Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 ruby file: ".ruby-version"
 
-gem "rails", "~> 7.1.2"
+gem "rails", "~> 7.2.2"
 gem "sprockets-rails"
 gem "mysql2", "~> 0.5"
 gem "puma", "~> 6.0"

Gemfile.lock

@@ -1,124 +1,122 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.1.3)
+    actioncable (7.2.2)
-      actionpack (= 7.1.3)
+      actionpack (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.1.3)
+    actionmailbox (7.2.2)
-      actionpack (= 7.1.3)
+      actionpack (= 7.2.2)
-      activejob (= 7.1.3)
+      activejob (= 7.2.2)
-      activerecord (= 7.1.3)
+      activerecord (= 7.2.2)
-      activestorage (= 7.1.3)
+      activestorage (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
-      mail (>= 2.7.1)
+      mail (>= 2.8.0)
-      net-imap
+    actionmailer (7.2.2)
-      net-pop
+      actionpack (= 7.2.2)
-      net-smtp
+      actionview (= 7.2.2)
-    actionmailer (7.1.3)
+      activejob (= 7.2.2)
-      actionpack (= 7.1.3)
+      activesupport (= 7.2.2)
-      actionview (= 7.1.3)
+      mail (>= 2.8.0)
-      activejob (= 7.1.3)
-      activesupport (= 7.1.3)
-      mail (~> 2.5, >= 2.5.4)
-      net-imap
-      net-pop
-      net-smtp
       rails-dom-testing (~> 2.2)
-    actionpack (7.1.3)
+    actionpack (7.2.2)
-      actionview (= 7.1.3)
+      actionview (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       nokogiri (>= 1.8.5)
       racc
-      rack (>= 2.2.4)
+      rack (>= 2.2.4, < 3.2)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    actiontext (7.1.3)
+      useragent (~> 0.16)
-      actionpack (= 7.1.3)
+    actiontext (7.2.2)
-      activerecord (= 7.1.3)
+      actionpack (= 7.2.2)
-      activestorage (= 7.1.3)
+      activerecord (= 7.2.2)
-      activesupport (= 7.1.3)
+      activestorage (= 7.2.2)
+      activesupport (= 7.2.2)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.1.3)
+    actionview (7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       builder (~> 3.1)
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activejob (7.1.3)
+    activejob (7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       globalid (>= 0.3.6)
-    activemodel (7.1.3)
+    activemodel (7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
-    activerecord (7.1.3)
+    activerecord (7.2.2)
-      activemodel (= 7.1.3)
+      activemodel (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       timeout (>= 0.4.0)
-    activestorage (7.1.3)
+    activestorage (7.2.2)
-      actionpack (= 7.1.3)
+      actionpack (= 7.2.2)
-      activejob (= 7.1.3)
+      activejob (= 7.2.2)
-      activerecord (= 7.1.3)
+      activerecord (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
       marcel (~> 1.0)
-    activesupport (7.1.3)
+    activesupport (7.2.2)
       base64
+      benchmark (>= 0.3)
       bigdecimal
-      concurrent-ruby (~> 1.0, >= 1.0.2)
+      concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      logger (>= 1.4.2)
       minitest (>= 5.1)
-      mutex_m
+      securerandom (>= 0.3)
-      tzinfo (~> 2.0)
+      tzinfo (~> 2.0, >= 2.0.5)
-    addressable (2.8.6)
+    addressable (2.8.7)
-      public_suffix (>= 2.0.2, < 6.0)
+      public_suffix (>= 2.0.2, < 7.0)
     base64 (0.2.0)
     bcrypt (3.1.20)
-    bigdecimal (3.1.6)
+    benchmark (0.4.0)
+    bigdecimal (3.1.8)
     bindex (0.8.1)
-    builder (3.2.4)
+    builder (3.3.0)
     byebug (11.1.3)
-    capybara (3.39.2)
+    capybara (3.40.0)
       addressable
       matrix
       mini_mime (>= 0.1.3)
-      nokogiri (~> 1.8)
+      nokogiri (~> 1.11)
       rack (>= 1.6.0)
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    concurrent-ruby (1.2.3)
+    concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     crass (1.0.6)
-    date (3.3.4)
+    date (3.4.1)
-    devise (4.9.3)
+    devise (4.9.4)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
-    drb (2.2.0)
+    drb (2.2.1)
-      ruby2_keywords
+    erubi (1.13.0)
-    erubi (1.12.0)
+    ffi (1.17.0-x86_64-linux-gnu)
-    ffi (1.16.3)
     globalid (1.2.1)
       activesupport (>= 6.1)
-    i18n (1.14.1)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    importmap-rails (2.0.1)
+    importmap-rails (2.0.3)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
-    io-console (0.7.2)
+    io-console (0.8.0)
-    irb (1.11.1)
+    irb (1.14.1)
-      rdoc
+      rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    loofah (2.22.0)
+    logger (1.6.2)
+    loofah (2.23.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mail (2.8.1)
@@ -126,79 +124,77 @@ GEM
       net-imap
       net-pop
       net-smtp
-    marcel (1.0.2)
+    marcel (1.0.4)
     matrix (0.4.2)
     mini_mime (1.1.5)
-    minitest (5.21.2)
+    minitest (5.25.4)
-    mutex_m (0.2.0)
+    mysql2 (0.5.6)
-    mysql2 (0.5.5)
+    net-imap (0.5.1)
-    net-imap (0.4.9.1)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.4.0.1)
+    net-smtp (0.5.0)
       net-protocol
-    nio4r (2.7.0)
+    nio4r (2.7.4)
-    nokogiri (1.16.0-x86_64-linux)
+    nokogiri (1.16.8-x86_64-linux)
       racc (~> 1.4)
     orm_adapter (0.5.0)
-    psych (5.1.2)
+    psych (5.2.1)
+      date
       stringio
-    public_suffix (5.0.4)
+    public_suffix (6.0.1)
-    puma (6.4.2)
+    puma (6.5.0)
       nio4r (~> 2.0)
-    racc (1.7.3)
+    racc (1.8.1)
-    rack (3.0.8)
+    rack (3.1.8)
     rack-session (2.0.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (2.1.0)
+    rackup (2.2.1)
       rack (>= 3)
-      webrick (~> 1.8)
+    rails (7.2.2)
-    rails (7.1.3)
+      actioncable (= 7.2.2)
-      actioncable (= 7.1.3)
+      actionmailbox (= 7.2.2)
-      actionmailbox (= 7.1.3)
+      actionmailer (= 7.2.2)
-      actionmailer (= 7.1.3)
+      actionpack (= 7.2.2)
-      actionpack (= 7.1.3)
+      actiontext (= 7.2.2)
-      actiontext (= 7.1.3)
+      actionview (= 7.2.2)
-      actionview (= 7.1.3)
+      activejob (= 7.2.2)
-      activejob (= 7.1.3)
+      activemodel (= 7.2.2)
-      activemodel (= 7.1.3)
+      activerecord (= 7.2.2)
-      activerecord (= 7.1.3)
+      activestorage (= 7.2.2)
-      activestorage (= 7.1.3)
+      activesupport (= 7.2.2)
-      activesupport (= 7.1.3)
       bundler (>= 1.15.0)
-      railties (= 7.1.3)
+      railties (= 7.2.2)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.6.0)
+    rails-html-sanitizer (1.6.1)
       loofah (~> 2.21)
-      nokogiri (~> 1.14)
+      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 (7.1.3)
+    railties (7.2.2)
-      actionpack (= 7.1.3)
+      actionpack (= 7.2.2)
-      activesupport (= 7.1.3)
+      activesupport (= 7.2.2)
-      irb
+      irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
       thor (~> 1.0, >= 1.2.2)
       zeitwerk (~> 2.6)
-    rake (13.1.0)
+    rake (13.2.1)
-    rdoc (6.6.2)
+    rdoc (6.8.1)
       psych (>= 4.0.0)
-    regexp_parser (2.9.0)
+    regexp_parser (2.9.3)
-    reline (0.4.2)
+    reline (0.5.12)
       io-console (~> 0.5)
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
-    rexml (3.2.6)
+    rexml (3.3.9)
-    ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     sassc (2.4.0)
       ffi (~> 1.9)
@@ -208,27 +204,30 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    selenium-webdriver (4.16.0)
+    securerandom (0.4.0)
+    selenium-webdriver (4.27.0)
+      base64 (~> 0.2)
+      logger (~> 1.4)
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
-    sprockets-rails (3.4.2)
+    sprockets-rails (3.5.2)
-      actionpack (>= 5.2)
+      actionpack (>= 6.1)
-      activesupport (>= 5.2)
+      activesupport (>= 6.1)
       sprockets (>= 3.0.0)
-    stringio (3.1.0)
+    stringio (3.1.2)
-    thor (1.3.0)
+    thor (1.3.2)
-    tilt (2.3.0)
+    tilt (2.4.0)
-    timeout (0.4.1)
+    timeout (0.4.2)
-    turbo-rails (2.0.0.pre.beta.3)
+    turbo-rails (2.0.11)
       actionpack (>= 6.0.0)
-      activejob (>= 6.0.0)
       railties (>= 6.0.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    useragent (0.16.11)
     warden (1.2.9)
       rack (>= 2.0.9)
     web-console (4.2.1)
@@ -236,14 +235,13 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
-    webrick (1.8.1)
+    websocket (1.2.11)
-    websocket (1.2.10)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    zeitwerk (2.6.12)
+    zeitwerk (2.7.1)
 
 PLATFORMS
   x86_64-linux
@@ -255,7 +253,7 @@ DEPENDENCIES
   importmap-rails
   mysql2 (~> 0.5)
   puma (~> 6.0)
-  rails (~> 7.1.2)
+  rails (~> 7.2.2)
   sassc-rails
   selenium-webdriver
   sprockets-rails
@@ -263,5 +261,8 @@ DEPENDENCIES
   tzinfo-data
   web-console
 
+RUBY VERSION
+   ruby 3.3.0p0
+
 BUNDLED WITH
    2.5.3

README.md

@@ -9,8 +9,11 @@ Software requirements
 
 * Server side:
     * Ruby version: developed on Ruby 3.x
-    * database with recursive Common Table Expressions (CTE) support, e.g.
+    * database with:
-      MySQL >= 8.0, MariaDB >= 10.2.2
+        * recursive Common Table Expressions (CTE) support, e.g.
+          MySQL >= 8.0, MariaDB >= 10.2.2
+        * decimal type with precision of at least 30 (not sure if SQLite3
+          supports this)
     * for testing: browser as specified in _Client side_ requirements
 * Client side:
     * browser supporting below requirements (e.g. Firefox >= 121):
@@ -118,3 +121,15 @@ Tests need to be run from within toplevel application directory:
 
         bundle exec rails test test/system/users_test.rb --seed 1234
 
+
+### Icons
+
+Pictogrammers Material Design Icons: https://pictogrammers.com/library/mdi/
+
+
+### Rake tasks
+
+Exporting default settings defined in application to seed file (e.g. to send as
+PR or share between installations):
+
+        bundle exec rails db:seed:export

app/assets/images/pictograms/close-outline.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M3,16.74L7.76,12L3,7.26L7.26,3L12,7.76L16.74,3L21,7.26L16.24,12L21,16.74L16.74,21L12,16.24L7.26,21L3,16.74M12,13.41L16.74,18.16L18.16,16.74L13.41,12L18.16,7.26L16.74,5.84L12,10.59L7.26,5.84L5.84,7.26L10.59,12L5.84,16.74L7.26,18.16L12,13.41Z" /></svg>

app/assets/images/pictograms/download-multiple-outline.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M12 14L19 7H15V1H9V7H5L12 14M12 11.17L9.83 9H11V3H13V9H14.17L12 11.17M5 16V18H19V16H5M5 22V20H19V22H5Z" /></svg>

app/assets/images/pictograms/download-outline.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M13,5V11H14.17L12,13.17L9.83,11H11V5H13M15,3H9V9H5L12,16L19,9H15V3M19,18H5V20H19V18Z" /></svg>

app/assets/images/pictograms/upload-outline.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M9,10V16H15V10H19L12,3L5,10H9M12,5.8L14.2,8H13V14H11V8H9.8L12,5.8M19,18H5V20H19V18Z" /></svg>

app/assets/stylesheets/application.css

@@ -98,16 +98,21 @@ input[type=submit] {
   width: fit-content;
 }
 input:not([type=submit]):not([type=checkbox]),
-select {
+select,
+textarea {
   padding: 0.2em 0.4em;
 }
 .button,
 button,
 input,
-select {
+select,
+textarea {
   border: solid 1px var(--color-gray);
   border-radius: 0.25em;
 }
+textarea {
+  margin: 0
+}
 .button > svg,
 .tab > svg,
 button > svg {
@@ -151,7 +156,8 @@ input[type=checkbox]:checked {
   -webkit-appearance: checkbox;
 }
 input:hover,
-select:hover {
+select:hover,
+textarea:hover {
   border-color: #009ade;
   outline: solid 1px #009ade;
 }
@@ -160,11 +166,13 @@ select:hover {
 }
 input:focus-visible,
 select:focus-within,
-select:focus-visible {
+select:focus-visible,
+textarea:focus-visible {
   accent-color: #006c9b;
   background-color: var(--color-focus-gray);
 }
-input[type=text]:read-only {
+input[type=text]:read-only,
+textarea:read-only {
   border: none;
   padding-left: 0;
   padding-right: 0;
@@ -336,7 +344,7 @@ table.items th,
 table.items td {
   padding-inline: 1em 0;
 }
-table.items td:has(input) {
+table.items td:has(input, textarea) {
   padding-inline-start: calc(0.6em - 0.9px);
 }
 table.items th:last-child {
@@ -367,7 +375,7 @@ table.items td.link a::after {
 table.items td.subunit {
   padding-inline-start: 1.8em;
 }
-table.items td.subunit:has(input) {
+table.items td.subunit:has(input, textarea) {
   padding-inline-start: calc(1.4em - 1px);
 }
 table.items td.actions {
@@ -390,6 +398,9 @@ table.items tr.dropzone::after {
 table.items td.handle {
   cursor: move;
 }
+table.items tr.form td {
+  vertical-align: top;
+}
 
 /* TODO: replace :hover:focus-visible combos with proper LOVE stye order */
 /* TODO: Update styling, including rem removal. */
@@ -410,7 +421,8 @@ table.items td.link a:hover:focus-visible {
   color: #006c9b;
 }
 
-table.items td:not(:first-child) {
+table.items td:not(:first-child),
+.grayed {
   color: var(--color-table-gray);
   fill: var(--color-table-gray);
 }
@@ -439,7 +451,8 @@ table.items input[type=submit] {
 table.items .button:not(:hover),
 table.items button:not(:hover),
 table.items input:not(:hover),
-table.items select:not(:hover) {
+table.items select:not(:hover),
+table.items textarea:not(:hover) {
   border-color: var(--color-border-gray);
 }
 table.items .button:not(:hover),

app/controllers/default/units_controller.rb

@@ -0,0 +1,54 @@
+class Default::UnitsController < ApplicationController
+  navigation_tab :units
+
+  before_action :find_unit, only: :export
+  before_action :find_unit_default, only: [:import, :destroy]
+
+  before_action only: :import do
+    raise AccessForbidden unless current_user.at_least(:active)
+  end
+  before_action except: [:index, :import] do
+    raise AccessForbidden unless current_user.at_least(:admin)
+  end
+
+  def index
+    @units = current_user.units.defaults_diff.includes(:base).ordered
+  end
+
+  def import
+    @unit.port!(current_user)
+    flash.now[:notice] = t('.success', unit: @unit)
+  ensure
+    run_and_render :index
+  end
+
+  #def import_all
+    # From defaults_diff return not only portability, but reason for not being
+    # portable: missing_base and nesting_too_deep. Add portable and
+    # missing_base, if possible in one query
+  #end
+
+  def export
+    @unit.port!(nil)
+    flash.now[:notice] = t('.success', unit: @unit)
+  ensure
+    run_and_render :index
+  end
+
+  def destroy
+    @unit.destroy!
+    flash.now[:notice] = t('.success', unit: @unit)
+  ensure
+    run_and_render :index
+  end
+
+  private
+
+  def find_unit
+    @unit = Unit.find_by!(id: params[:id], user: current_user)
+  end
+
+  def find_unit_default
+    @unit = Unit.find_by!(id: params[:id], user: nil)
+  end
+end

app/controllers/units/defaults_controller.rb

@@ -1,10 +0,0 @@
-class Units::DefaultsController < ApplicationController
-  navigation_tab :units
-
-  before_action except: :index do
-    raise AccessForbidden unless current_user.at_least(:admin)
-  end
-
-  def index
-  end
-end

app/controllers/units_controller.rb

@@ -1,5 +1,5 @@
 class UnitsController < ApplicationController
-  before_action only: [:new] do
+  before_action only: :new do
     find_unit if params[:id].present?
   end
   before_action :find_unit, only: [:edit, :update, :rebase, :destroy]
@@ -9,7 +9,7 @@ class UnitsController < ApplicationController
   end
 
   def index
-    @units = current_user.units.includes(:subunits)
+    @units = current_user.units.includes(:subunits).ordered
   end
 
   def new
@@ -19,7 +19,7 @@ class UnitsController < ApplicationController
   def create
     @unit = current_user.units.new(unit_params)
     if @unit.save
-      flash.now[:notice] = t(".success")
+      flash.now[:notice] = t('.success', unit: @unit)
       run_and_render :index
     else
       render :new
@@ -31,7 +31,7 @@ class UnitsController < ApplicationController
 
   def update
     if @unit.update(unit_params.except(:base_id))
-      flash.now[:notice] = t(".success")
+      flash.now[:notice] = t('.success', unit: @unit)
       run_and_render :index
     else
       render :edit
@@ -40,25 +40,28 @@ class UnitsController < ApplicationController
 
   def rebase
     permitted = params.require(:unit).permit(:base_id)
-    if permitted[:base_id].blank? && @unit.multiplier != 1
+    permitted.merge!(multiplier: 1) if permitted[:base_id].blank? && @unit.multiplier != 1
-      permitted.merge!(multiplier: 1)
-      flash.now[:notice] = t(".multiplier_reset", symbol: @unit.symbol)
-    end
 
-    run_and_render :index if @unit.update(permitted)
+    @unit.update!(permitted)
+
+    if @unit.multiplier_previously_changed?
+      flash.now[:notice] = t(".multiplier_reset", unit: @unit)
+    end
+  ensure
+    run_and_render :index
   end
 
   def destroy
-    if @unit.destroy
+    @unit.destroy!
-      flash.now[:notice] = t(".success")
+    flash.now[:notice] = t('.success', unit: @unit)
-    end
+  ensure
     run_and_render :index
   end
 
   private
 
   def unit_params
-    params.require(:unit).permit(:symbol, :name, :base_id, :multiplier)
+    params.require(:unit).permit(Unit::ATTRIBUTES)
   end
 
   def find_unit

app/controllers/users_controller.rb

@@ -2,12 +2,13 @@ class UsersController < ApplicationController
   helper_method :allow_disguise?
 
   before_action :find_user, only: [:show, :update, :disguise]
-  before_action except: :revert do
+
-    raise AccessForbidden unless current_user.at_least(:admin)
-  end
   before_action only: :revert do
     raise AccessForbidden unless current_user_disguised?
   end
+  before_action except: :revert do
+    raise AccessForbidden unless current_user.at_least(:admin)
+  end
 
   def index
     @users = User.all

app/helpers/application_helper.rb

@@ -84,6 +84,7 @@ module ApplicationHelper
   [:button_to, :link_to, :link_to_unless_current].each do |method_name|
     class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
       def image_#{method_name}(name, image = nil, options = nil, html_options = {}, &block)
+        name = name.to_s
         name = svg_tag("pictograms/\#{image}") + name if image
 
         html_options[:class] = class_names(
@@ -95,6 +96,11 @@ module ApplicationHelper
           html_options[:onclick] = "return confirm('\#{html_options[:onclick][:confirm]}');"
         end
 
+        if __method__.start_with?('image_link_to') &&
+             !(html_options[:onclick] || html_options.dig(:data, :turbo_stream))
+          name = name + '...'
+        end
+
         send :#{method_name}, name, options, html_options, &block
       end
     RUBY_EVAL
@@ -123,27 +129,13 @@ module ApplicationHelper
     "Turbo.renderStreamMessage('#{j(render partial: partial, locals: locals)}'); return false;"
   end
 
-  private
+  def disabled_attributes(disabled)
+    disabled ? {disabled: true, aria: {disabled: true}, tabindex: -1} : {}
+  end
 
-  # Converts value to HTML formatted scientific notation
+  def number_attributes(type)
-  def scientifize(d)
+    step = BigDecimal(10).power(-type.scale)
-    sign, coefficient, base, exponent = d.split
+    max = BigDecimal(10).power(type.precision - type.scale) - step
-    return 'NaN' unless sign
+    {min: -max, max: max, step: step}
-
-    result = (sign == -1 ? '-' : '')
-    unless coefficient == '1' && sign == 1
-      if coefficient.length > 1
-        result += coefficient.insert(1, '.')
-      elsif
-        result += coefficient
-      end
-      if exponent != 1
-        result += "&times;"
-      end
-    end
-    if exponent != 1
-      result += "10<sup>% d</sup>" % [exponent-1]
-    end
-    result.html_safe
   end
 end

app/helpers/default/units_helper.rb

@@ -0,0 +1,2 @@
+module Default::UnitsHelper
+end

app/helpers/units/defaults_helper.rb

@@ -1,2 +0,0 @@
-module Units::DefaultsHelper
-end

app/models/unit.rb

@@ -1,26 +1,83 @@
 class Unit < ApplicationRecord
+  ATTRIBUTES = [:symbol, :description, :multiplier, :base_id]
+
   belongs_to :user, optional: true
   belongs_to :base, optional: true, class_name: "Unit"
-  has_many :subunits, class_name: "Unit", dependent: :restrict_with_error, inverse_of: :base
+  has_many :subunits, class_name: "Unit", inverse_of: :base, dependent: :restrict_with_error
 
   validate if: ->{ base.present? } do
     errors.add(:base, :user_mismatch) unless user == base.user
     errors.add(:base, :multilevel_nesting) if base.base.present?
   end
   validates :symbol, presence: true, uniqueness: {scope: :user_id},
-    length: {maximum: columns_hash['symbol'].limit}
+    length: {maximum: type_for_attribute(:symbol).limit}
-  validates :name, length: {maximum: columns_hash['name'].limit}
+  validates :description, length: {maximum: type_for_attribute(:description).limit}
   validates :multiplier, numericality: {equal_to: 1}, unless: :base
-  validates :multiplier, numericality: {other_than: 0}, if: :base
+  validates :multiplier, numericality: {other_than: 0, precision: true, scale: true}, if: :base
 
   scope :defaults, ->{ where(user: nil) }
+  scope :defaults_diff, ->{
+    actionable_units = Arel::Table.new('actionable_units')
+    units = actionable_units.alias('units')
+    bases_units = arel_table.alias('bases_units')
+    other_units = arel_table.alias('other_units')
+    other_bases_units = arel_table.alias('other_bases_units')
+    sub_units = arel_table.alias('sub_units')
+
+    # TODO: move inner 'with' CTE to outer 'with recursive' - it can have multiple
+    # CTEs, even non recursive ones.
+    Unit.with_recursive(actionable_units: [
+      Unit.with(units: self.or(Unit.defaults)).left_joins(:base)
+        .where.not(
+          # Exclude Units that are/have default counterpart
+          Arel::SelectManager.new.project(1).from(other_units)
+            .outer_join(other_bases_units)
+            .on(other_units[:base_id].eq(other_bases_units[:id]))
+            .where(
+              other_bases_units[:symbol].is_not_distinct_from(bases_units[:symbol])
+                .and(other_units[:symbol].eq(arel_table[:symbol]))
+                .and(other_units[:user_id].is_distinct_from(arel_table[:user_id]))
+            ).exists
+        )
+        .select(
+          arel_table[Arel.star],
+          # Decide if Unit can be im-/exported based on existing hierarchy:
+          # * same base unit symbol has to exist
+          # * unit with subunits can only be ported to root
+          arel_table[:base_id].eq(nil).or(
+            (
+              Arel::SelectManager.new.project(1).from(other_units)
+                .join(sub_units).on(other_units[:id].eq(sub_units[:base_id]))
+                .where(
+                  other_units[:symbol].eq(arel_table[:symbol])
+                    .and(other_units[:user_id].is_distinct_from(arel_table[:user_id]))
+                ).exists.not
+            ).and(
+              Arel::SelectManager.new.project(1).from(other_bases_units)
+                .where(
+                  other_bases_units[:symbol].is_not_distinct_from(bases_units[:symbol])
+                    .and(other_bases_units[:user_id].is_distinct_from(bases_units[:user_id]))
+                ).exists
+            )
+          ).as('portable')
+        ),
+      # Fill base Units to display proper hierarchy. Duplicates will be removed
+      # by final group() - can't be deduplicated with UNION due to 'portable' field.
+      arel_table.join(actionable_units).on(actionable_units[:base_id].eq(arel_table[:id]))
+        .project(arel_table[Arel.star], Arel::Nodes.build_quoted(nil).as('portable'))
+    ]).select(units: [:base_id, :symbol])
+      .select(
+        units[:id].minimum.as('id'), # can be ANY_VALUE()
+        units[:user_id].minimum.as('user_id'), # prefer non-default
+        Arel::Nodes.build_quoted(1).as('multiplier'), # disregard multiplier when sorting
+        units[:portable].minimum.as('portable')
+      )
+      .from(units).group(:base_id, :symbol)
+  }
   scope :ordered, ->{
-    parent_symbol = Arel::Nodes::NamedFunction.new(
-                      'COALESCE',
-                      [Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]]
-                    )
     left_outer_joins(:base)
-      .order(parent_symbol, arel_table[:base_id].asc.nulls_first, :multiplier, :symbol)
+      .order(arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
+             arel_table[:base_id].not_eq(nil), :multiplier, :symbol)
   }
 
   before_destroy do
@@ -28,7 +85,23 @@ class Unit < ApplicationRecord
     nil
   end
 
+  def to_s
+    symbol
+  end
+
   def movable?
     subunits.empty?
   end
+
+  def default?
+    user_id.nil?
+  end
+
+  # 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])
+    Unit.find_or_initialize_by(user: recipient, symbol: symbol)
+      .update!(base: recipient_base, **params)
+  end
 end

app/models/user.rb

@@ -11,7 +11,15 @@ class User < ApplicationRecord
     disabled: 0,    # administratively disallowed to sign in
   }, default: :active
 
-  has_many :units, -> { ordered }, dependent: :destroy
+  has_many :units, dependent: :destroy
+
+  validates :email, presence: true, uniqueness: true,
+    length: {maximum: type_for_attribute(:email).limit}
+  validates :unconfirmed_email, length: {maximum: type_for_attribute(:unconfirmed_email).limit}
+
+  def to_s
+    email
+  end
 
   def at_least(status)
     User.statuses[self.status] >= User.statuses[status]

app/views/default/units/_unit.html.erb

@@ -0,0 +1,23 @@
+<%= tag.tr do %>
+  <td class="<%= class_names({subunit: unit.base, grayed: unit.default?}) %>">
+    <%= unit %>
+  </td>
+
+  <td class="actions">
+    <% unless unit.portable.nil? %>
+      <% if current_user.at_least(:active) && unit.default? %>
+        <%= image_button_to t('.import'), 'download-outline', import_default_unit_path(unit),
+          disabled_attributes(!unit.portable?) %>
+      <% end %>
+      <% if current_user.at_least(:admin) %>
+        <% if unit.default? %>
+          <%= image_button_to t('.delete'), 'delete-outline', default_unit_path(unit),
+            method: :delete %>
+        <% else %>
+          <%= image_button_to t('.export'), 'upload-outline', export_default_unit_path(unit),
+            disabled_attributes(!unit.portable?) %>
+        <% end %>
+      <% end %>
+    <% end %>
+  </td>
+<% end %>

app/views/default/units/index.html.erb

@@ -0,0 +1,22 @@
+<div class="rightside buttongrid">
+  <% if current_user.at_least(:active) %>
+    <%# TODO: implement Import all %>
+    <%#= image_button_to t('.import_all'), 'download-multiple-outline',
+      import_all_default_units_path, data: {turbo_stream: true} %>
+  <% end %>
+  <%= image_link_to t('.back'), 'arrow-left-bold-outline', units_path, class: 'tools' %>
+</div>
+
+<table class="main items">
+  <thead>
+    <tr>
+      <th><%= User.human_attribute_name(:symbol).capitalize %></th>
+      <% if current_user.at_least(:active) %>
+        <th><%= t '.actions' %></th>
+      <% end %>
+    </tr>
+  </thead>
+  <tbody id="units">
+    <%= render(@units) || render_no_items %>
+  </tbody>
+</table>

app/views/default/units/index.turbo_stream.erb

@@ -0,0 +1,3 @@
+<%= turbo_stream.update :units do %>
+  <%= render(@units) || render_no_items  %>
+<% end %>

app/views/layouts/application.html.erb

@@ -29,7 +29,7 @@
       <%= image_link_to t(".issue_tracker"), "bug-outline", issue_tracker_url,
             class: "extendedright" %>
       <% if user_signed_in? %>
-        <%= image_link_to_unless_current(current_user.email, "account-wrench-outline",
+        <%= image_link_to_unless_current(current_user, "account-wrench-outline",
           edit_user_registration_path) {} %>
         <% if current_user_disguised? %>
           <%= image_link_to t(".revert"), "incognito-off", revert_users_path %>

app/views/units/_form.html.erb

@@ -4,24 +4,26 @@
 
     <td class="<%= class_names({subunit: @unit.base}) %>">
       <%= form.text_field :symbol, form: :unit_form, required: true, autofocus: true, size: 12,
-        maxlength: @unit.class.columns_hash['symbol'].limit, autocomplete: "off" %>
+        maxlength: @unit.class.type_for_attribute(:symbol).limit, autocomplete: "off" %>
     </td>
     <td>
-      <%= form.text_field :name, form: :unit_form, size: 30,
+      <%= form.text_area :description, form: :unit_form, cols: 30, rows: 1, escape: false,
-        maxlength: @unit.class.columns_hash['name'].limit, autocomplete: "off" %>
+        maxlength: @unit.class.type_for_attribute(:description).limit, autocomplete: "off" %>
     </td>
     <td>
       <% unless @unit.base.nil? %>
         <%= form.hidden_field :base_id, form: :unit_form %>
-        <%= form.number_field :multiplier, form: :unit_form, required: true, step: "any",
+        <%= form.number_field :multiplier, form: :unit_form, required: true,
-          size: 10, autocomplete: "off" %>
+          size: 10, autocomplete: "off",
+          **number_attributes(@unit.class.type_for_attribute(:multiplier)) %>
       <% end %>
     </td>
 
     <td class="actions">
       <%= form.submit form: :unit_form %>
-      <%= image_link_to t(:cancel), "close-circle-outline", units_path, class: 'dangerous',
+      <%= image_link_to t(:cancel), "close-outline", units_path, class: 'dangerous',
         name: :cancel, onclick: render_turbo_stream('form_close', {link_id: link_id}) %>
     </td>
+    <td></td>
   <% end %>
 <% end %>

app/views/units/_unit.html.erb

@@ -5,21 +5,21 @@
            data: {drag_path: rebase_unit_path(unit), drop_id: dom_id(unit.base || unit)} do %>
 
   <td class="<%= class_names('link', {subunit: unit.base}) %>">
-    <%= link_to unit.symbol, edit_unit_path(unit), id: dom_id(unit, :edit),
+    <%= link_to unit, edit_unit_path(unit), id: dom_id(unit, :edit),
       onclick: 'this.blur();', data: {turbo_stream: true} %>
   </td>
-  <td><%= unit.name %></td>
+  <td><%= unit.description %></td>
-  <td class="number"><%= scientifize(unit.multiplier) %></td>
+  <td class="number"><%= unit.multiplier.to_html %></td>
 
   <% if current_user.at_least(:active) %>
     <td class="actions">
       <% if unit.base.nil? %>
-        <%= image_link_to t(".add_subunit"), "plus-outline", new_unit_path(unit),
+        <%= image_link_to t('.add_subunit'), 'plus-outline', new_unit_path(unit),
           id: dom_id(unit, :add), onclick: 'this.blur();',
           data: {turbo_stream: true} %>
       <% end %>
 
-      <%= image_button_to t(".delete_unit"), "delete-outline", unit_path(unit),
+      <%= image_button_to t('.delete_unit'), 'delete-outline', unit_path(unit),
         method: :delete %>
     </td>
     <% if unit.movable? %>

app/views/units/defaults/index.html.erb

@@ -1,2 +0,0 @@
-<h1>Units::Defaults#index</h1>
-<p>Find me in app/views/units/defaults/index.html.erb</p>

app/views/units/index.html.erb

@@ -2,9 +2,8 @@
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.add_unit'), 'plus-outline', new_unit_path, id: :add_unit,
       onclick: 'this.blur();', data: {turbo_stream: true} %>
-    <%= image_link_to t('.import_units'), 'import', new_unit_path, class: 'tools',
-      data: {turbo_stream: true} %>
   <% end %>
+  <%= image_link_to t('.import_units'), 'download-outline', default_units_path, class: 'tools' %>
 </div>
 
 <%= tag.div id: :unit_form %>
@@ -13,7 +12,7 @@
   <thead>
     <tr>
       <th><%= User.human_attribute_name(:symbol).capitalize %></th>
-      <th><%= User.human_attribute_name(:name).capitalize %></th>
+      <th><%= User.human_attribute_name(:description).capitalize %></th>
       <th><%= User.human_attribute_name(:multiplier).capitalize %></th>
       <% if current_user.at_least(:active) %>
         <th><%= t :actions %></th>

app/views/users/index.html.erb

@@ -11,7 +11,7 @@
   <tbody>
     <% @users.each do |user| %>
       <tr>
-        <td class="link"><%= link_to user.email, user_path(user) %></td>
+        <td class="link"><%= link_to user, user_path(user) %></td>
         <td>
           <% if user == current_user %>
             <%= user.status %>

app/views/users/mailer/password_change.html.erb

@@ -1,3 +1,3 @@
-<p>Hello <%= @resource.email %>!</p>
+<p>Hello <%= @resource %>!</p>
 
 <p>We're contacting you to notify you that your password has been changed.</p>

app/views/users/mailer/reset_password_instructions.html.erb

@@ -1,4 +1,4 @@
-<p>Hello <%= @resource.email %>!</p>
+<p>Hello <%= @resource %>!</p>
 
 <p>Someone has requested a link to change your password. You can do this through the link below.</p>
 

app/views/users/mailer/unlock_instructions.html.erb

@@ -1,4 +1,4 @@
-<p>Hello <%= @resource.email %>!</p>
+<p>Hello <%= @resource %>!</p>
 
 <p>Your account has been locked due to an excessive number of unsuccessful sign in attempts.</p>
 

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

@@ -1,6 +1,6 @@
 <% content_for :navigation, flush: true do %>
-  <%= image_link_to t(:back), 'arrow-left-bold-outline',
+  <%= link_to svg_tag("pictograms/arrow-left-bold-outline") + t(:back),
-    request.referer.present? ? :back : root_path %>
+    request.referer.present? ? :back : root_path, class: 'tab' %>
 <% end %>
 
 <div class="rightside buttongrid">

config/application.rb.dist

@@ -23,6 +23,10 @@ module FixinMe
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 7.0
 
+    # Autoload lib/, required e.g. for core library extensions.
+    # https://guides.rubyonrails.org/autoloading_and_reloading_constants.html#config-autoload-lib-ignore.
+    config.autoload_lib(ignore: %w(assets tasks))
+
     # Configuration for the application, engines, and railties goes here.
     #
     # These settings can be overridden in specific environments using the files
@@ -32,7 +36,7 @@ module FixinMe
     # config.eager_load_paths << Rails.root.join("extras")
 
     config.action_dispatch.rescue_responses['ApplicationController::AccessForbidden'] = :forbidden
-    config.action_dispatch.rescue_responses['ArgumentError'] = :bad_request
+    config.action_dispatch.rescue_responses['ApplicationController::ParameterInvalid'] = :unprocessable_entity
 
     # SETUP: Below settings need to be updated on a per-installation basis.
     #
@@ -47,5 +51,8 @@ module FixinMe
 
     # Email address of admin account
     config.admin = 'admin@localhost'
+
+    # Sender address of account registration-related messages
+    Devise.mailer_sender = 'noreply@localhost'
   end
 end

config/initializers/core_ext.rb

@@ -0,0 +1,9 @@
+require 'core_ext/big_decimal_scientific_notation'
+
+ActiveSupport.on_load :active_record do
+  ActiveModel::Validations::NumericalityValidator.prepend CoreExt::ActiveModel::Validations::NumericalityValidatesPrecisionAndScale
+end
+
+ActiveSupport.on_load :action_dispatch_system_test_case do
+  prepend CoreExt::ActionDispatch::SystemTesting::TestHelpers::ScreenshotHelperUniqueId
+end

config/initializers/devise.rb

@@ -24,7 +24,8 @@ Devise.setup do |config|
   # Configure the e-mail address which will be shown in Devise::Mailer,
   # note that it will be overwritten if you use your own mailer class
   # with default "from" parameter.
-  config.mailer_sender = 'fixinme@noreply.me'
+  # This is set in 'config/application.rb'.
+  #config.mailer_sender = 'fixinme@noreply.me'
 
   # Configure the class responsible to send e-mails.
   # config.mailer = 'Devise::Mailer'

config/initializers/system_test_case.rb

@@ -1,3 +0,0 @@
-ActiveSupport.on_load :action_dispatch_system_test_case do
-  prepend CoreExt::ActionDispatch::SystemTesting::TestHelpers::CustomScreenshotHelperUniqueId
-end

config/locales/en.yml

@@ -1,4 +1,8 @@
 en:
+  errors:
+    messages:
+      precision_exceeded: must not exceed %{value} significant digits
+      scale_exceeded: must not exceed %{value} decimal digits
   activerecord:
     attributes:
       unit:
@@ -33,6 +37,9 @@ en:
         forbidden: >
           You have not been granted access to this action (403 Forbidden).
           This should not happen, please notify site administrator.
+        not_found: >
+          The record that you requested operation on does not exist (404 Not Found).
+          This should not happen, please notify site administrator.
         unprocessable_entity: >
           The request is semantically incorrect and was rejected (422 Unprocessable Entity).
           This should not happen, please notify site administrator.
@@ -54,22 +61,39 @@ en:
       delete_unit: Delete
     index:
       add_unit: Add unit
-      import_units: Import...
+      import_units: Import
-      no_items: There are no configured units. You can try to import some defaults.
+      no_items: There are no configured units. You can Add some or Import from defaults.
       top_level_drop: Drop here to reposition into top-level unit
     new:
       none: none
     create:
-      success: Created new unit
+      success: Created new unit "%{unit}"
     update:
-      success: Updated unit
+      success: Updated unit "%{unit}"
     rebase:
-      multiplier_reset: Multiplier of "%{symbol}" has been reset to 1, due to repositioning
+      multiplier_reset: Multiplier of "%{unit}" has been reset to 1, due to repositioning
     destroy:
-      success: Deleted unit
+      success: Deleted unit "%{unit}"
+  default:
+    units:
+      unit:
+        delete: Delete
+        export: Export
+        import: Import
+      index:
+        actions: Actions on defaults
+        back: Back to units
+        import_all: Import all
+        no_items: There are no differences between default and user units.
+      import:
+        success: Imported unit "%{unit}"
+      export:
+        success: Exported unit "%{unit}"
+      destroy:
+        success: Deleted unit "%{unit}"
   users:
     index:
-      disguise: View as...
+      disguise: View as
     passwords:
       edit:
         new_password: New password

config/routes.rb

@@ -3,22 +3,19 @@ Rails.application.routes.draw do
     controllers: {registrations: :registrations}
 
   resources :units, except: [:show], path_names: {new: '(/:id)/new'} do
-    member do
+    member { post :rebase }
-      post :rebase
-    end
   end
 
-  namespace :units do
+  namespace :default do
-    get 'defaults/index'
+    resources :units, only: [:index, :destroy] do
+      member { post :import, :export }
+      #collection { post :import_all }
+    end
   end
 
   resources :users, only: [:index, :show, :update] do
-    member do
+    member { get :disguise }
-      get :disguise
+    collection { get :revert }
-    end
-    collection do
-      get :revert
-    end
   end
 
   devise_scope :user do

db/migrate/20230602185352_create_units.rb

@@ -2,12 +2,12 @@ class CreateUnits < ActiveRecord::Migration[7.0]
   def change
     create_table :units do |t|
       t.references :user, foreign_key: true
-      t.string :symbol
+      t.string :symbol, null: false, limit: 15
-      t.string :name
+      t.text :description
-      t.decimal :multiplier, precision: 30, scale: 15, default: 1.0
+      t.decimal :multiplier, null: false, precision: 30, scale: 15, default: 1.0
       t.references :base
 
-      t.timestamps
+      t.timestamps null: false
     end
     add_index :units, [:user_id, :symbol], unique: true
   end

db/schema.rb

@@ -10,12 +10,12 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_06_02_185352) do
+ActiveRecord::Schema[7.2].define(version: 2023_06_02_185352) do
   create_table "units", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "user_id"
-    t.string "symbol"
+    t.string "symbol", limit: 15, null: false
-    t.string "name"
+    t.text "description"
-    t.decimal "multiplier", precision: 30, scale: 15, default: "1.0"
+    t.decimal "multiplier", precision: 30, scale: 15, default: "1.0", null: false
     t.bigint "base_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false

db/seeds.rb

@@ -20,19 +20,4 @@ end
 # Formulas will be deleted as dependent on Quantities
 #[Source, Quantity, Unit].each { |model| model.defaults.delete_all }
 
-Unit.transaction do
+require 'seeds/units.rb'
-  Unit.defaults.delete_all
-
-  unit_1 = Unit.create symbol: "1",   name: "dimensionless, one"
-           Unit.create symbol: "%",   base: unit_1, multiplier: 1e-2, name: "percent"
-           Unit.create symbol: "‰",   base: unit_1, multiplier: 1e-3, name: "promille"
-           Unit.create symbol: "‱",   base: unit_1, multiplier: 1e-4, name: "basis point"
-           Unit.create symbol: "ppm", base: unit_1, multiplier: 1e-6, name: "parts per million"
-
-  unit_g = Unit.create symbol: "g",  name: "gram"
-           Unit.create symbol: "ug", base: unit_g, multiplier: 1e-6, name: "microgram"
-           Unit.create symbol: "mg", base: unit_g, multiplier: 1e-3, name: "milligram"
-           Unit.create symbol: "kg", base: unit_g, multiplier: 1e3,  name: "kilogram"
-
-  Unit.create symbol: "kcal", name: "kilocalorie"
-end

db/seeds/templates/units.erb

@@ -0,0 +1,9 @@
+Unit.transaction do
+  Unit.defaults.delete_all
+<% Unit.defaults.ordered.each do |unit| %>
+<%= "\n" if unit.base.nil? %>
+  unit_<%= unit.symbol %> =
+    Unit.create symbol: "<%= unit.symbol %>",<% unless unit.base.nil? %> base: unit_<%= unit.base.symbol %>, multiplier: <%= unit.multiplier.to_scientific %>,<% end %>
+                description: "<%= unit.description %>"
+<% end %>
+end

db/seeds/units.rb

@@ -0,0 +1,36 @@
+Unit.transaction do
+  Unit.defaults.delete_all
+
+  unit_1 =
+    Unit.create symbol: "1",
+                description: "dimensionless, one"
+  unit_ppm =
+    Unit.create symbol: "ppm", base: unit_1, multiplier: 1e-6,
+                description: "parts per million"
+  unit_‱ =
+    Unit.create symbol: "‱", base: unit_1, multiplier: 1e-4,
+                description: "basis point"
+  unit_‰ =
+    Unit.create symbol: "‰", base: unit_1, multiplier: 1e-3,
+                description: "promille"
+  unit_% =
+    Unit.create symbol: "%", base: unit_1, multiplier: 1e-2,
+                description: "percent"
+
+  unit_g =
+    Unit.create symbol: "g",
+                description: "gram"
+  unit_ug =
+    Unit.create symbol: "ug", base: unit_g, multiplier: 1e-6,
+                description: "microgram"
+  unit_mg =
+    Unit.create symbol: "mg", base: unit_g, multiplier: 1e-3,
+                description: "milligram"
+  unit_kg =
+    Unit.create symbol: "kg", base: unit_g, multiplier: 1e3,
+                description: "kilogram"
+
+  unit_kcal =
+    Unit.create symbol: "kcal",
+                description: "kilocalorie"
+end

lib/core_ext/action_dispatch/system_testing/test_helpers/screenshot_helper_unique_id.rb

@@ -1,4 +1,4 @@
-module CoreExt::ActionDispatch::SystemTesting::TestHelpers::CustomScreenshotHelperUniqueId
+module CoreExt::ActionDispatch::SystemTesting::TestHelpers::ScreenshotHelperUniqueId
   private
 
   def unique

lib/core_ext/active_model/validations/numericality_validates_precision_and_scale.rb

@@ -0,0 +1,16 @@
+module CoreExt::ActiveModel::Validations::NumericalityValidatesPrecisionAndScale
+  def validate_each(record, attr_name, value, ...)
+    super(record, attr_name, value, ...)
+
+    if options[:precision] || options[:scale]
+      attr_type = record.class.type_for_attribute(attr_name)
+      value = BigDecimal(value) unless value.is_a? BigDecimal
+      if options[:precision] && (value.precision > attr_type.precision)
+        record.errors.add(attr_name, :precision_exceeded, **filtered_options(attr_type.precision))
+      end
+      if options[:scale] && (value.scale > attr_type.scale)
+        record.errors.add(attr_name, :scale_exceeded, **filtered_options(attr_type.scale))
+      end
+    end
+  end
+end

lib/core_ext/big_decimal_scientific_notation.rb

@@ -0,0 +1,36 @@
+module CoreExt
+  module BigDecimalScientificNotation
+    def to_scientific
+      return 'NaN' unless finite?
+
+      sign, coefficient, base, exponent = split
+      (sign == -1 ? '-' : '') +
+        (coefficient.length > 1 ? coefficient.insert(1, '.') : coefficient) +
+        (exponent != 1 ? "e#{exponent-1}" : '')
+    end
+
+    # Converts value to HTML formatted scientific notation
+    def to_html
+      sign, coefficient, base, exponent = split
+      return 'NaN' unless sign
+
+      result = (sign == -1 ? '-' : '')
+      unless coefficient == '1' && sign == 1
+        if coefficient.length > 1
+          result += coefficient.insert(1, '.')
+        elsif
+          result += coefficient
+        end
+        if exponent != 1
+          result += "×"
+        end
+      end
+      if exponent != 1
+        result += "10<sup>% d</sup>" % [exponent-1]
+      end
+      result.html_safe
+    end
+  end
+end
+
+BigDecimal.prepend CoreExt::BigDecimalScientificNotation

lib/tasks/db.rake

@@ -0,0 +1,12 @@
+namespace :db do
+  namespace :seed do
+    desc "Dump default settings as seed data to db/seeds/*.rb"
+    task export: :environment do
+      seeds_path = Pathname.new(Rails.application.paths["db"].first) / 'seeds'
+      (seeds_path / 'templates').glob('*.erb').each do |template_path|
+        template = ERB.new(template_path.read, trim_mode: '<>')
+        (seeds_path / "#{template_path.basename('.*').to_s}.rb").write(template.result)
+      end
+    end
+  end
+end

test/application_system_test_case.rb

@@ -1,10 +1,13 @@
 require "test_helper"
 
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
+  extend ActionView::Helpers::TranslationHelper
   include ActionView::Helpers::UrlHelper
 
   # NOTE: geckodriver installed with Firefox, ignore incompatibility warning
-  Selenium::WebDriver.logger.ignore(:selenium_manager)
+  Selenium::WebDriver.logger
+    .ignore(:selenium_manager, :clear_session_storage, :clear_local_storage)
+
   Capybara.configure do |config|
     config.save_path = "#{Rails.root}/tmp/screenshots/"
   end
@@ -30,4 +33,18 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   #def assert_stale(element)
   #  assert_raises(Selenium::WebDriver::Error::StaleElementReferenceError) { element.tag_name }
   #end
+
+  # HTML does not allow [disabled] attribute on <a> tag, so it's not possible to
+  # easily find them using e.g. :link selector
+  #Capybara.add_selector(:disabled_link) do
+  #  label "<a> tag with [disabled] attribute"
+  #end
+
+  test "click disabled link" do
+    # Link should be unclickable
+    # assert_raises(Selenium::WebDriver::Error::ElementClickInterceptedError) do
+    #   # Use custom selector for disabled links
+    #   find('a[disabled]').click
+    # end
+  end
 end

test/controllers/default/units_controller_test.rb

@@ -1,6 +1,6 @@
 require "test_helper"
 
-class Units::DefaultsControllerTest < ActionDispatch::IntegrationTest
+class Default::UnitsControllerTest < ActionDispatch::IntegrationTest
   test "should get index" do
     get units_defaults_index_url
     assert_response :success

test/fixtures/units.yml

@@ -1,40 +1,40 @@
 g:
   user: admin
   symbol: g
-  name: gram
+  description: gram
 kg:
   user: admin
   symbol: kg
-  name: kilogram
+  description: kilogram
   multiplier: 1000
   base: g
 1:
   user: admin
   symbol: 1
-  name: one
+  description: one
 s:
   user: admin
   symbol: s
-  name: second
+  description: second
 percent:
   user: admin
   symbol: '%'
-  name: percent
+  description: percent
   multiplier: 0.01
   base: 1
 µg:
   user: admin
   symbol: µg
-  name: microgram
+  description: microgram
   multiplier: 0.000001
   base: g
 mg:
   user: admin
   symbol: mg
-  name: milligram
+  description: milligram
   multiplier: 0.001
   base: g
 g_alice:
   user: alice
   symbol: g
-  name: gram
+  description: gram

test/system/units_test.rb

@@ -1,8 +1,16 @@
 require "application_system_test_case"
 
 class UnitsTest < ApplicationSystemTestCase
+  LINK_LABELS = {
+    add_unit: t('units.index.add_unit'),
+    add_subunit: t('units.unit.add_subunit'),
+    edit: nil
+  }
+
   setup do
     @user = sign_in
+    LINK_LABELS[:edit] = Regexp.union(@user.units.map(&:symbol))
+
     visit units_path
   end
 
@@ -12,7 +20,8 @@ class UnitsTest < ApplicationSystemTestCase
       assert_selector 'tr', count: @user.units.count
     end
 
-    Unit.destroy_all
+    # Cannot #destroy_all due to {dependent: :restrict*} on Unit.subunits association
+    @user.units.delete_all
     visit units_path
     within 'tbody' do
       assert_selector 'tr', count: 1
@@ -20,16 +29,24 @@ class UnitsTest < ApplicationSystemTestCase
     end
   end
 
-  test "add unit" do
+  test "new" do
-    click_on t('units.index.add_unit')
+    type, label = LINK_LABELS.assoc([:add_unit, :add_subunit].sample)
+    add_link = all(:link, exact_text: label).sample
+    add_link.click
+    assert_equal 'disabled', add_link[:disabled]
 
     within 'tbody > tr:has(input[type=text], textarea)' do
       assert_selector ':focus'
-      maxlength = all(:fillable_field).to_h { |f| [f[:name], f[:maxlength].to_i || 1000] }
+
+      maxlength = all(:fillable_field).to_h { |f| [f[:name], f[:maxlength].to_i || 2**16] }
+
       fill_in 'unit[symbol]',
-        with: SecureRandom.random_symbol(rand([1..15, 15..maxlength['unit[symbol]']].sample))
+        with: random_string(rand([1..3, 4..maxlength['unit[symbol]']].sample))
-      fill_in 'unit[name]',
+      fill_in 'unit[description]', with: random_string(rand(0..maxlength['unit[description]']))
-        with: [nil, SecureRandom.alphanumeric(rand(1..maxlength['unit[name]']))].sample
+      within :field, 'unit[multiplier]' do |field|
+        fill_in with: random_number(field[:max], field[:step])
+      end if add_link[:text] != t('units.index.add_unit')
+
       assert_difference ->{ Unit.count }, 1 do
         click_on t('helpers.submit.create')
       end
@@ -39,39 +56,48 @@ class UnitsTest < ApplicationSystemTestCase
       assert_no_selector :fillable_field
       assert_selector 'tr', count: @user.units.count
     end
-    assert_selector '.flash.notice', text: /^#{t('units.create.success')}/
+    assert_no_selector :element, :a, 'disabled': 'disabled',
+      exact_text: Regexp.union(LINK_LABELS.fetch_values(:add_unit, :add_subunit))
+    assert_selector '.flash.notice', text: t('units.create.success', unit: Unit.all.last.symbol)
   end
 
-  test "add and edit disallow opening multiple forms" do
+  # TODO: check proper form/button redisplay and flash messages on add/edit
-    # Once new/edit form is open, other actions on the same page either replace
+  test "new and edit form on validation error" do
-    # the form or leave it untouched
+  end
-    # TODO: add non-empty form closing warning
+
+  # TODO: add non-empty form closing warning
+  test "new and edit disallow opening multiple forms" do
+    # Once new/edit form is open, attempt to open another one will close it
     links = {}
-    link_labels = {1 => [t('units.index.add_unit'), t('units.unit.add_subunit')],
+    targets = {}
-                   0 => units.map(&:symbol)}
+    LINK_LABELS.each_pair do |type, labels|
-    link_labels.each_pair do |row_change, labels|
+      links[type] = all(:link_or_button, exact_text: labels).to_a
-      all(:link_or_button, exact_text: Regexp.union(labels)).map { |l| links[l] = row_change }
+      targets[type] = links[type].sample
     end
-    link, rows = links.assoc(links.keys.sample).tap { |l, _| links.delete(l) }
+    # Define tr count change depending on link clicked
+    row_change = {add_unit: 1, add_subunit: 1, edit: 0}
+
+    type, link = targets.assoc(targets.keys.sample).tap { |t, _| targets.delete(t) }
+    rows = row_change[type]
     assert_difference ->{ all('tbody tr').count }, rows do
       link.click
     end
-    find 'tbody tr:has(input[type=text]:focus)'
+    within('tbody tr:has(input[type=text])') { assert_selector ':focus' }
-
+    if type == :edit
-    # Link should be now unavailable or unclickable
+      assert !link.visible?
-    begin
+      [:add_subunit, :edit].each do |t|
-      assert_raises(Selenium::WebDriver::Error::ElementClickInterceptedError) do
+        assert_difference(->{ links[t].length }, -1) { links[t].select!(&:visible?) }
-        link.click
+      end
-      end if link.visible?
+    else
-    rescue Selenium::WebDriver::Error::StaleElementReferenceError
+      assert link[:disabled]
-      link = nil
     end
 
-    link = links.keys.select(&:visible?).sample
+    targets.merge([:add_subunit, :edit].map { |t| [t, links[t].sample] }.to_h)
-    assert_difference ->{ all('tbody tr').count }, links[link] - rows do
+    type, link = targets.assoc(targets.keys.sample)
+    assert_difference ->{ all('tbody tr').count }, row_change[type] - rows do
       link.click
     end
-    assert_selector 'tbody tr:has(input[type=text]:focus)', count: 1
+    within('tbody tr:has(input[type=text])') { assert_selector ':focus' }
   end
 
   # NOTE: extend with any add/edit link

test/test_helper.rb

@@ -9,15 +9,41 @@ class ActiveSupport::TestCase
   # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
   fixtures :all
 
-  include AbstractController::Translation
   include ActionMailer::TestHelper
+  include ActionView::Helpers::TranslationHelper
 
-  # NOTE: use public #alphanumeric(chars: ...) from Ruby 3.3 onwards
+  # List of categorized Unicode characters:
-  SecureRandom.class_eval do
+  # * http://www.unicode.org/Public/UNIDATA/UnicodeData.txt
-    def self.random_symbol(n = 10)
+  # File format: http://www.unicode.org/L2/L1999/UnicodeData.html
-      # Unicode characters: 32-126, 160-383
+  # Select from graphic ranges: L, M, N, P, S, Zs
-      choose([*' '..'~', 160.chr(Encoding::UTF_8), *'¡'..'ſ'], n)
+  UNICODE_CHARS = {
+    1 => [*"\u0020".."\u007E"],
+    2 => [*"\u00A0".."\u00AC",
+          *"\u00AE".."\u05FF",
+          *"\u0606".."\u061B",
+          *"\u061D".."\u06DC",
+          *"\u06DE".."\u070E",
+          *"\u0710".."\u07FF"]
+  }
+  UNICODE_CHARS.default = UNICODE_CHARS[1] + UNICODE_CHARS[2]
+  def random_string(bytes = 10)
+    result = ''
+    while bytes > 0
+      result += UNICODE_CHARS[bytes].sample.tap { |c| bytes -= c.bytesize }
     end
+    result
+  end
+
+  # Assumes: max >= step and step = 1e[-]N, both as strings
+  def random_number(max, step)
+    max.delete!('.')
+    precision = max.length
+    start = rand(precision) + 1
+    d = (rand(max.to_i) + 1) % 10**start
+    length = rand([0, 1..4, 4..precision].sample)
+    d = d.truncate(-start + length)
+    d = 10**(start - length) if d.zero?
+    BigDecimal(step) * d
   end
 
   def randomize_user_password!(user)
@@ -25,11 +51,11 @@ class ActiveSupport::TestCase
   end
 
   def random_password
-    SecureRandom.alphanumeric rand(Rails.configuration.devise.password_length)
+    Random.alphanumeric rand(Rails.configuration.devise.password_length)
   end
 
   def random_email
-    "%s@%s.%s" % (1..3).map { SecureRandom.alphanumeric(rand(1..20)) }
+    "%s@%s.%s" % (1..3).map { Random.alphanumeric(rand(1..20)) }
   end
 
   def with_last_email