net-protocol (0.2.2)
+    net-protocol (0.4.0)
       timeout
-    net-smtp (0.5.1)
+    net-smtp (0.5.2)
       net-protocol
     nio4r (2.7.5)
-    nokogiri (1.19.1-aarch64-linux-gnu)
+    nokogiri (1.19.4-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-aarch64-linux-musl)
+    nokogiri (1.19.4-aarch64-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm-linux-gnu)
+    nokogiri (1.19.4-arm-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm-linux-musl)
+    nokogiri (1.19.4-arm-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm64-darwin)
+    nokogiri (1.19.4-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-darwin)
+    nokogiri (1.19.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-linux-gnu)
+    nokogiri (1.19.4-x86_64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-linux-musl)
+    nokogiri (1.19.4-x86_64-linux-musl)
       racc (~> 1.4)
     orm_adapter (0.5.0)
-    pg (1.6.3)
+    pg (1.7.0)
-    pg (1.6.3-aarch64-linux)
+    pg (1.7.0-aarch64-linux)
-    pg (1.6.3-aarch64-linux-musl)
+    pg (1.7.0-aarch64-linux-musl)
-    pg (1.6.3-arm64-darwin)
+    pg (1.7.0-arm64-darwin)
-    pg (1.6.3-x86_64-darwin)
+    pg (1.7.0-x86_64-darwin)
-    pg (1.6.3-x86_64-linux)
+    pg (1.7.0-x86_64-linux)
-    pg (1.6.3-x86_64-linux-musl)
+    pg (1.7.0-x86_64-linux-musl)
-    pp (0.6.3)
+    pp (0.6.4)
       prettyprint
     prettyprint (0.2.0)
     prism (1.9.0)
-    psych (5.3.1)
+    public_suffix (7.0.5)
-      date
-      stringio
-    public_suffix (7.0.2)
     puma (6.6.1)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.2.5)
+    rack (3.2.7)
-    rack-session (2.1.1)
+    rack-session (2.1.2)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)
       rack (>= 1.3)
     rackup (2.3.1)
       rack (>= 3)
-    rails (7.2.3)
+    rails (8.1.4)
-      actioncable (= 7.2.3)
+      actioncable (= 8.1.4)
-      actionmailbox (= 7.2.3)
+      actionmailbox (= 8.1.4)
-      actionmailer (= 7.2.3)
+      actionmailer (= 8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      actiontext (= 7.2.3)
+      actiontext (= 8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activemodel (= 7.2.3)
+      activemodel (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activestorage (= 7.2.3)
+      activestorage (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       bundler (>= 1.15.0)
-      railties (= 7.2.3)
+      railties (= 8.1.4)
     rails-dom-testing (2.3.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.7.0)
+    rails-html-sanitizer (1.7.1)
-      loofah (~> 2.25)
+      loofah (~> 2.25, >= 2.25.2)
       nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
-    railties (7.2.3)
+    railties (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-      cgi
       irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
       thor (~> 1.0, >= 1.2.2)
       tsort (>= 0.2)
       zeitwerk (~> 2.6)
-    rake (13.3.1)
+    rake (13.4.2)
-    rdoc (7.2.0)
+    rbs (4.2.0)
-      erb
+      logger
-      psych (>= 4.0.0)
+      prism (>= 1.6.0)
       tsort
-    regexp_parser (2.11.3)
+    rdoc (8.1.0)
-    reline (0.6.3)
+      erb
+      prism (>= 1.6.0)
+      rbs (>= 4.0.0)
+      tsort
+    regexp_parser (2.13.1)
+    reline (0.7.0)
       io-console (~> 0.5)
-    responders (3.2.0)
+    responders (3.2.1)
       actionpack (>= 7.0)
       railties (>= 7.0)
-    rexml (3.4.4)
+    rubyzip (3.7.0)
-    rubyzip (3.2.2)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -251,54 +259,52 @@ GEM
       sprockets-rails
       tilt
     securerandom (0.4.1)
-    selenium-webdriver (4.41.0)
+    selenium-webdriver (4.50.0)
       base64 (~> 0.2)
       logger (~> 1.4)
-      rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 4.0)
       websocket (~> 1.0)
-    sprockets (4.2.2)
+    sprockets (4.4.1)
-      concurrent-ruby (~> 1.0)
+      concurrent-ruby (~> 1.1)
       logger
       rack (>= 2.2.4, < 4)
     sprockets-rails (3.5.2)
       actionpack (>= 6.1)
       activesupport (>= 6.1)
       sprockets (>= 3.0.0)
-    sqlite3 (2.9.0-aarch64-linux-gnu)
+    sqlite3 (2.9.6-aarch64-linux-gnu)
-    sqlite3 (2.9.0-aarch64-linux-musl)
+    sqlite3 (2.9.6-aarch64-linux-musl)
-    sqlite3 (2.9.0-arm-linux-gnu)
+    sqlite3 (2.9.6-arm-linux-gnu)
-    sqlite3 (2.9.0-arm-linux-musl)
+    sqlite3 (2.9.6-arm-linux-musl)
-    sqlite3 (2.9.0-arm64-darwin)
+    sqlite3 (2.9.6-arm64-darwin)
-    sqlite3 (2.9.0-x86_64-darwin)
+    sqlite3 (2.9.6-x86_64-darwin)
-    sqlite3 (2.9.0-x86_64-linux-gnu)
+    sqlite3 (2.9.6-x86_64-linux-gnu)
-    sqlite3 (2.9.0-x86_64-linux-musl)
+    sqlite3 (2.9.6-x86_64-linux-musl)
-    stringio (3.2.0)
     thor (1.5.0)
-    tilt (2.7.0)
+    tilt (2.9.0)
-    timeout (0.6.0)
+    timeout (0.6.1)
     tsort (0.2.0)
     turbo-rails (2.0.23)
       actionpack (>= 7.1.0)
       railties (>= 7.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    uri (1.1.1)
     useragent (0.16.11)
     warden (1.2.9)
       rack (>= 2.0.9)
-    web-console (4.2.1)
+    web-console (4.3.0)
-      actionview (>= 6.0.0)
+      actionview (>= 8.0.0)
-      activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
-      railties (>= 6.0.0)
+      railties (>= 8.0.0)
     websocket (1.2.11)
-    websocket-driver (0.8.0)
+    websocket-driver (0.8.2)
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    zeitwerk (2.7.5)
+    zeitwerk (2.8.3)
 
 PLATFORMS
   aarch64-linux-gnu
@@ -313,13 +319,13 @@ PLATFORMS
 DEPENDENCIES
   byebug
   capybara
-  devise
+  devise (~> 5.0.4)
+  i18n!
   importmap-rails
-  minitest (< 6)
   mysql2 (~> 0.5)
   pg (~> 1.5)
   puma (~> 6.0)
-  rails (~> 7.2.3)
+  rails (~> 8.1.4)
   sassc-rails
   selenium-webdriver
   sprockets-rails

README.md

@@ -16,14 +16,10 @@ environment, see the _Contributing_ section below.
 * Server side:
     * Ruby interpreter, depending on the version of Rails used (see _Gemfile_),
         * https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#ruby-versions
-    * database (e.g. MySQL >= 8.0) supporting:
+    * database (e.g. SQLite, MySQL >= 8.0) supporting:
         * recursive Common Table Expressions (CTE) for SELECT/UPDATE/DELETE,
             * MariaDB does not support CTE for UPDATE/DELETE
               (https://jira.mariadb.org/browse/MDEV-18511)
-        * decimal datatype with precision of at least 30,
-            * SQLite3 _flexible typing_ decimal will work, but precision
-              will be limited to 16, making it practical mostly for testing
-              purposes
     * for testing: browser as specified in _Client side_ requirements
 * Client side:
     * browser (e.g. Firefox >= 121) supporting:
@@ -89,14 +85,10 @@ Running
 
 ### Standalone Rails server + Apache proxy
 
-Customize Puma config template:
+Copy and customize Puma config template if required:
 
     cp -a config/puma.rb.dist config/puma.rb
 
-and specify server IP/port, either with `port` or `bind`, e.g.:
-
-    bind 'tcp://0.0.0.0:3000'
-
 #### (option 1) Start server manually
 
     bundle exec rails s -e production
@@ -123,9 +115,26 @@ Contributing
 
 ### Gems
 
-Apart from database adapter, install development and testing gems:
+Install development and testing gems, including at least MySQL and SQLite
+database adapters:
 
-    bundle config --local with mysql development test
+    bundle config --local with development test mysql sqlite
+
+#### Using gems from local git repos
+
+When working on gem PRs, it may be useful to work with proposed changes locally
+until PRs get accepted upstream. To add gem hosted in local git repository:
+
+    bundle config set local.capybara /var/www/tmp/capybara
+
+Add gem to `Gemfile`:
+
+  gem "capybara", git: "https://github.com/teamcapybara/capybara", branch: "branch-name"
+
+and install:
+
+    bundle install
+    bundle show capybara
 
 ### Configuration
 
@@ -138,20 +147,29 @@ assets.
 
 ### Database
 
-Grant database user privileges for development and test environments,
+Grant database user privileges for development and test environments. Example
-possibly with different Ruby versions:
+below shows how to grant privileges to all databases which names start with
+`fixinme-` on MySQL:
 
     > mysql -p
     mysql> create user `fixinme-dev`@localhost identified by '<some password>';
     mysql> grant all privileges on `fixinme-%`.* to `fixinme-dev`@localhost;
     mysql> flush privileges;
 
+Dumping development data before database reset:
+
+    mysqldump -h <address> -u <user> -p --no-create-info --no-tablespaces --complete-insert <database> > tmp/data.sql
+
 ### Development environment
 
 Starting application server in development environment:
 
     bundle exec rails s -e development
 
+Accessing database console when more than one test db is present:
+
+    bundle exec rails dbconsole -e test --db sqlite3
+
 For running rake tasks, prepend command with environment:
 
     RAILS_ENV=development bundle exec rails ...
@@ -164,14 +182,22 @@ Tests need to be run from within toplevel application directory:
 
         bundle exec rails test:system
 
-* system test(s) with seed/test name specified:
+* system test(s) with seed or test name specified:
 
-        bundle exec rails test:system --seed 64690 --name test_add_unit
+        bundle exec rails test:system --include test_add_unit --seed 64690
 
-* all tests from one file, with optional seed:
+* all tests from one file, optionally with seed:
 
         bundle exec rails test test/system/users_test.rb --seed 1234
 
+* system tests for selected database configuration (if multiple present):
+
+        bundle exec rails test:system --include /^test_sqlite3_/
+
+* single system test for all database configurations (if multiple present):
+
+        bundle exec rails test:system --include /^test_\\w+_add_unit$/
+
 ### Icons
 
 Pictogrammers Material Design Icons: https://pictogrammers.com/library/mdi/

app/assets/images/pictograms/view-columns.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M4,4H8V20H4V4M10,4H14V20H10V4M16,4H21V20H16V4Z"/></svg>

app/assets/images/pictograms/view-rows.svg

@@ -1 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M3,5H21V7H3V5M3,11H21V13H3V11M3,17H21V19H3V17Z"/></svg>

app/assets/stylesheets/application.css

@@ -24,6 +24,7 @@
  *
  * NOTE: style in a modular way, similar to how CSS @scope would be used,
  * to make transition easier once @scope is widely available. */
+/* TODO: change :root -> <html> ? */
 :root {
   --color-focus-gray: #f3f3f3;
   --color-border-gray: #dddddd;
@@ -36,7 +37,6 @@
   --color-blue: #009ade;
   --color-dark-red: #b21237;
   --color-red: #ff1f5b;
-  --color-purple: #8b2be2;
 
   --depth: 0;
 
@@ -58,6 +58,11 @@
 }
 /* NOTE: move to higher priority layer instead of using !important?; add CSS
  * @layer requirements in README */
+/* Disable elements with:
+ *  `[aria-disabled=true]` - non-form elements (e.g. links),
+ *  `[disabled]` - form controls, that may be enabled conditionally,
+ *  `[readonly]` - form controls, that stay disabled for form lifetime. */
+[aria-disabled=true],
 [disabled] {
   border-color: var(--color-border-gray) !important;
   color: var(--color-border-gray) !important;
@@ -111,11 +116,6 @@ svg {
 svg:last-child {
   margin-right: 0;
 }
-.chart-panel svg {
-  height: auto;
-  margin: 0;
-  width: auto;
-}
 textarea {
   margin: 0;
 }
@@ -172,6 +172,7 @@ table svg:not(:only-child) {
   width: 1.25em;
 }
 input:focus-visible,
+/* TODO: select:focus-visible is redundant with -within? */
 select:focus-visible,
 select:focus-within,
 /* TODO: how to achieve `summary:focus-within` for `::details-content`? */
@@ -205,6 +206,10 @@ textarea:invalid {
   border-color: var(--color-red);
   outline-color: var(--color-red);
 }
+pre {
+  display: inline;
+  font: inherit;
+}
 
 /* `.button`: button-styled <a>, <button>, <input type=submit>.
  * `.link`: any other <a>.
@@ -237,16 +242,17 @@ textarea:invalid {
   text-decoration: underline 1px var(--color-border-gray);
   text-underline-offset: 0.25em;
 }
-button.link {
-  border: none;
-  padding: 0;
-}
-[name=cancel],
 .auxiliary {
-  border-color: var(--color-border-gray);
+  border-color: var(--color-nav-gray);
   color: var(--color-nav-gray);
   fill: var(--color-nav-gray);
 }
+table .button {
+  border-color: var(--color-border-gray);
+  font-weight: normal;
+  height: 100%;
+  padding: 0.4em;
+}
 .button:focus-visible,
 .tab:focus-visible,
 .tab:hover {
@@ -262,13 +268,6 @@ button.link {
   background-color: var(--color-red);
   border-color: var(--color-red);
 }
-tr:has(select[data-changed]) button[name="button"],
-.set-default-unit:not([disabled]) {
-  background-color: var(--color-purple);
-  border-color: var(--color-purple);
-  color: white;
-  fill: white;
-}
 .link:focus-visible {
   text-decoration-color: var(--color-gray);
 }
@@ -276,13 +275,6 @@ tr:has(select[data-changed]) button[name="button"],
   color: var(--color-blue);
   text-decoration-color: var(--color-blue);
 }
-table .button {
-  border-color: var(--color-border-gray);
-  color: var(--color-table-gray);
-  font-weight: normal;
-  height: 100%;
-  padding: 0.4em;
-}
 
 
 /* NOTE: collapse gaps around empty rows (`topside`) once possible with
@@ -311,6 +303,7 @@ header {
   grid-area: header;
 }
 
+/* TODO: change .navigation -> <nav> ? */
 .navigation {
   display: flex;
   grid-area: nav;
@@ -377,21 +370,21 @@ header {
   line-height: 2.2em;
   pointer-events: auto;
 }
-.flash:before {
+.flash::before {
-  filter: invert(100%);
+  filter: invert(1);
   height: 1.4em;
   margin: 0 0.5em;
   width: 1.4em;
 }
-.flash.alert:before {
+.flash.alert::before {
-  content: url('pictograms/alert-outline.svg');
+  content: url('alert-outline.svg');
 }
 .flash.alert {
   border-color: var(--color-red);
   background-color: var(--color-red);
 }
-.flash.notice:before {
+.flash.notice::before {
-  content: url('pictograms/check-circle-outline.svg');
+  content: url('check-circle-outline.svg');
 }
 .flash.notice {
   border-color: var(--color-blue);
@@ -454,15 +447,18 @@ header {
 
 .tabular-form table {
   border: none;
-  border-spacing: 0.4em 0;
+  border-spacing: 0;
-  margin-inline: -0.4em;
 }
 .tabular-form table td {
   border: none;
+  padding-inline-start: 0.4em;
   vertical-align: middle;
 }
-.tabular-form table td {
+.tabular-form table td:first-child {
-  padding-inline: 0;
+  padding-inline-start: 0;
+}
+.tabular-form table td:last-child {
+  padding-inline-end: 0;
 }
 .tabular-form table :is(form, input, select, textarea):only-child {
   margin-inline-start: 0;
@@ -470,20 +466,27 @@ header {
 
 
 .items-table {
-  border-spacing: 0;
+  border: none;
-  border: 1px solid var(--color-border-gray);
   border-radius: 0.25em;
+  border-spacing: 0;
   font-size: 0.85rem;
   text-align: left;
 }
-.items-table thead {
+.items-table:has(tbody > tr > td) {
-  font-size: 0.8rem;
+  border: 1px solid var(--color-border-gray);
 }
-.items-table thead,
+.items-table:has(tbody > tr > td) caption {
-.items-table tbody tr:hover {
+  display: none;
+}
+.items-table tbody:not(:has(tr > td)){
+  visibility: collapse;
+}
+.items-table th,
+.items-table tr:where(:hover) {
   background-color: var(--color-focus-gray);
 }
 .items-table th {
+  font-size: 0.8rem;
   padding: 0.75em 0 0.75em 1em;
   text-align: center;
 }
@@ -530,7 +533,7 @@ header {
   cursor: grab;
 }
 .items-table .form td {
-  vertical-align: middle;
+  vertical-align: top;
 }
 .items-table td:not(:first-child),
 .grayed {
@@ -567,6 +570,20 @@ header {
 .hmin50 {
   min-width: 50%;
 }
+.hminnumber {
+  min-width: 5em;
+}
+.hmintext {
+  min-width: 6em;
+}
+.hstretch {
+  /* `width` conflicts with <input>/<textarea> size defined by [size]/[cols]
+   * attributes. It's best to not use these attributes (e.g. set them to 1) when
+   * setting width through stylesheet. */
+  /* NOTE: `field-sizing` can be considered after upgrade do FF >=152 */
+  width: -moz-available;
+  width: stretch;
+}
 .italic {
   color: var(--color-gray);
   font-style: italic;
@@ -595,7 +612,7 @@ summary::before {
   background-color: currentColor;
   content: "";
   height: 1em;
-  mask-image: url('pictograms/chevron-down.svg');
+  mask-image: url('chevron-down.svg');
   mask-size: cover;
   width: 1em;
 }
@@ -657,45 +674,3 @@ li::marker {
   min-width: 66%;
   width: max-content;
 }
-.measurements-section {
-  overflow-x: auto;
-}
-body[data-measurements-view=wide] .measurements-compact,
-body[data-measurements-view=compact] .measurements-wide {
-  display: none;
-}
-body[data-measurements-view=compact] .view-toggle[data-view=compact],
-body[data-measurements-view=wide] .view-toggle[data-view=wide] {
-  background-color: var(--color-blue);
-  border-color: var(--color-blue);
-  color: white;
-  fill: white;
-}
-.chart-panel {
-  width: 100%;
-}
-#measurements tr.grouped td {
-  border-top: none;
-}
-#measurements tr.grouped .taken-at,
-#measurements tr.grouped .created-at {
-  visibility: hidden;
-}
-.measurements-wide td {
-  vertical-align: middle;
-  white-space: nowrap;
-}
-.wide-cell {
-  align-items: center;
-  display: inline-flex;
-  gap: 0.25em;
-}
-.wide-cell .button {
-  border: none;
-  font-size: inherit;
-  height: auto;
-  padding: 0;
-}
-.wide-cell button.link::after {
-  content: none;
-}

app/controllers/application_controller.rb

@@ -55,9 +55,9 @@ class ApplicationController < ActionController::Base
 
   private
 
-  def render_no_content(record)
+  def render_errors(record)
-    helpers.render_errors(record)
+    target = record.new_record? ? [:new, record.parent || record.class] : [:edit, record]
-    render html: nil, layout: true
+    render 'errors', assigns: {record: record, target: target}
   end
 
   def rescue_turbo(exception)

app/controllers/charts_controller.rb

@@ -1,12 +0,0 @@
-class ChartsController < ApplicationController
-  def index
-    readouts = current_user.readouts.includes(:quantity, :unit).order(:taken_at, :id)
-    @readouts_json = readouts.map { |r|
-      { takenAt: r.taken_at&.iso8601,
-        quantityId: r.quantity_id,
-        quantityName: r.quantity.name,
-        value: r.value.to_f,
-        unit: r.unit.symbol }
-    }.to_json
-  end
-end

app/controllers/default/units_controller.rb

@@ -17,7 +17,7 @@ class Default::UnitsController < ApplicationController
 
   def import
     @unit.port!(current_user)
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end
@@ -30,14 +30,14 @@ class Default::UnitsController < ApplicationController
 
   def export
     @unit.port!(nil)
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end
 
   def destroy
     @unit.destroy!
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end

app/controllers/measurements_controller.rb

@@ -1,12 +1,7 @@
 class MeasurementsController < ApplicationController
-  before_action :find_readout, only: [:destroy, :edit, :update]
-
-  before_action except: :index do
-    raise AccessForbidden unless current_user.at_least(:active)
-  end
-
   def index
-    load_measurements
+    @measurements = []
+    #@measurements = current_user.units.ordered.includes(:base, :subunits)
   end
 
   def new
@@ -14,49 +9,8 @@ class MeasurementsController < ApplicationController
   end
 
   def create
-    taken_at = params.permit(:taken_at)[:taken_at]
-    readout_params = params.permit(readouts: Readout::ATTRIBUTES).fetch(:readouts, [])
-    @readouts = readout_params.map { |rp| current_user.readouts.build(rp.merge(taken_at: taken_at)) }
-
-    if @readouts.present? && @readouts.all?(&:valid?)
-      ActiveRecord::Base.transaction { @readouts.each(&:save!) }
-      load_measurements
-      flash.now[:notice] = t('.success', count: @readouts.size)
-    else
-      errors = @readouts.flat_map { |r| r.errors.full_messages }
-      flash.now[:alert] = errors.present? ? errors.first : t('.no_readouts')
-    end
-  end
-
-  def edit
-    @user_units = current_user.units.ordered
-  end
-
-  def update
-    if @readout.update(params.require(:readout).permit(:value, :unit_id, :taken_at))
-      load_measurements
-      flash.now[:notice] = t('.success')
-    else
-      @user_units = current_user.units.ordered
-      render :edit
-    end
   end
 
   def destroy
-    @readout.destroy!
-    load_measurements
-    flash.now[:notice] = t('.success')
-  end
-
-  private
-
-  def find_readout
-    @readout = current_user.readouts.find(params[:id])
-  end
-
-  def load_measurements
-    @measurements = current_user.readouts.includes(:quantity, :unit).order(taken_at: :desc, id: :desc)
-    @wide_groups = @measurements.group_by(&:taken_at)
-    @wide_quantities = @measurements.map(&:quantity).uniq.sort_by(&:name)
   end
 end

app/controllers/quantities_controller.rb

@@ -8,10 +8,6 @@ class QuantitiesController < ApplicationController
     raise AccessForbidden unless current_user.at_least(:active)
   end
 
-  before_action only: [:new, :edit, :create, :update] do
-    @user_units = current_user.units.ordered
-  end
-
   def index
     @quantities = current_user.quantities.ordered.includes(:parent, :subquantities)
   end
@@ -23,9 +19,9 @@ class QuantitiesController < ApplicationController
   def create
     @quantity = current_user.quantities.new(quantity_params)
     if @quantity.save
-      @before = @quantity.successive
+      @before = @quantity.succeeding
       @ancestors = @quantity.ancestors
-      flash.now[:notice] = t('.success', quantity: @quantity)
+      flash.now.notice = t('.success', quantity: @quantity)
     else
       render :new
     end
@@ -37,7 +33,7 @@ class QuantitiesController < ApplicationController
   def update
     if @quantity.update(quantity_params.except(:parent_id))
       @ancestors = @quantity.ancestors
-      flash.now[:notice] = t('.success', quantity: @quantity)
+      flash.now.notice = t('.success', quantity: @quantity)
     else
       render :edit
     end
@@ -47,18 +43,22 @@ class QuantitiesController < ApplicationController
     permitted = params.require(:quantity).permit(:parent_id)
     @previous_ancestors = @quantity.ancestors
 
-    # Until UI blocks all disallowed reparents, render error messages if present
+    if @quantity.update(permitted)
-    render_no_content(@quantity) unless @quantity.update(permitted)
-
       @ancestors = @quantity.ancestors
-    @self_and_progenies = @quantity.with_progenies
+      # TODO: simplify into 1 query (see #succeeding comment)
-    @before = @self_and_progenies.last.successive
+      @quantities = @quantity.with_progenies
+      @before = @quantities.last.succeeding
+    else
+      # Until UI blocks all disallowed reparents, render error messages if present.
+      flash.now.alert = @quantity.errors.full_messages
+      render :nothing
+    end
   end
 
   def destroy
     @quantity.destroy!
     @ancestors = @quantity.ancestors
-    flash.now[:notice] = t('.success', quantity: @quantity)
+    flash.now.notice = t('.success', quantity: @quantity)
   end
 
   private

app/controllers/readouts_controller.rb

@@ -6,7 +6,7 @@ class ReadoutsController < ApplicationController
   def new
     @quantities -= @prev_quantities
     # TODO: raise ParameterInvalid if new_quantities.empty?
-    @readouts = current_user.readouts.build(@quantities.map { |q| {quantity: q} })
+    @readouts = @quantities.map { |q| q.readouts.build }
 
     @user_units = current_user.units.ordered
 

app/controllers/units_controller.rb

@@ -1,10 +1,9 @@
 class UnitsController < ApplicationController
-  before_action only: :new do
+  before_action ->{ @unit = current_user.units.find_by!(id: params[:id]) },
-    find_unit if params[:id].present?
+    only: [:new, :edit, :update, :rebase, :destroy],
-  end
+    unless: ->{ action_name == "new" && params[:id].nil? }
-  before_action :find_unit, only: [:edit, :update, :rebase, :destroy]
 
-  before_action except: :index do
+  before_action except: [:index] do
     raise AccessForbidden unless current_user.at_least(:active)
   end
 
@@ -17,12 +16,12 @@ class UnitsController < ApplicationController
   end
 
   def create
-    @unit = current_user.units.new(unit_params)
+    @unit = current_user.units.new(params.expect(Unit::ATTRIBUTES))
     if @unit.save
-      @before = @unit.successive
+      @before = @unit.succeeding
-      flash.now[:notice] = t('.success', unit: @unit)
+      flash.now.notice = t('.success', unit: @unit)
     else
-      render :new
+      render_errors @unit
     end
   end
 
@@ -30,40 +29,32 @@ class UnitsController < ApplicationController
   end
 
   def update
-    if @unit.update(unit_params.except(:base_id))
+    if @unit.update(params.except(:base_id).expect(Unit::ATTRIBUTES))
-      flash.now[:notice] = t('.success', unit: @unit)
+      flash.now.notice = t('.success', unit: @unit)
     else
-      render :edit
+      render_errors @unit
     end
   end
 
   # TODO: Avoid double table width change by first un-hiding table header,
   # then displaying index, e.g. by re-displaying header in index
   def rebase
-    permitted = params.require(:unit).permit(:base_id)
+    unit_params = params.expect(unit: :base_id)
-    permitted.merge!(multiplier: 1) if permitted[:base_id].blank? && @unit.multiplier != 1
+    unit_params.merge!(multiplier: 1.0) if unit_params[:base_id].blank?
 
     @previous_base = @unit.base
-    @unit.update!(permitted)
+    @unit.update!(unit_params)
 
-    @before = @unit.successive
+    @before = @unit.succeeding
     if @unit.multiplier_previously_changed?
-      flash.now[:notice] = t(".multiplier_reset", unit: @unit)
+      flash.now.notice = t(".multiplier_reset", unit: @unit)
     end
   end
 
   def destroy
     @unit.destroy!
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   end
 
   private
-
-  def unit_params
-    params.require(:unit).permit(Unit::ATTRIBUTES)
-  end
-
-  def find_unit
-    @unit = current_user.units.find_by!(id: params[:id])
-  end
 end

app/helpers/application_helper.rb

@@ -40,7 +40,7 @@ module ApplicationHelper
       #   controller.action.* => helpers.label.model.* => activerecord.attributes.model.*
       # First 2 levels are translated recursively.
       label(method, class: classes) do |builder|
-        translation = I18n.config.with(**handler) { deep_translate(method, **options) }
+        translation = I18n.with(**handler) { deep_translate(method, **options) }
         translation.presence || "#{builder.translation}:"
       end
     end
@@ -86,34 +86,30 @@ module ApplicationHelper
     def initialize(...)
       super(...)
       @default_options.merge!(@options.slice(:form))
-      @default_html_options.merge!(@options.slice(:form))
     end
 
     [:text_field, :password_field, :text_area].each do |selector|
       class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
         def #{selector}(method, options = {})
-          options[:maxlength] ||= object.class.type_for_attribute(method).limit
+          options[:maxlength] ||= object.type_for_attribute(method).limit
-          if object.errors.include?(method)
+          # If [cols]/[size] is not set, minimum field width is controlled with
-            options[:pattern] = except_pattern(object.public_send(method), options[:pattern])
+          # stylesheet. To prevent browser estimating missing [cols]/[size]
-          end
+          # based on e.g. [maxlength], set it to 1.
+          options[:#{selector == :text_area ? :cols : :size}] ||= 1
           super
         end
       RUBY_EVAL
     end
 
     def number_field(method, options = {})
-      attr_type = object.type_for_attribute(method)
+      case object.type_for_attribute(method).type
-      case attr_type.type
+      when :float, :double
-      when :decimal
+        options[:min] ||= Float::MIN_15.to_scientific
-        options[:value] = object.public_send(method)&.to_scientific
+        options[:max] ||= Float::MAX_15.to_scientific
-        options[:step] ||= BigDecimal(10).power(-attr_type.scale)
+        options[:oninput] = 'numberValidate(event)'
-        options[:max] ||= BigDecimal(10).power(attr_type.precision - attr_type.scale) -
+        options[:size] ||= options[:class]&.split&.include?('hstretch') ? 1 : 6
-          options[:step]
+        options[:step] ||= :any
-        options[:min] = options[:min] == :step ? options[:step] : options[:min]
+        options[:value] = object.public_send("#{method}_before_type_cast")
-        options[:min] ||= -options[:max]
-        options[:size] ||= attr_type.precision / 2
-      when :float
-        options[:size] ||= 6
       end
       super
     end
@@ -132,11 +128,7 @@ module ApplicationHelper
 
     def submit_default_value
       svg_name = object ? (object.persisted? ? 'update' : 'plus-circle-outline') : ''
-      @template.svg_tag("pictograms/#{svg_name}", super)
+      @template.svg_tag(svg_name, super)
-    end
-
-    def except_pattern(value, pattern = nil)
-      "(?!^#{Regexp.escape(value)}$)" + (pattern || ".*")
     end
   end
 
@@ -147,8 +139,6 @@ module ApplicationHelper
     record_object, options = nil, record_object if record_object.is_a?(Hash)
     extra_options = {builder: TabularFormBuilder, skip_default_ids: true}
     options = merge_attributes(options, extra_options)
-    # TODO: set error message with setCustomValidity instead of rendering to flash?
-    render_errors(record_object || record_name)
     fields_for(record_name, record_object, **options, &block)
   end
 
@@ -161,7 +151,7 @@ module ApplicationHelper
   def svg_tag(source, label = nil, options = {})
     label, options = nil, label if label.is_a? Hash
     svg_tag = tag.svg(**options) do
-      tag.use(href: "#{image_path(source + ".svg")}#icon")
+      tag.use(href: image_path("#{source}.svg") + '#icon')
     end
     label.blank? ? svg_tag : svg_tag + tag.span(label)
   end
@@ -171,14 +161,13 @@ module ApplicationHelper
       ['measurements', 'scale-bathroom', :restricted],
       ['quantities', 'axis-arrow', :restricted, 'right'],
       ['units', 'weight-gram', :restricted],
-      ['charts', 'chart-line', :restricted],
       # TODO: display users tab only if >1 user present; sole_user?/sole_admin?
       ['users', 'account-multiple-outline', :admin],
     ]
 
     menu_tabs.map do |name, image, status, css_class|
       if current_user.at_least(status)
-        link_to svg_tag("pictograms/#{image}", t("#{name}.navigation")),
+        link_to svg_tag(image, t("#{name}.navigation")),
           {controller: "/#{name}", action: "index"},
           class: class_names('tab', css_class, active: name == current_tab)
       end
@@ -210,28 +199,19 @@ module ApplicationHelper
 
   def image_link_to_unless_current(name, image = nil, options = nil, html_options = {})
     name, html_options = link_or_button_options(:link, name, image, html_options)
-    # NOTE: Starting from Rails 8.1.0, below condition can be replaced with:
+    if current_page?(options, method: [:get, :post])
-    #   current_page?(options, method: [:get, :post])
-    if request.path == url_for(options)
       html_options = html_options.deep_merge DISABLED_ATTRIBUTES
     end
     link_to name, options, html_options
   end
 
-  def render_errors(records)
+  def render_flash
-    # Conversion of flash to Array only required because of Devise
-    # TODO: override Devise message setting to Array()?
-    flash[:alert] = Array(flash[:alert])
-    Array(records).each { |record| flash[:alert] += record.errors.full_messages }
-  end
-
-  def render_flash_messages
     flash.map do |entry, messages|
-      # Conversion of flash to Array only required because of Devise
+      # Conversion of flash to Array only required because of Devise.
       Array(messages).map do |message|
         tag.div class: "flash #{entry}" do
           tag.span(sanitize(message)) +
-            svg_tag('pictograms/close-outline', {onclick: "this.parentElement.remove()"})
+            svg_tag('close-outline', {onclick: "this.parentElement.remove()"})
         end
       end
     end.join.html_safe
@@ -263,7 +243,7 @@ module ApplicationHelper
     link_is_local = html_options[:onclick] || html_options.dig(:data, :turbo_stream)
     name = name.to_s
     name += '...' if type == :link && !link_is_local
-    name = svg_tag("pictograms/#{image}", name) if image
+    name = svg_tag(image, name) if image
 
     [name, html_options]
   end

app/javascript/application.js

@@ -1,107 +1,19 @@
 // Configure your import map in config/importmap.rb. Read more:
 // https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
+import "./turbo_actions.js"
+// TODO: access `data-` attributes through
+// `keyname in`/`dataset.keyname`/`delete dataset.keyname`
 
 
-/* Hide page before loaded for testing purposes */
+// Show page if hidden for testing purposes.
 function showPage(event) {
   document.documentElement.style.visibility="visible"
 }
 document.addEventListener('turbo:load', showPage)
 
-function groupMeasurements() {
-  var tbody = document.getElementById('measurements');
-  if (!tbody) return;
-  var prevTakenAt = null;
-  Array.from(tbody.querySelectorAll('tr[data-taken-at]'))
-    .filter(function(row) { return row.style.display !== 'none' })
-    .forEach(function(row) {
-      var takenAt = row.dataset.takenAt;
-      row.classList.toggle('grouped', takenAt !== null && takenAt === prevTakenAt);
-      prevTakenAt = takenAt;
-    });
-}
-
-
-function buildCharts() {
-  var container = document.getElementById('measurements-charts');
-  var dataEl = document.getElementById('charts-data');
-  if (!container || !dataEl) return;
-
-  var readouts = JSON.parse(dataEl.textContent);
-  container.innerHTML = '';
-  if (readouts.length === 0) return;
-
-  // Data arrives sorted by taken_at from the server; group into per-quantity traces
-  var quantities = new Map();
-  readouts.forEach(function(r) {
-    if (!r.takenAt) return;
-    if (!quantities.has(r.quantityId)) {
-      quantities.set(r.quantityId, { name: r.quantityName, unit: r.unit, x: [], y: [] });
-    }
-    var q = quantities.get(r.quantityId);
-    q.x.push(r.takenAt);
-    q.y.push(r.value);
-  });
-
-  var traces = [];
-  quantities.forEach(function(q) {
-    traces.push({
-      x: q.x,
-      y: q.y,
-      mode: 'lines+markers',
-      type: 'scatter',
-      name: q.name + ' (' + q.unit + ')',
-      marker: { size: 5 }
-    });
-  });
-
-  var div = document.createElement('div');
-  div.className = 'chart-panel';
-  container.appendChild(div);
-
-  Plotly.newPlot(div, traces, {
-    xaxis: { type: 'date', tickformat: '%Y-%m-%d %H:%M' },
-    yaxis: {},
-    margin: { t: 20, r: 20, b: 80, l: 60 },
-    paper_bgcolor: 'transparent',
-    plot_bgcolor: 'transparent',
-    font: { family: 'system-ui' },
-    legend: { orientation: 'h', y: -0.25 }
-  }, { responsive: true, displayModeBar: false });
-}
-
-function getMeasurementsView() {
-  return localStorage.getItem('measurements-view') || 'compact';
-}
-
-function applyMeasurementsView(view) {
-  document.body.dataset.measurementsView = view;
-}
-
-function setMeasurementsView(view) {
-  localStorage.setItem('measurements-view', view);
-  applyMeasurementsView(view);
-}
-window.setMeasurementsView = setMeasurementsView
-
-document.addEventListener('turbo:load', function() {
-  if (document.getElementById('charts-data')) {
-    buildCharts();
-    return;
-  }
-  var tbody = document.getElementById('measurements');
-  if (!tbody) return;
-  groupMeasurements();
-  applyMeasurementsView(getMeasurementsView());
-  new MutationObserver(function() {
-    groupMeasurements();
-  }).observe(tbody, {
-    childList: true, subtree: true,
-    attributes: true, attributeFilter: ['style']
-  });
-})
 
+// <details> event handlers.
 function detailsChange(event) {
   var target = event.currentTarget
   var count = target.querySelectorAll('input:checked:not([disabled])').length
@@ -117,7 +29,7 @@ function detailsChange(event) {
 }
 window.detailsChange = detailsChange
 
-/* Close open <details> when focus lost */
+// Close open <details> when focus lost.
 function detailsClose(event) {
   if (!event.relatedTarget ||
       event.relatedTarget.closest("details") != event.currentTarget) {
@@ -131,44 +43,7 @@ window.detailsObserver = new MutationObserver((mutations) => {
 });
 
 
-function readoutUnitChanged(select) {
+// Validation of multiple-submit forms with different field requirements.
-  var button = select.closest('tr').querySelector('.set-default-unit');
-  if (select.value && select.value !== select.dataset.defaultUnitId) {
-    button.removeAttribute('disabled');
-    button.removeAttribute('aria-disabled');
-    button.removeAttribute('tabindex');
-  } else {
-    button.setAttribute('disabled', 'disabled');
-    button.setAttribute('aria-disabled', 'true');
-    button.setAttribute('tabindex', '-1');
-  }
-}
-window.readoutUnitChanged = readoutUnitChanged
-
-function setDefaultUnit(button) {
-  var select = button.closest('tr').querySelector('select[data-default-unit-id]');
-  var form = document.createElement('form');
-  form.action = button.dataset.path;
-  form.method = 'post';
-  form.dataset.turboStream = 'true';
-  var methodInput = document.createElement('input');
-  methodInput.type = 'hidden'; methodInput.name = '_method'; methodInput.value = 'patch';
-  var unitInput = document.createElement('input');
-  unitInput.type = 'hidden'; unitInput.name = 'quantity[default_unit_id]'; unitInput.value = select.value;
-  form.appendChild(methodInput);
-  form.appendChild(unitInput);
-  form.addEventListener('turbo:submit-end', function(event) {
-    if (event.detail.success) {
-      select.dataset.defaultUnitId = select.value;
-      readoutUnitChanged(select);
-    }
-    form.remove();
-  });
-  document.body.appendChild(form);
-  form.requestSubmit();
-}
-window.setDefaultUnit = setDefaultUnit
-
 function formValidate(event) {
   var id = event.submitter.getAttribute("data-validate")
   if (!id) return;
@@ -181,74 +56,35 @@ function formValidate(event) {
 }
 window.formValidate = formValidate
 
+// Pattern for number precision verification. Should accept all number formats
+// accepted by Kernel#Float. Lookahead checks the number of significant digits
+// in mantissa, following expression makes sure there is only one dot.
+const numberRegExp = /^\-?(?=(?:\.?0)*(?:\.?\d){1,15}?(?:\.?0)*\.?(?:[eE]|$))(?<mantissa>\d*\.?\d+|\d+\.)(?:[eE]\-?\d{1,3})?$/
 
-/* Turbo stream actions */
+// Validation of input[type=number] value precision.
-Turbo.StreamElement.prototype.disableElement = function(element) {
+function numberValidate(event) {
-    element.setAttribute("disabled", "disabled")
+  var input = event.target
-    element.setAttribute("aria-disabled", "true")
-    element.setAttribute("tabindex", "-1")
-}
-Turbo.StreamActions.disable = function() {
-  this.targetElements.forEach((e) => { this.disableElement(e) })
-}
 
-Turbo.StreamElement.prototype.enableElement = function(element) {
+  input.setCustomValidity("")
-    element.removeAttribute("disabled")
+  if (!input.validity.valid) return
-    element.removeAttribute("aria-disabled")
-    // Assume 'tabindex' is not used explicitly, so removing it is safe
-    element.removeAttribute("tabindex")
-}
-Turbo.StreamActions.enable = function() {
-  this.targetElements.forEach((e) => { this.enableElement(e) })
-}
 
-/* TODO: change to visibility = collapse to avoid width change? */
+  var match = numberRegExp.exec(input.value)
-Turbo.StreamActions.hide = function() {
+  if (!match ||
-  this.targetElements.forEach((e) => { e.style.display = "none" })
+      (parseFloat(input.value) == 0.0 && match.groups['mantissa'].match(/[1-9]/))) {
-}
+    // TODO: move message to locales
-
+    input.setCustomValidity("Please select a value within range of double precision floating-point format.")
-Turbo.StreamActions.show = function() {
-  this.targetElements.forEach((e) => { e.style.removeProperty("display") })
-}
-
-/*
-Turbo.StreamActions.collapse = function() {
-  this.targetElements.forEach((e) => { e.style.visibility = "collapse" })
-}
-*/
-
-Turbo.StreamActions.close_form = function() {
-  this.targetElements.forEach((e) => {
-    /* Move focus if there's no focus or focus inside form being closed */
-    const focused = document.activeElement
-    if (!focused || (focused == document.body) || e.contains(focused)) {
-      let nextForm = e.parentElement.querySelector(`#${e.id} ~ tr:has([autofocus])`)
-      nextForm ??= e.parentElement.querySelector("tr:has([autofocus])")
-      nextForm?.querySelector("[autofocus]").focus()
   }
-    document.getElementById(e.getAttribute("data-form")).remove()
-    if (e.hasAttribute("data-link")) {
-      this.enableElement(document.getElementById(e.getAttribute("data-link")))
-    }
-    if (e.hasAttribute("data-hidden-row")) {
-      document.getElementById(e.getAttribute("data-hidden-row")).removeAttribute("style")
-    }
-    e.remove()
-  })
 }
+window.numberValidate = numberValidate
 
-Turbo.StreamActions.unselect = function() {
-  this.targetElements.forEach((e) => {
-    e.checked = false
-    this.enableElement(e)
-  })
-}
 
+// Keyboard event processing handlers.
 function formProcessKey(event) {
   switch (event.key) {
     case "Escape":
       event.currentTarget.querySelector("a[name=cancel]").click()
       break
+    // TODO: allow new line inside <textarea> (submit with ctrl-enter?)
     case "Enter":
       event.currentTarget.querySelector("button[name=button]").click()
       event.preventDefault()
@@ -270,7 +106,7 @@ function detailsProcessKey(event) {
       var button = event.currentTarget.querySelector("button:not([disabled])")
       if (button) {
         button.click()
-        // Autofocus won't be respected unless target is blurred
+        // Autofocus won't be respected unless target is blurred.
         event.target.blur()
         event.preventDefault()
         event.stopPropagation()
@@ -280,7 +116,8 @@ function detailsProcessKey(event) {
 }
 window.detailsProcessKey = detailsProcessKey;
 
-/* Items table drag and drop support */
+
+// Items table drag and drop support.
 var lastEnterTime
 function dragStart(event) {
   lastEnterTime = event.timeStamp
@@ -290,7 +127,8 @@ function dragStart(event) {
   })
   event.dataTransfer.setData("text/plain", row.getAttribute("data-drag-path"))
   var rowRectangle = row.getBoundingClientRect()
-  event.dataTransfer.setDragImage(row, event.x - rowRectangle.left, event.y - rowRectangle.top)
+  event.dataTransfer.setDragImage(row, event.x - rowRectangle.left,
+                                  event.y - rowRectangle.top)
   event.dataTransfer.dropEffect = "move"
 }
 window.dragStart = dragStart
@@ -300,9 +138,11 @@ window.dragStart = dragStart
 *   * Enter/Leave events at the same timeStamp may not be logically ordered
 *     (e.g. E -> E -> L, not E -> L -> E),
 *   * not every Enter event has corresponding Leave event, especially during
-*     rapid pointer moves
+*     rapid pointer moves.
 * NOTE: sometimes Leave is not emitted when pointer goes fast over table
 * and outside. This should probably be fixed in browser, than patched here.
+* TODO: replace Leave table with Enter document?
+*   https://www.quirksmode.org/js/events_order.html#link4
 */
 function dragEnter(event) {
   //console.log(event.timeStamp + " " + event.type + ": " + event.currentTarget.id)
@@ -320,7 +160,7 @@ window.dragOver = dragOver
 
 function dragLeave(event) {
   //console.log(event.timeStamp + " " + event.type + ": " + event.currentTarget.id)
-  // Leave has been accounted for by Enter at the same timestamp, processed earlier
+  // Leave has been accounted for by Enter at the same timestamp, processed earlier.
   if (event.timeStamp <= lastEnterTime) return
   event.currentTarget.closest("table").querySelectorAll(".dropzone").forEach((tr) => {
     tr.classList.remove("dropzone")
@@ -338,17 +178,22 @@ window.dragEnd = dragEnd
 
 function drop(event) {
   event.preventDefault()
-  var idParam = event.currentTarget.getAttribute("data-drop-id-param")
+
+  var params = new URLSearchParams()
+  var id_param = event.currentTarget.getAttribute("data-drop-id-param")
   var id = event.currentTarget.getAttribute("data-drop-id").split("_").pop()
-  var form = document.createElement('form');
+  params.append(id_param, id)
-  form.action = event.dataTransfer.getData("text/plain");
+
-  form.method = 'post';
+  fetch(event.dataTransfer.getData("text/plain"), {
-  form.dataset.turboStream = 'true';
+    body: params,
-  var input = document.createElement('input');
+    headers: {
-  input.type = 'hidden'; input.name = idParam; input.value = id;
+      "Accept": "text/vnd.turbo-stream.html",
-  form.appendChild(input);
+      "X-CSRF-Token": document.head.querySelector("meta[name=csrf-token]").content,
-  form.addEventListener('turbo:submit-end', function() { form.remove(); });
+      "X-Requested-With": "XMLHttpRequest"
-  document.body.appendChild(form);
+    },
-  form.requestSubmit();
+    method: "POST"
+  })
+  .then(response => response.text())
+  .then(html => Turbo.renderStreamMessage(html))
 }
 window.drop = drop

app/javascript/turbo_actions.js

@@ -0,0 +1,97 @@
+// Turbo Streams actions.
+
+const FORM_CONTROLS = ["BUTTON", "FIELDSET", "INPUT", "OPTGROUP", "OPTION", "SELECT",
+                       "TEXTAREA"]
+
+Object.assign(Turbo.StreamElement.prototype, {
+  disableElement(element) {
+    if (FORM_CONTROLS.includes(element.tagName)) {
+      element.setAttribute("disabled", "disabled")
+    } else {
+      element.setAttribute("aria-disabled", "true")
+      // NOTE: tabindex should not be disabled?
+      element.setAttribute("tabindex", "-1")
+    }
+  },
+
+  enableElement(element) {
+    if (FORM_CONTROLS.includes(element.tagName)) {
+      element.removeAttribute("disabled")
+    } else {
+      element.removeAttribute("aria-disabled")
+      // Assume 'tabindex' is not used explicitly, so removing it is safe.
+      element.removeAttribute("tabindex")
+    }
+  },
+
+  showElement(element) { element.style.visibility = "visible" }
+})
+
+Object.assign(Turbo.StreamActions, {
+  disable() {
+    this.targetElements.forEach((e) => { this.disableElement(e) })
+  },
+
+  enable() {
+    this.targetElements.forEach((e) => { this.enableElement(e) })
+  },
+
+  hide() {
+    this.targetElements.forEach((e) => { e.style.visibility = "collapse" })
+  },
+
+  show() {
+    this.targetElements.forEach((e) => { this.showElement(e) })
+  },
+
+  unselect() {
+    this.targetElements.forEach((e) => { e.checked = false; this.enableElement(e) })
+  },
+
+  validate_form() {
+    this.targetElements.forEach((form) => {
+      this.templateContent.querySelectorAll("span").forEach((span) => {
+        var control = document.querySelector(
+          `[form="${form.id}"][name="${span.dataset.name}"]`
+        )
+        control.setCustomValidity(span.textContent)
+        // Add event listener in capture phase to clear custom validity before
+        // `[oninput]` or any other bubble phase handler is invoked.
+        //   https://www.quirksmode.org/js/events_order.html
+        // TODO: keep invalidating current value whenever user re-enters it. Store
+        // invalid value and validation message in `[data-invalid-message/value]`
+        // and check input value on "input" event (below) (using `[pattern]` may not
+        // be suitable due to inability to customize validtion message; also
+        // pattern may be used for other, conflicting purposes).
+        // After user executes any other action (while form is open), remove `[data-]`
+        // attributes and custom validation, as value may no longer be invalid.
+        control.addEventListener(
+          "input",
+          function(event) { event.target.setCustomValidity("") },
+          {capture: true, once: true}
+        )
+      })
+      form.reportValidity()
+    })
+  },
+
+  close_form() {
+    this.targetElements.forEach((e) => {
+      // Move focus if there's no focus or focus inside form being closed.
+      const focused = document.activeElement
+      if (!focused || (focused == document.body) || e.contains(focused)) {
+        let nextForm = e.parentElement.querySelector(`#${e.id} ~ tr:has([autofocus])`)
+        nextForm ??= e.parentElement.querySelector("tr:has([autofocus])")
+        nextForm?.querySelector("[autofocus]").focus()
+      }
+      document.getElementById(e.dataset.form).remove()
+      if ('link' in e.dataset) {
+        this.enableElement(document.getElementById(e.dataset.link))
+      }
+      if ('hiddenRow' in e.dataset) {
+        this.showElement(document.getElementById(e.dataset.hiddenRow))
+      }
+      e.remove()
+    })
+  }
+})

app/models/application_record.rb

@@ -1,4 +1,6 @@
 class ApplicationRecord < ActiveRecord::Base
+  include ActionView::Helpers::TagHelper
+
   class << self
     # Cached attribute has non-user assignable value calculated from other
     # attributes' values on create/update. This simplifies and speeds up

app/models/note.rb

@@ -0,0 +1,3 @@
+class Note < ApplicationRecord
+  ATTRIBUTES = [:text]
+end

app/models/quantity.rb

@@ -1,22 +1,26 @@
 class Quantity < ApplicationRecord
-  ATTRIBUTES = [:name, :description, :parent_id, :default_unit_id]
+  ATTRIBUTES = [:name, :description, :parent_id]
   attr_cached :depth, :pathname
 
   belongs_to :user, optional: true
   belongs_to :parent, optional: true, class_name: "Quantity"
-  belongs_to :default_unit, optional: true, class_name: "Unit"
   has_many :subquantities, ->{ order(:name) }, class_name: "Quantity",
     inverse_of: :parent, dependent: :restrict_with_error
+  has_many :readouts, dependent: :restrict_with_error
 
   validate if: ->{ parent.present? } do
     errors.add(:parent, :user_mismatch) unless user_id == parent.user_id
     errors.add(:parent, :self_reference) if id == parent_id
   end
   validate if: ->{ parent.present? }, on: :update do
+    # TODO: should not report error for (parent == self)
     errors.add(:parent, :descendant_reference) if ancestor_of?(parent)
   end
   validates :name, presence: true, uniqueness: {scope: [:user_id, :parent_id]},
     length: {maximum: type_for_attribute(:name).limit}
+  # FIXME: length validation for :text type column is probably wrong; reported
+  # limit is in bytes (at least for MySQL) and check is for #length (i.e.
+  # characters); this doesn't seem to apply to :string (implemented as varchar)
   validates :description, length: {maximum: type_for_attribute(:description).limit}
 
   # Update :depths of progenies after parent change
@@ -61,26 +65,42 @@ class Quantity < ApplicationRecord
   scope :defaults, ->{ where(user: nil) }
 
   # Return: ordered [sub]hierarchy
-  scope :ordered, ->(root: nil, include_root: true) {
+  scope :ordered, ->(**kwargs) {
-    numbered = Arel::Table.new('numbered')
+    with_path(**kwargs).order(arel_table[:path])
+  }
 
-    self.model.with(numbered: numbered(:parent_id, :name)).with_recursive(arel_table.name => [
+  # TODO: sort recursive CTE using ORDER BY; it's supported by SQLite, so
-      numbered.project(
+  # drop MySQL until it is available (?)
-        numbered[Arel.star],
+  # Only ORDER BY allows proper i.e. not placing limits on user data and
-        numbered.cast(numbered[:child_number], 'BINARY').as('path')
+  # efficient with regard to paging (LIMIT/OFFSET) depth-first search.
-      ).where(numbered[root && include_root ? :id : :parent_id].eq(root)),
+  # Sorting based on numbering is less elegant/efficient (MySQL: ROW_NUMBER cannot
-      numbered.project(
+  # be used inside recursive CTE and needs separate SELECT,
-        numbered[Arel.star],
+  # https://bugs.mysql.com/bug.php?id=96538).
-        arel_table[:path].concat(numbered[:child_number])
+  # Sorting based on pathname requires I) padding to maximum column length or
-      ).join(arel_table).on(numbered[:parent_id].eq(arel_table[:id]))
+  # II) delimiter which a) cannot be used in sorted column and b) sorts before
-    ]).order(arel_table[:path])
+  # anything else (this adds complexity; NULL cannot be used when sorting).
+  # Sorting based on ARRAY is only available on PostgreSQL.
+  scope :with_path, ->(root: nil, include_root: true) {
+    with_number = Arel::Table.new('with_number')
+
+    self.model.with(with_number: with_number(:parent_id, :name))
+      .with_recursive(arel_table.name => [
+        with_number.project(
+          with_number[Arel.star],
+          with_number.cast(with_number[:number], 'BINARY').as('path')
+        ).where(with_number[root && include_root ? :id : :parent_id].eq(root)),
+        with_number.project(
+          with_number[Arel.star],
+          arel_table[:path].concat(with_number[:number])
+        ).join(arel_table).on(with_number[:parent_id].eq(arel_table[:id]))
+      ])
   }
 
   # TODO: extract named functions to custom Arel extension
   # NOTE: once recursive queries allow use of window functions, this scope can
   # be merged with :ordered
   # https://gist.github.com/ProGM/c6df08da14708dcc28b5ca325df37ceb#extending-arel
-  scope :numbered, ->(parent_column, order_column) {
+  scope :with_number, ->(parent_column, order_column) {
     select(
       arel_table[Arel.star],
       Arel::Nodes::NamedFunction.new(
@@ -93,12 +113,12 @@ class Quantity < ApplicationRecord
           ).from(arel_table),
           Arel::Nodes.build_quoted('0')
         ],
-      ).as('child_number')
+      ).as('number')
     )
   }
 
   def to_s
-    name
+    tag.pre name
   end
 
   def to_s_with_depth
@@ -131,15 +151,17 @@ class Quantity < ApplicationRecord
       .order(arel_table[:depth].desc)
   }
 
-  # Return: successive record in order of appearance; used for partial view reload
+  # Return: succeeding record in order of appearance, used for partial view reload.
-  def successive
+  # TODO: add scope returning succeeding element for multiple records
+  def succeeding
     quantities = Quantity.arel_table
-    Quantity.with(
+    Quantity.with(lagging_quantities: user.quantities.with_path.select(
-      quantities: user.quantities.ordered.select(
       quantities[Arel.star],
-        Arel::Nodes::NamedFunction.new('LAG', [quantities[:id]]).over.as('lag_id')
+      # For SQLite 'OVER () ORDER BY x' is not equivalent to 'OVER (ORDER BY x)'.
-      )
+      Arel::Nodes::NamedFunction.new('LAG', [quantities[:id]])
-    ).where(quantities[:lag_id].eq(id)).first
+        .over(Arel::Nodes::Window.new.order(Quantity.ordered.order_values)).as('lag_id')
+    )).from(Arel::Table.new(:lagging_quantities).as(:quantities))
+      .where(quantities[:lag_id].eq(id)).take
   end
 
   def with_progenies

app/models/readout.rb

@@ -1,7 +1,9 @@
 class Readout < ApplicationRecord
-  ATTRIBUTES = [:quantity_id, :value, :unit_id, :taken_at]
+  ATTRIBUTES = [:quantity_id, :value, :unit_id]
 
   belongs_to :user
   belongs_to :quantity
   belongs_to :unit
+
+  # TODO: validate quantity.user_id == unit.user_id != NULL
 end

app/models/unit.rb

@@ -1,8 +1,10 @@
 class Unit < ApplicationRecord
-  ATTRIBUTES = [:symbol, :description, :multiplier, :base_id]
+  ATTRIBUTES = {unit: [:symbol, :description, :multiplier, :base_id]}
 
   belongs_to :user, optional: true
   belongs_to :base, optional: true, class_name: "Unit"
+  # TODO: use #alias_attribute after Rails upgrade?
+  alias_method :parent, :base
   has_many :subunits, class_name: "Unit", inverse_of: :base,
     dependent: :restrict_with_error
 
@@ -14,8 +16,8 @@ class Unit < ApplicationRecord
   validates :symbol, presence: true, uniqueness: {scope: :user_id},
     length: {maximum: type_for_attribute(:symbol).limit}
   validates :description, length: {maximum: type_for_attribute(:description).limit}
-  validates :multiplier, numericality: {equal_to: 1}, unless: :base
+  validates :multiplier, numericality: {equal_to: 1.0}, unless: :base
-  validates :multiplier, numericality: {greater_than: 0, precision: true, scale: true}, if: :base
+  validates :multiplier, numericality: {greater_than: 0.0}, if: :base
 
   scope :defaults, ->{ where(user: nil) }
   scope :defaults_diff, ->{
@@ -77,15 +79,13 @@ class Unit < ApplicationRecord
       .from(units).group(:base_id, :symbol)
   }
   scope :ordered, ->{
-    left_outer_joins(:base).order(ordering)
+    left_outer_joins(:base).order([
-  }
+      arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
-
-  def self.ordering
-    [arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
       arel_table[:base_id].not_eq(nil),
-     :multiplier,
+      arel_table[:multiplier],
-     :symbol]
+      arel_table[:symbol]
-  end
+    ])
+  }
 
   before_destroy do
     # TODO: disallow destruction if any object depends on this unit
@@ -93,7 +93,7 @@ class Unit < ApplicationRecord
   end
 
   def to_s
-    symbol
+    tag.pre symbol
   end
 
   def movable?
@@ -104,21 +104,21 @@ class Unit < ApplicationRecord
     user_id.nil?
   end
 
-  # Should only by invoked on Units returned from #defaults_diff which are #portable
+  # Should only by invoked on Units returned from #defaults_diff which are #portable.
   def port!(recipient)
     recipient_base = base && Unit.find_by!(symbol: base.symbol, user: recipient)
-    params = slice(ATTRIBUTES - [:symbol, :base_id])
+    params = slice(ATTRIBUTES[:unit] - [:symbol, :base_id])
     Unit.find_or_initialize_by(user: recipient, symbol: symbol)
       .update!(base: recipient_base, **params)
   end
 
-  def successive
+  def succeeding
     units = Unit.arel_table
-    lead = Arel::Nodes::NamedFunction.new('LAG', [units[:id]])
+    Unit.with(lagging_units: user.units.left_outer_joins(:base).select(
-    window = Arel::Nodes::Window.new.order(*Unit.ordering)
+      units[Arel.star],
-    lag_id = lead.over(window).as('lag_id')
+      Arel::Nodes::NamedFunction.new('LAG', [units[:id]])
-    Unit.with(
+        .over(Arel::Nodes::Window.new.order(Unit.ordered.order_values)).as('lag_id')
-      units: user.units.left_outer_joins(:base).select(units[Arel.star], lag_id)
+    )).from(Arel::Table.new(:lagging_units).as(:units))
-    ).where(units[:lag_id].eq(id)).first
+      .where(units[:lag_id].eq(id)).take
   end
 end

app/views/application/errors.turbo_stream.erb

@@ -0,0 +1,7 @@
+<%= turbo_stream.validate_form dom_target(*@target, :form) do %>
+  <% @record.errors.attribute_names.map do |attr| %>
+    <%= tag.span data: {name: field_name(dom_class(@record), attr)} do %>
+      <%- @record.errors.full_messages_for(attr).map { |m| m + '.' }.join(' ') %>
+    <% end %>
+  <% end %>
+<% end %>

app/views/charts/index.html.erb

@@ -1,2 +0,0 @@
-<div class="main-area" id="measurements-charts"></div>
-<script id="charts-data" type="application/json"><%= raw @readouts_json %></script>

app/views/layouts/application.html.erb

@@ -14,7 +14,6 @@
     <%= csp_meta_tag %>
 
     <%= stylesheet_link_tag "spreadsheet" %>
-    <script src="https://cdn.plot.ly/plotly-basic-2.35.2.min.js"></script>
     <%= javascript_importmap_tags %>
 
     <%#= turbo_page_requires_reload_tag %>
@@ -45,7 +44,7 @@
     </header>
 
     <div id="flashes">
-      <%= render_flash_messages %>
+      <%= render_flash %>
     </div>
 
     <%# Allows overwriting/clearing navigation menu for some views %>

app/views/layouts/application.turbo_stream.erb

@@ -1,6 +1,6 @@
-<%= yield %>
+<%# Render unconditionally, to clear previous flash messages. %>
-
-<%# Some views may convert ActiveRecord errors to flashes, render at the end. %>
 <%= turbo_stream.update :flashes do %>
-  <%= render_flash_messages %>
+  <%= render_flash %>
 <% end %>
+
+<%= yield %>

app/views/measurements/_edit_form.html.erb

@@ -1,24 +0,0 @@
-<%= tabular_fields_for @readout, form: form_tag do |form| %>
-  <%- tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
-    data: {form: form_tag, hidden_row: hidden_row, link: link} do %>
-    <td><%= @readout.quantity %></td>
-    <td class="ralign">
-      <%= form.number_field :value, required: true, autofocus: true %>
-    </td>
-    <td>
-      <%= form.collection_select :unit_id, @user_units, :id,
-        ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
-        {}, required: true %>
-    </td>
-    <td>
-      <%= form.datetime_field :taken_at %>
-    </td>
-    <td></td>
-    <td class="flex">
-      <%= form.button %>
-      <%= image_link_to t(:cancel), "close-outline", measurements_path,
-        class: 'dangerous', name: :cancel,
-        onclick: render_turbo_stream('edit_form_close', {row: row}) %>
-    </td>
-  <% end %>
-<% end %>

app/views/measurements/_edit_form_close.html.erb

@@ -1,2 +0,0 @@
-<%= turbo_stream.close_form row %>
-<%= turbo_stream.update :flashes %>

app/views/measurements/_edit_panel.html.erb

@@ -1,33 +0,0 @@
-<% form_tag = dom_id(@readout, :edit, :form) %>
-<% row = dom_id(@readout, :edit) %>
-<% hidden_row = dom_id(@readout) %>
-
-<%= tabular_form_with model: @readout, url: measurement_path(@readout),
-  id: form_tag do |form| %>
-  <table class="items-table">
-    <tbody>
-      <%= tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
-        data: {form: form_tag, hidden_row: hidden_row} do %>
-        <td><%= @readout.quantity %></td>
-        <td class="ralign">
-          <%= form.number_field :value, required: true, autofocus: true %>
-        </td>
-        <td>
-          <%= form.collection_select :unit_id, @user_units, :id,
-            ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
-            {}, required: true %>
-        </td>
-        <td>
-          <%= form.datetime_field :taken_at %>
-        </td>
-        <td></td>
-        <td class="flex">
-          <%= form.button %>
-          <%= image_link_to t(:cancel), "close-outline", measurements_path,
-            class: 'dangerous', name: :cancel,
-            onclick: render_turbo_stream('edit_form_close', {row: row}) %>
-        </td>
-      <% end %>
-    </tbody>
-  </table>
-<% end %>

app/views/measurements/_form.html.erb

@@ -8,7 +8,7 @@
         <tr class="italic">
           <td class="hexpand hmin50"><%= t '.taken_at_html' %></td>
           <td colspan="3" class="ralign">
-            <%= form.datetime_field :taken_at, required: true, value: Time.current.strftime('%Y-%m-%dT%H:%M') %>
+            <%= form.datetime_field :taken_at, required: true %>
           </td>
         </tr>
       <% end %>
@@ -19,7 +19,8 @@
   <details id="quantity_select" class="center hexpand" open
            onkeydown="detailsProcessKey(event)">
     <summary autofocus>
-      <!-- TODO: Set content with CSS when span empty to avoid duplication -->
+      <%# TODO: Set content with CSS when span empty to avoid duplication; or
+        change to disabled input with prompt %>
       <span data-prompt="<%= t('.select_quantity') %>">
         <%= t('.select_quantity') %>
       </span>
@@ -33,7 +34,7 @@
   <div class="flex reverse">
     <%= form.button id: :create_measurement_button, disabled: true -%>
     <%= image_link_to t(:cancel), "close-outline", measurements_path, name: :cancel,
-      class: 'dangerous', onclick: render_turbo_stream('form_close') %>
+      class: 'auxiliary dangerous', onclick: render_turbo_stream('form_close') %>
   </div>
 <% end %>
 

app/views/measurements/_readout.html.erb

@@ -1,22 +0,0 @@
-<%= tag.tr id: dom_id(readout), data: {taken_at: readout.taken_at&.iso8601,
-  quantity_id: readout.quantity_id, quantity_name: readout.quantity.name,
-  value: format("%.10g", readout.value), unit: readout.unit.symbol} do %>
-  <td>
-    <% if current_user.at_least(:active) %>
-      <%= link_to readout.quantity, edit_measurement_path(readout),
-        class: 'link', onclick: 'this.blur();', data: {turbo_stream: true} %>
-    <% else %>
-      <%= readout.quantity %>
-    <% end %>
-  </td>
-  <td class="ralign"><%= format("%.10g", readout.value) %></td>
-  <td><%= readout.unit %></td>
-  <td class="taken-at"><%= l(readout.taken_at) if readout.taken_at %></td>
-  <td class="created-at"><%= l(readout.created_at) %></td>
-  <% if current_user.at_least(:active) %>
-    <td class="flex">
-      <%= image_button_to t('.destroy'), 'delete-outline', measurement_path(readout),
-        method: :delete, data: {turbo_stream: true} %>
-    </td>
-  <% end %>
-<% end %>

app/views/measurements/_wide_table.html.erb

@@ -1,41 +0,0 @@
-<table class="items-table">
-  <thead>
-    <tr>
-      <th><%= Readout.human_attribute_name(:taken_at) %></th>
-      <% wide_quantities.each do |q| %>
-        <th><%= q.name %></th>
-      <% end %>
-      <th><%= Readout.human_attribute_name(:created_at) %></th>
-    </tr>
-  </thead>
-  <tbody>
-    <% wide_groups.each do |taken_at, readouts| %>
-      <tr>
-        <td><%= l(taken_at) if taken_at %></td>
-        <% wide_quantities.each do |q| %>
-          <% readout = readouts.find { |r| r.quantity_id == q.id } %>
-          <td class="ralign">
-            <% if readout %>
-              <span class="wide-cell">
-                <% if current_user.at_least(:active) %>
-                  <%= link_to format("%.10g", readout.value),
-                    edit_measurement_path(readout, view: :wide),
-                    class: 'link', onclick: 'this.blur();',
-                    data: {turbo_stream: true} %>
-                <% else %>
-                  <%= format("%.10g", readout.value) %>
-                <% end %>
-                &nbsp;<%= readout.unit.symbol %>
-                <% if current_user.at_least(:active) %>
-                  <%= image_button_to '', 'delete-outline', measurement_path(readout),
-                    method: :delete, data: {turbo_stream: true} %>
-                <% end %>
-              </span>
-            <% end %>
-          </td>
-        <% end %>
-        <td><%= l(readouts.first.created_at) %></td>
-      </tr>
-    <% end %>
-  </tbody>
-</table>

app/views/measurements/create.turbo_stream.erb

@@ -1,13 +0,0 @@
-<% if @readouts.present? && @readouts.all?(&:persisted?) %>
-  <%= turbo_stream.update :flashes %>
-  <%= turbo_stream.remove :measurement_form %>
-  <%= turbo_stream.enable :new_measurement_link %>
-  <%= turbo_stream.remove :no_items %>
-  <% @readouts.each do |readout| %>
-    <%= turbo_stream.prepend :measurements, partial: 'readout', locals: {readout: readout} %>
-  <% end %>
-  <%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
-    locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>
-<% else %>
-  <%= turbo_stream.update :flashes %>
-<% end %>

app/views/measurements/destroy.turbo_stream.erb

@@ -1,5 +0,0 @@
-<%= turbo_stream.update :flashes %>
-<%= turbo_stream.remove @readout %>
-<%= turbo_stream.append(:measurements, render_no_items) if current_user.readouts.empty? %>
-<%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
-  locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>

app/views/measurements/edit.turbo_stream.erb

@@ -1,18 +0,0 @@
-<% ids = {row: dom_id(@readout, :edit),
-          hidden_row: dom_id(@readout),
-          link: nil,
-          form_tag: dom_id(@readout, :edit, :form)} %>
-
-<% if params[:view] == 'wide' %>
-  <%= turbo_stream.update :measurement_edit_form, partial: 'edit_panel' %>
-  <%= turbo_stream.hide ids[:hidden_row] %>
-<% else %>
-  <%= turbo_stream.append :measurement_edit_form do %>
-    <%- tabular_form_with model: @readout, url: measurement_path(@readout),
-      html: {id: ids[:form_tag]} do %>
-    <% end %>
-  <% end %>
-  <%= turbo_stream.hide ids[:hidden_row] %>
-  <%= turbo_stream.remove ids[:row] %>
-  <%= turbo_stream.after @readout, partial: 'edit_form', locals: ids -%>
-<% end %>

app/views/measurements/index.html.erb

@@ -5,37 +5,10 @@
       id: :new_measurement_link, onclick: 'this.blur();',
       data: {turbo_stream: true} %>
   <% end %>
-  <%= image_button_tag '', 'view-rows', name: nil, type: 'button',
-    class: 'view-toggle', title: t('.view_compact'),
-    data: {view: 'compact'}, onclick: "setMeasurementsView('compact')" %>
-  <%= image_button_tag '', 'view-columns', name: nil, type: 'button',
-    class: 'view-toggle', title: t('.view_wide'),
-    data: {view: 'wide'}, onclick: "setMeasurementsView('wide')" %>
-
 </div>
 
-<div class="main-area measurements-section">
+<table class="main-area">
-  <%= tag.div id: :measurement_edit_form %>
-  <table class="items-table measurements-compact">
-    <thead>
-      <tr>
-        <th><%= Quantity.model_name.human %></th>
-        <th><%= Readout.human_attribute_name(:value) %></th>
-        <th><%= Unit.model_name.human %></th>
-        <th data-column="taken-at"><%= Readout.human_attribute_name(:taken_at) %></th>
-        <th data-column="created-at"><%= Readout.human_attribute_name(:created_at) %></th>
-        <% if current_user.at_least(:active) %>
-          <th></th>
-        <% end %>
-      </tr>
-    </thead>
   <tbody id="measurements">
-      <%= render(partial: 'readout', collection: @measurements, as: :readout) || render_no_items %>
+    <%= render(@measurements) || render_no_items %>
   </tbody>
-  </table>
+</table>
-
-  <div id="measurements-wide" class="measurements-wide">
-    <%= render 'wide_table', wide_groups: @wide_groups, wide_quantities: @wide_quantities %>
-  </div>
-</div>
-

app/views/measurements/update.turbo_stream.erb

@@ -1,4 +0,0 @@
-<%= turbo_stream.close_form dom_id(@readout, :edit) %>
-<%= turbo_stream.replace @readout, partial: 'measurements/readout', locals: {readout: @readout} %>
-<%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
-  locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>

app/views/quantities/_form.html.erb

@@ -3,22 +3,14 @@
     data: {link: link, form: form_tag, hidden_row: hidden_row} do %>
 
     <td style="--depth:<%= @quantity.depth %>">
-      <%= form.text_field :name, required: true, autofocus: true, size: 20 %>
+      <%= form.text_field :name, autofocus: true, class: 'hstretch', required: true %>
-    </td>
+    <td><%= form.text_area :description, class: 'hstretch', escape: false, rows: 1 %>
-    <td>
-      <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
-    </td>
-    <td>
-      <%= form.collection_select :default_unit_id, @user_units, :id,
-        ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
-        {include_blank: true}, onchange: "this.dataset.changed = ''" %>
-    </td>
 
     <td class="flex">
       <%= form.button %>
-      <%= image_link_to t(:cancel), "close-outline", quantities_path, class: 'dangerous',
+      <%= image_link_to t(:cancel), "close-outline", quantities_path,
-        name: :cancel, onclick: render_turbo_stream('form_close', {row: row}) %>
+        class: 'dangerous', name: :cancel,
-    </td>
+        onclick: render_turbo_stream('form_close', {row: row}) %>
-    <td></td>
+    <td>
   <% end %>
 <% end %>

app/views/quantities/_quantity.html.erb

@@ -1,25 +1,24 @@
-<%= tag.tr id: dom_id(quantity),
+<tr id="<%= dom_target(quantity) %>"
-           ondragstart: "dragStart(event)", ondragend: "dragEnd(event)",
+    ondragstart="dragStart(event)" ondragend="dragEnd(event)"
-           ondragover: "dragOver(event)", ondrop: "drop(event)",
+    ondragover="dragOver(event)" ondrop="drop(event)"
-           ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
+    ondragenter="dragEnter(event)" ondragleave="dragLeave(event)"
-           data: {drag_path: reparent_quantity_path(quantity), drop_id: dom_id(quantity),
+    data-drag-path="<%= reparent_quantity_path(quantity) %>"
-                  drop_id_param: "quantity[parent_id]"} do %>
+    data-drop-id="<%= dom_target(quantity) %>"
+    data-drop-id-param="<%= field_name(:quantity, :parent_id) %>">
 
   <td style="--depth:<%= quantity.depth %>">
     <%= link_to quantity, edit_quantity_path(quantity), class: 'link',
       onclick: 'this.blur();', data: {turbo_stream: true} %>
-  </td>
+  <td><%= quantity.description %>
-  <td><%= quantity.description %></td>
-  <td><%= quantity.default_unit&.symbol %></td>
 
   <% if current_user.at_least(:active) %>
     <td class="flex">
-      <%= image_link_to t('.new_subquantity'), 'plus-outline', new_quantity_path(quantity),
+      <%= image_link_to t('.new_subquantity'), 'plus-outline',
-        id: dom_id(quantity, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+        new_quantity_path(quantity), id: dom_target(:new, quantity, :link),
+        onclick: 'this.blur();', data: {turbo_stream: true} %>
 
       <%= image_button_to_if quantity.destroyable?, t('.destroy'), 'delete-outline',
         quantity_path(quantity), method: :delete %>
-    </td>
+
-    <td class="handle" draggable="true">&#x283F</td>
+    <td class="handle" draggable="true">&#x283F
   <% end %>
-<% end %>

app/views/quantities/create.turbo_stream.erb

@@ -1,7 +1,5 @@
-<%= turbo_stream.close_form dom_id(@quantity.parent || Quantity, :new) %>
+<%= turbo_stream.close_form dom_target(:new, @quantity.parent || :quantity) %>
-<%= turbo_stream.remove :no_items %>
 <% @ancestors.each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
-<%= @before ? turbo_stream.before(@before, @quantity) :
+<%= turbo_stream.before @before || :endmark, @quantity %>
-  turbo_stream.append(:quantities, @quantity) %>

app/views/quantities/destroy.turbo_stream.erb

@@ -2,4 +2,3 @@
   <%= turbo_stream.replace ancestor %>
 <% end %>
 <%= turbo_stream.remove @quantity %>
-<%= turbo_stream.append(:quantities, render_no_items) if current_user.quantities.empty? %>

app/views/quantities/edit.turbo_stream.erb

@@ -1,13 +1,12 @@
-<% ids = {row: dom_id(@quantity, :edit),
+<% ids = {row: dom_target(:edit, @quantity),
-          hidden_row: dom_id(@quantity),
+          hidden_row: dom_target(@quantity),
           link: nil,
-          form_tag: dom_id(@quantity, :edit, :form)} %>
+          form_tag: dom_target(:edit, @quantity, :form)} %>
 
-<%= turbo_stream.append :quantity_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @quantity, html: {id: ids[:form_tag]} do %>
   <% end %>
 <% end %>
 
 <%= turbo_stream.hide ids[:hidden_row] %>
-<%= turbo_stream.remove ids[:row] %>
 <%= turbo_stream.after @quantity, partial: 'form', locals: ids -%>

app/views/quantities/index.html.erb

@@ -1,35 +1,31 @@
 <div class="rightside-area buttongrid">
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.new_quantity'), 'plus-outline', new_quantity_path,
-      id: dom_id(Quantity, :new, :link), onclick: 'this.blur();',
+      id: :new_quantity_link, onclick: 'this.blur();', data: {turbo_stream: true} %>
-      data: {turbo_stream: true} %>
   <% end %>
-  <%#= image_link_to t('.import_quantities'), 'download-outline', default_quantities_path,
+  <%#= image_link_to t('.import_quantities'), 'download-outline',
-    class: 'tools-area' %>
+    default_quantities_path, class: 'tools-area' %>
 </div>
 
-<%# TODO: remove? form can be inserted directly, e.g. at the end of index %>
-<%= tag.div class: 'main-area', id: :quantity_form %>
-
 <table class="main-area items-table">
-  <thead>
+  <caption class="hint"><%= t '.no_items' %></caption>
+
+  <tbody>
     <tr>
-      <th><%= Quantity.human_attribute_name(:name) %></th>
+      <th class="hmintext"><%= Quantity.human_attribute_name(:name) %>
-      <th class="hexpand"><%= Quantity.human_attribute_name(:description) %></th>
+      <th class="hexpand"><%= Quantity.human_attribute_name(:description) %>
-      <th><%= Quantity.human_attribute_name(:default_unit) %></th>
     <% if current_user.at_least(:active) %>
-        <th><%= t :actions %></th>
+      <th><%= t :actions %>
-        <th></th>
+      <th>
+
+    <tr id="quantity_" hidden
+      ondragover="dragOver(event)" ondrop="drop(event)"
+      ondragenter="dragEnter(event)" ondragleave="dragLeave(event)"
+      data-drop-id="quantity_"
+      data-drop-id-param="<%= field_name(:quantity, :parent_id) %>">
+      <th colspan="4"><%= t '.top_level_drop' %>
     <% end %>
-    </tr>
+
-    <%= tag.tr id: "quantity_", hidden: true,
+    <%= render @quantities %>
-               ondragover: "dragOver(event)", ondrop: "drop(event)",
+    <tr id="endmark" hidden>
-               ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-               data: {drop_id: "quantity_", drop_id_param: "quantity[parent_id]"} do %>
-      <th colspan="5"><%= t '.top_level_drop' %></th>
-    <% end %>
-  </thead>
-  <tbody id="quantities">
-    <%= render(@quantities) || render_no_items %>
-  </tbody>
 </table>

app/views/quantities/new.turbo_stream.erb

@@ -1,20 +1,15 @@
-<% dom_obj = @quantity.parent || @quantity %>
+<% target_id = dom_target(:new, @quantity.parent || :quantity) %>
-<% ids = {row: dom_id(dom_obj, :new),
+<% ids = {row: target_id,
           hidden_row: nil,
-          link: dom_id(dom_obj, :new, :link),
+          link: dom_target(target_id, :link),
-          form_tag: dom_id(dom_obj, :new, :form)} %>
+          form_tag: dom_target(target_id, :form)} %>
 
 <%= turbo_stream.disable ids[:link] -%>
 
-<%= turbo_stream.append :quantity_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @quantity, html: {id: ids[:form_tag]} do |form| %>
     <%= form.hidden_field :parent_id if @quantity.parent_id? %>
   <% end %>
 <% end %>
 
-<% if @quantity.parent_id? %>
+<%= turbo_stream.after @quantity.parent || :quantity_, partial: 'form', locals: ids %>
-  <%= turbo_stream.remove ids[:row] %>
-  <%= turbo_stream.after @quantity.parent, partial: 'form', locals: ids %>
-<% else %>
-  <%= turbo_stream.prepend :quantities, partial: 'form', locals: ids %>
-<% end %>

app/views/quantities/reparent.turbo_stream.erb

@@ -1,9 +1,7 @@
-<% @self_and_progenies.each do |q| %>
-  <%= turbo_stream.remove q %>
-<% end %>
 <% @previous_ancestors.union(@ancestors).each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>
-<% @self_and_progenies.each do |q| %>
+<% @quantities.each do |quantity| %>
-  <%= @before ? turbo_stream.before(@before, q) : turbo_stream.append(:quantities, q) %>
+  <%= turbo_stream.remove quantity %>
+  <%= turbo_stream.before @before || :endmark, quantity %>
 <% end %>

app/views/quantities/update.turbo_stream.erb

@@ -1,4 +1,4 @@
-<%= turbo_stream.close_form dom_id(@quantity, :edit) %>
+<%= turbo_stream.close_form dom_target(:edit, @quantity) %>
 <% @ancestors.push(@quantity).each do |ancestor| %>
   <%= turbo_stream.replace ancestor %>
 <% end %>

app/views/readouts/_form.html.erb

@@ -1,6 +1,6 @@
 <%# TODO: add readout reordering by dragging %>
 <%= tabular_fields_for 'readouts[]', readout do |form| %>
-  <%- tag.tr id: dom_id(readout.quantity, :new, :readout) do %>
+  <%- tag.tr id: dom_target(:new, readout.quantity, :readout) do %>
     <td>
       <%# TODO: add grayed readout index (in separate column?) %>
       <%= readout.quantity.relative_pathname(@superquantity) %>
@@ -12,17 +12,10 @@
     <td>
       <%= form.collection_select :unit_id, @user_units, :id,
         ->(u){ sanitize('&emsp;' * (u.base_id ? 1 : 0) + u.symbol) },
-        {prompt: '', disabled: '', selected: readout.quantity.default_unit_id || ''}, required: true,
+        {prompt: '', disabled: '', selected: ''}, required: true %>
-        data: {default_unit_id: readout.quantity.default_unit_id || ''},
-        onchange: "readoutUnitChanged(this)" %>
     </td>
     <td class="flex">
       <%# TODO: change to _link_ after giving up displaying relative paths %>
-      <%= image_button_tag '', 'check-circle-outline',
-        class: 'set-default-unit', name: nil, type: 'button', disabled: true,
-        title: t('readouts.form.set_default_unit'),
-        data: {path: quantity_path(readout.quantity)},
-        onclick: 'setDefaultUnit(this)' %>
       <%= image_button_tag '', 'delete-outline', class: 'dangerous', name: nil,
         formaction: discard_readouts_path(readout.quantity),
         formmethod: :get, formnovalidate: true, data: {turbo_stream: true} %>

app/views/readouts/_form_repath.html.erb

@@ -1,7 +1,7 @@
 <%= turbo_stream.update(:measurement_form_legend) { @superquantity&.pathname } %>
 
 <% @prev_quantities.each do |pq| %>
-  <%= turbo_stream.update dom_id(pq, nil, :pathname) do %>
+  <%= turbo_stream.update dom_target(pq, :pathname) do %>
     <%= pq.relative_pathname(@superquantity) %>
   <% end %>
 <% end %>

app/views/readouts/discard.turbo_stream.erb

@@ -1,4 +1,4 @@
 <%= turbo_stream.disable :create_measurement_button if @prev_quantities.one? %>
-<%= turbo_stream.remove dom_id(@quantity, :new, :readout) %>
+<%= turbo_stream.remove dom_target(:new, @quantity, :readout) %>
 <%= render partial: 'form_repath' %>
-<%= turbo_stream.unselect dom_id(@quantity) %>
+<%= turbo_stream.unselect dom_target(@quantity) %>

app/views/readouts/new.turbo_stream.erb

@@ -1,5 +1,5 @@
 <% @readouts.each do |r| %>
-  <%= turbo_stream.disable dom_id(r.quantity) %>
+  <%= turbo_stream.disable dom_target(r.quantity) %>
 <% end %>
 <%= render partial: 'form_repath' %>
 <%= turbo_stream.append :readouts do %>

app/views/units/_form.html.erb

@@ -3,20 +3,17 @@
     data: {link: link, form: form_tag, hidden_row: hidden_row} do %>
 
     <td style="--depth:<%= @unit.base_id? ? 1 : 0 %>">
-      <%= form.text_field :symbol, required: true, autofocus: true, size: 12 %>
+      <%= form.text_field :symbol, autofocus: true, class: 'hstretch', required: true %>
-    </td>
     <td>
-      <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
+      <% if @unit.base_id? %>
-    </td>
+        <%= form.number_field :multiplier, class: 'hstretch', required: true %>
-    <td>
+      <% end %>
-      <%= form.number_field :multiplier, required: true, size: 10, min: :step if @unit.base_id? %>
+    <td><%= form.text_area :description, class: 'hstretch', escape: false, rows: 1 %>
-    </td>
 
     <td class="flex">
       <%= form.button %>
       <%= image_link_to t(:cancel), "close-outline", units_path, class: 'dangerous',
         name: :cancel, onclick: render_turbo_stream('form_close', {row: row}) %>
-    </td>
+    <td>
-    <td></td>
   <% end %>
 <% end %>

app/views/units/_unit.html.erb

@@ -1,32 +1,32 @@
-<%= tag.tr id: dom_id(unit),
+<tr id="<%= dom_target(unit) %>"
-           ondragstart: "dragStart(event)", ondragend: "dragEnd(event)",
+    ondragstart="dragStart(event)" ondragend="dragEnd(event)"
-           ondragover: "dragOver(event)", ondrop: "drop(event)",
+    ondragover="dragOver(event)" ondrop="drop(event)"
-           ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
+    ondragenter="dragEnter(event)" ondragleave="dragLeave(event)"
-           data: {drag_path: rebase_unit_path(unit),
+    data-drag-path="<%= rebase_unit_path(unit) %>"
-                  drop_id: dom_id(unit.base || unit),
+    data-drop-id="<%= dom_target(unit.base || unit) %>"
-                  drop_id_param: "unit[base_id]"} do %>
+    data-drop-id-param="<%= field_name(:unit, :base_id) %>">
 
   <td style="--depth:<%= unit.base_id? ? 1 : 0 %>">
     <%= link_to unit, edit_unit_path(unit), class: 'link', onclick: 'this.blur();',
       data: {turbo_stream: true} %>
-  </td>
+  <%# Closing <td> tag required to avoid whitespace inclusion for testing. %>
-  <td><%= unit.description %></td>
+  <td class="ralign"><%= unit.multiplier.to_html if unit.base_id? %></td>
-  <td class="ralign"><%= unit.multiplier.to_html %></td>
+  <td><%= unit.description %>
 
   <% if current_user.at_least(:active) %>
     <td class="flex">
       <% unless unit.base_id? %>
         <%= image_link_to t('.new_subunit'), 'plus-outline', new_unit_path(unit),
-          id: dom_id(unit, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+          id: dom_target(:new, unit, :link), onclick: 'this.blur();',
+          data: {turbo_stream: true} %>
       <% end %>
 
-      <%= image_button_to_if unit.movable?, t('.destroy'), 'delete-outline', unit_path(unit),
+      <%= image_button_to_if unit.movable?, t('.destroy'), 'delete-outline',
-        method: :delete %>
+        unit_path(unit), method: :delete %>
-    </td>
+
     <% if unit.movable? %>
-      <td class="handle" draggable="true">&#x283F</td>
+      <td class="handle" draggable="true">&#x283F
     <% else %>
-      <td></td>
+      <td>
     <% end %>
   <% end %>
-<% end %>

app/views/units/create.turbo_stream.erb

@@ -1,4 +1,3 @@
-<%= turbo_stream.close_form dom_id(@unit.base || Unit, :new) %>
+<%= turbo_stream.close_form dom_target(:new, @unit.base || :unit) %>
-<%= turbo_stream.remove :no_items %>
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
-<%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>
+<%= turbo_stream.before @before || :endmark, @unit %>

app/views/units/destroy.turbo_stream.erb

@@ -1,3 +1,2 @@
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
 <%= turbo_stream.remove @unit %>
-<%= turbo_stream.append(:units, render_no_items) if current_user.units.empty? %>

app/views/units/edit.turbo_stream.erb

@@ -1,13 +1,12 @@
-<% ids = {row: dom_id(@unit, :edit),
+<% ids = {row: dom_target(:edit, @unit),
-          hidden_row: dom_id(@unit),
+          hidden_row: dom_target(@unit),
           link: nil,
-          form_tag: dom_id(@unit, :edit, :form)} %>
+          form_tag: dom_target(:edit, @unit, :form)} %>
 
-<%= turbo_stream.append :unit_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @unit, html: {id: ids[:form_tag]} do %>
   <% end %>
 <% end %>
 
 <%= turbo_stream.hide ids[:hidden_row] %>
-<%= turbo_stream.remove ids[:row] %>
 <%= turbo_stream.after @unit, partial: 'form', locals: ids -%>

app/views/units/index.html.erb

@@ -1,34 +1,33 @@
 <div class="rightside-area buttongrid">
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.new_unit'), 'plus-outline', new_unit_path,
-      id: dom_id(Unit, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+      id: :new_unit_link, onclick: 'this.blur();', data: {turbo_stream: true} %>
   <% end %>
   <%= image_link_to t('.import_units'), 'download-outline', default_units_path,
     class: 'tools-area' %>
 </div>
 
-<%# TODO: remove? form can be inserted directly, e.g. at the end of index %>
-<%= tag.div id: :unit_form %>
-
 <table class="main-area items-table">
-  <thead>
+  <caption class="hint"><%= t '.no_items' %></caption>
+
+  <tbody>
     <tr>
-      <th><%= Unit.human_attribute_name(:symbol) %></th>
+      <th class="hmintext"><%= Unit.human_attribute_name(:symbol) %>
-      <th class="hexpand"><%= Unit.human_attribute_name(:description) %></th>
+      <th class="hminnumber"><%= Unit.human_attribute_name(:multiplier) %>
-      <th><%= Unit.human_attribute_name(:multiplier) %></th>
+      <th class="hexpand"><%= Unit.human_attribute_name(:description) %>
     <% if current_user.at_least(:active) %>
-        <th><%= t :actions %></th>
+      <th><%= t :actions %>
-        <th></th>
+      <th>
+
+    <tr id="unit_" hidden
+      ondragover="dragOver(event)" ondrop="drop(event)"
+      ondragenter="dragEnter(event)" ondragleave="dragLeave(event)"
+      data-drop-id="unit_" data-drop-id-param="<%= field_name(:unit, :base_id) %>">
+      <th colspan="5"><%= t '.top_level_drop' %>
     <% end %>
-    </tr>
+
-    <%= tag.tr id: "unit_", hidden: true,
+    <%= render @units %>
-               ondragover: "dragOver(event)", ondrop: "drop(event)",
+    <%# Hidden rows with IDs allow simplier row insertion by using only
-               ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
+      turbo_stream #after/#before instead of #after + #prepend/#before + #append. %>
-               data: {drop_id: "unit_", drop_id_param: "unit[base_id]"} do %>
+    <tr id="endmark" hidden>
-      <th colspan="5"><%= t '.top_level_drop' %></th>
-    <% end %>
-  </thead>
-  <tbody id="units">
-    <%= render(@units) || render_no_items %>
-  </tbody>
 </table>

app/views/units/new.turbo_stream.erb

@@ -1,20 +1,15 @@
-<% dom_obj = @unit.base || @unit %>
+<% target_id = dom_target(:new, @unit.base || :unit) %>
-<% ids = {row: dom_id(dom_obj, :new),
+<% ids = {row: target_id,
           hidden_row: nil,
-          link: dom_id(dom_obj, :new, :link),
+          link: dom_target(target_id, :link),
-          form_tag: dom_id(dom_obj, :new, :form)} %>
+          form_tag: dom_target(target_id, :form)} %>
 
 <%= turbo_stream.disable ids[:link] -%>
 
-<%= turbo_stream.append :unit_form do %>
+<%= turbo_stream.append_all 'body' do %>
   <%- tabular_form_with model: @unit, html: {id: ids[:form_tag]} do |form| %>
     <%= form.hidden_field :base_id if @unit.base_id? %>
   <% end %>
 <% end %>
 
-<% if @unit.base_id? %>
+<%= turbo_stream.after @unit.base || :unit_, partial: 'form', locals: ids %>
-  <%= turbo_stream.remove ids[:row] %>
-  <%= turbo_stream.after @unit.base, partial: 'form', locals: ids %>
-<% else %>
-  <%= turbo_stream.prepend :units, partial: 'form', locals: ids %>
-<% end %>

app/views/units/rebase.turbo_stream.erb

@@ -1,4 +1,5 @@
+<% [@previous_base, @unit.base].uniq.compact.each do |unit| %>
+  <%= turbo_stream.replace unit %>
+<% end %>
 <%= turbo_stream.remove @unit %>
-<%= turbo_stream.replace @previous_base if @previous_base %>
+<%= turbo_stream.before @before || :endmark, @unit %>
-<%= turbo_stream.replace @unit.base if @unit.base_id? && (@previous_base.id != @unit.base_id) %>
-<%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>

app/views/units/update.turbo_stream.erb

@@ -1,3 +1,3 @@
-<%= turbo_stream.close_form dom_id(@unit, :edit) %>
+<%= turbo_stream.close_form dom_target(:edit, @unit) %>
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
 <%= turbo_stream.replace @unit %>

app/views/users/index.html.erb

@@ -4,7 +4,7 @@
       <th><%= User.human_attribute_name(:email) %></th>
       <th><%= User.human_attribute_name(:status) %></th>
       <th><%= User.human_attribute_name(:confirmed_at) %></th>
-      <th><%= User.human_attribute_name(:created_at) %>&nbsp;<sup>(UTC)</sup></th>
+      <th><pre><%= User.human_attribute_name(:created_at) %> <sup>(UTC)</sup></pre></th>
       <th><%= t :actions %></th>
     </tr>
   </thead>
@@ -22,10 +22,8 @@
             <% end %>
           <% end %>
         </td>
-        <td>
+        <td><%= svg_tag 'checkbox-marked-outline' if user.confirmed_at.present? %></td>
-          <%= svg_tag 'pictograms/checkbox-marked-outline' if user.confirmed_at.present? %>
+        <td><pre><%= l user.created_at, format: :without_tz %></pre></td>
-        </td>
-        <td><%= l user.created_at, format: :without_tz %></td>
         <td class="flex">
           <% if allow_disguise?(user) %>
             <%= image_link_to t('.disguise'), 'incognito', disguise_user_path(user) %>

app/views/users/passwords/create.turbo_stream.erb

@@ -1,2 +1 @@
-<%# For some reason flash messages are duplicated in bot flash and flash.now %>
 <% flash.discard %>

app/views/users/profiles/edit.html.erb

@@ -1,5 +1,5 @@
 <% content_for :navigation, flush: true do %>
-  <%= link_to svg_tag('pictograms/arrow-left-bold-outline', t(:back)),
+  <%= link_to svg_tag('arrow-left-bold-outline', t(:back)),
     request.referer.present? ? :back : root_path, class: 'tab' %>
 <% end %>
 

app/views/users/show.html.erb

@@ -1,6 +1,5 @@
 <% content_for :navigation, flush: true do %>
-  <%= link_to svg_tag('pictograms/arrow-left-bold-outline', t(:back)), users_path,
+  <%= link_to svg_tag('arrow-left-bold-outline', t(:back)), users_path, class: 'tab' %>
-    class: 'tab' %>
 <% end %>
 
 <%= labeled_form_for @user, html: {class: 'main-area'} do |f| %>

bin/ci

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+require_relative "../config/boot"
+require "active_support/continuous_integration"
+
+CI = ActiveSupport::ContinuousIntegration
+require_relative "../config/ci.rb"

bin/dev

@@ -0,0 +1,2 @@
+#!/usr/bin/env ruby
+exec "./bin/rails", "server", *ARGV