Prevent sole admin from deleting their account

Without this guard, the last admin in the system could delete their own account, making the application unmanageable. This adds a model method `User#sole_admin?`, a controller guard in `RegistrationsController#destroy`, and disables the delete button in the profile edit view when the current user is the only remaining admin. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-01 06:52:14 +00:00
12 changed files with 210 additions and 360 deletions
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -1,74 +0,0 @@
-name: Tests
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-jobs:
-  test-sqlite:
-    name: Tests (SQLite)
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3'
-          bundler-cache: true
-        env:
-          BUNDLE_WITH: "sqlite:development:test"
-
-      - name: Set up test database
-        run: bin/rails db:create db:schema:load
-        env:
-          RAILS_ENV: test
-
-      - name: Run tests
-        run: bin/rails test
-        env:
-          RAILS_ENV: test
-          CI: "true"
-
-  test-mysql:
-    name: Tests (MySQL)
-    runs-on: ubuntu-latest
-
-    services:
-      mysql:
-        image: mysql:8.0
-        env:
-          MYSQL_ROOT_PASSWORD: ""
-          MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
-          MYSQL_DATABASE: fixin_test
-        ports:
-          - 3306:3306
-        options: >-
-          --health-cmd="mysqladmin ping"
-          --health-interval=10s
-          --health-timeout=5s
-          --health-retries=3
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.3'
-          bundler-cache: true
-        env:
-          BUNDLE_WITH: "mysql:development:test"
-
-      - name: Set up test database
-        run: bin/rails db:schema:load
-        env:
-          RAILS_ENV: test
-          DB_ADAPTER: mysql
-
-      - name: Run tests
-        run: bin/rails test
-        env:
-          RAILS_ENV: test
-          CI: "true"
-          DB_ADAPTER: mysql
--- a/app/assets/images/pictograms/alert-outline.svg
+++ b/app/assets/images/pictograms/alert-outline.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M12,2L1,21H23M12,6L19.53,19H4.47M11,10V14H13V10M11,16V18H13V16" /></svg>
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path fill="#ffffff" d="M12,2L1,21H23M12,6L19.53,19H4.47M11,10V14H13V10M11,16V18H13V16" /></svg>
--- a/app/assets/images/pictograms/check-circle-outline.svg
+++ b/app/assets/images/pictograms/check-circle-outline.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M12 2C6.5 2 2 6.5 2 12S6.5 22 12 22 22 17.5 22 12 17.5 2 12 2M12 20C7.59 20 4 16.41 4 12S7.59 4 12 4 20 7.59 20 12 16.41 20 12 20M16.59 7.58L10 14.17L7.41 11.59L6 13L10 17L18 9L16.59 7.58Z" /></svg>
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path fill="#ffffff" d="M12 2C6.5 2 2 6.5 2 12S6.5 22 12 22 22 17.5 22 12 17.5 2 12 2M12 20C7.59 20 4 16.41 4 12S7.59 4 12 4 20 7.59 20 12 16.41 20 12 20M16.59 7.58L10 14.17L7.41 11.59L6 13L10 17L18 9L16.59 7.58Z" /></svg>
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -18,14 +18,10 @@
 /* Strive for simplicity:
 * * style elements/tags only - if possible,
 * * replace element/tag name with class name - if element has to be styled
- * differently depending on context (e.g. <form>; <a> as link/button),
- * * styles with multiple selectors should have all selectors with same
- * specificity, to allow proper rule specificity vs order management.
+ * differently depending on context (e.g. form)
 *
- * NOTE: style in a modular way, similar to how CSS @scope would be used,
- * to make transition easier once @scope is widely available. */
-/* TODO: review styles with multiple selectors and try to convert them to the same
- * specificity. */
+ * NOTE: Style in a modular way, similar to how CSS @scope would be used,
+ * to make transition easier once @scope is widely available */
 :root {
  --color-focus-gray: #f3f3f3;
  --color-border-gray: #dddddd;
@@ -57,26 +53,12 @@
 :focus-visible {
  outline: none;
 }
-/* NOTE: move to higher priority layer instead of using !important? */
-[disabled] {
-  border-color: var(--color-border-gray) !important;
-  color: var(--color-border-gray) !important;
-  /* NOTE: cannot set cursor with `pointer-events: none`; can be fixed by setting
-   * `cursor` on wrapping element.
-  cursor: not-allowed; */
-  fill: var(--color-border-gray) !important;
-  pointer-events: none !important;
-}
-/* [hidden] submit elements cannot have `display` set as it makes them visible. */
-[hidden] {
-  display: none !important;
-}


 /* Color coding of input controls' background:
- *  blue - target for interaction with pointer,
- *  gray - target for interaction with keyboard,
- *  red - destructive, non-undoable action.
+ *  blue - target for interaction with pointer
+ *  gray - target for interaction with keyboard
+ *  red - destructive, non-undoable action
 */
 button,
 details,
@@ -91,17 +73,50 @@ input,
 select {
  text-align: inherit;
 }
+a,
+button,
+input[type=submit] {
+  cursor: pointer;
+  text-decoration: none;
+  white-space: nowrap;
+}
+/* [hidden] submit controls cannot have `display` set as it makes them visible */
+.button,
+button:not([hidden]),
+input[type=submit]:not([hidden]),
+.tab {
+  align-items: center;
+  color: var(--color-gray);
+  display: flex;
+  fill: var(--color-gray);
+  font-weight: bold;
+}
+.button,
+button,
+input[type=submit] {
+  font-size: 0.8rem;
+  padding: 0.6em 0.5em;
+  width: fit-content;
+}
+input:not([type=submit]):not([type=checkbox]),
+select,
+summary,
+textarea {
+  padding: 0.2em 0.4em;
+}
+.button,
+button,
 input,
 select,
 summary,
 textarea {
-  border: 1px solid var(--color-gray);
+  border: solid 1px var(--color-gray);
  border-radius: 0.25em;
-  padding: 0.2em 0.4em;
 }
+input[type=checkbox],
 svg,
 textarea {
-  margin: 0;
+  margin: 0
 }
 input[type=checkbox] {
  accent-color: var(--color-blue);
@@ -109,16 +124,13 @@ input[type=checkbox] {
  -webkit-appearance: none;
  display: flex;
  height: 1.1em;
-  margin: 0;
-  padding: 0;
  width: 1.1em;
 }
 input[type=checkbox]:checked {
  appearance: checkbox;
  -webkit-appearance: checkbox;
 }
-/* Hide spin buttons of <input type=number>. */
-/* TODO: add spin buttons inside <input type=number>: before (-) and after (+) input. */
+/* Hide spin buttons in input number fields */
 input[type=number] {
  appearance: textfield;
  -moz-appearance: textfield;
@@ -130,80 +142,37 @@ input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
 }
+.button > svg,
+.tab > svg,
+button > svg {
+  height: 1.4em;
+  width: 1.4em;
+}
+.button > svg:not(:last-child),
+.tab > svg:not(:last-child),
+button > svg:not(:last-child) {
+  margin-right: 0.2em;
+}
+/* TODO: move normal non-button links (<a>:hover/:focus) styling here (i.e.
+ * page-wide, top-level) and remove from table.items - as the style should be
+ * same everywhere */
+.button:focus-visible,
+button:focus-visible,
+input[type=submit]:focus-visible {
+  background-color: var(--color-focus-gray);
+}
 input:focus-visible,
 select:focus-visible,
 select:focus-within,
-/* TODO: how to achieve `summary:focus-within` for `::details-content`? */
+/* TODO: how to achieve summary:focus-within for ::details-content? */
 summary:focus-visible,
 textarea:focus-visible {
  accent-color: var(--color-dark-blue);
  background-color: var(--color-focus-gray);
 }
-input:hover,
-select:hover,
-summary:hover,
-textarea:hover {
-  border-color: var(--color-blue);
-  outline: 1px solid var(--color-blue);
-}
-select:hover,
-summary:hover {
-  cursor: pointer;
-}
-input:invalid,
-select:invalid,
-textarea:invalid {
-  border-color: var(--color-red);
-  outline-color: var(--color-red);
-}
-
-/* `.button`: button-styled <a>, <button>, <input type=submit>.
- * `.link`: any other <a>.
- * `.tab`: tab-styled <a>.
- */
-.button,
-.link,
-.tab {
-  cursor: pointer;
-  text-decoration: none;
-  white-space: nowrap;
-}
-.button,
-.tab {
-  align-items: center;
-  color: var(--color-gray);
-  display: flex;
-  fill: var(--color-gray);
-  font-weight: bold;
-}
-.button {
-  border: 1px solid var(--color-gray);
-  border-radius: 0.25em;
-  font-size: 0.8rem;
-  padding: 0.6em 0.5em;
-  width: fit-content;
-}
-[name=cancel],
-.auxiliary {
-  border-color: var(--color-border-gray);
-  color: var(--color-nav-gray);
-  fill: var(--color-nav-gray);
-}
-.button > svg,
-.tab > svg {
-  height: 1.4em;
-  width: 1.4em;
-}
-.button > svg:not(:last-child),
-.tab > svg:not(:last-child) {
-  margin-right: 0.2em;
-}
-.button:focus-visible,
-.tab:focus-visible,
-.tab:hover {
-  background-color: var(--color-focus-gray);
-}
-.button:hover {
+.button:hover,
+button:hover,
+input[type=submit]:hover {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
  color: white;
@@ -213,9 +182,23 @@ textarea:invalid {
  background-color: var(--color-red);
  border-color: var(--color-red);
 }
-/* TODO: move normal, non-button links (<a>:hover/:focus) styling here (i.e.
- * page-wide, top-level) and remove from `table.items` - as the style should be
- * same everywhere. */
+input:hover,
+select:hover,
+summary:hover,
+textarea:hover {
+  border-color: var(--color-blue);
+  outline: solid 1px var(--color-blue);
+}
+select:hover,
+summary:hover {
+  cursor: pointer;
+}
+input:invalid,
+select:invalid,
+textarea:invalid {
+  border-color: var(--color-red);
+  outline: solid 1px var(--color-red);
+}
 input[type=text]:read-only,
 textarea:read-only {
  border: none;
@@ -223,8 +206,8 @@ textarea:read-only {
 }


-/* NOTE: collapse gaps around empty rows (`topside`) once possible with
- * `grid-collapse` property and remove alternative `grid-template-areas`.
+/* NOTE: collapse gaps around empty rows (`topside`) once possible
+ * with grid-collapse property and remove alternative grid-template
 * https://github.com/w3c/csswg-drafts/issues/5813 */
 body {
  display: grid;
@@ -257,14 +240,18 @@ header {
  margin-inline-start: 4%;
 }
 .navigation > .tab {
-  border-bottom: 2px solid var(--color-nav-gray);
+  border-bottom: solid 2px var(--color-nav-gray);
  flex: 1;
  font-size: 1rem;
  justify-content: center;
  padding-block: 0.4em;
 }
+.navigation > .tab:hover,
+.navigation > .tab:focus-visible {
+  background-color: var(--color-focus-gray);
+}
 .navigation > .tab.active {
-  border-bottom: 4px solid var(--color-blue);
+  border-bottom: solid 4px var(--color-blue);
  color: var(--color-blue);
  fill: var(--color-blue);
 }
@@ -296,7 +283,7 @@ header {

 #flashes {
  display: grid;
-  row-gap: 0.4em;
+  gap: 0.2em;
  grid-template-columns: 1fr auto auto auto 1fr;
  left: 0;
  pointer-events: none;
@@ -312,17 +299,13 @@ header {
  display: grid;
  grid-column: 2/5;
  grid-template-columns: subgrid;
-  line-height: 2.2em;
  pointer-events: auto;
 }
-.flash:before {
-  filter: invert();
-  height: 1.4em;
-  margin: 0 0.5em;
-  width: 1.4em;
-}
 .flash.alert:before {
  content: url('pictograms/alert-outline.svg');
+  height: 1.4em;
+  margin: 0 0.5em;
+  width: 1.4em;
 }
 .flash.alert {
  border-color: var(--color-red);
@@ -330,24 +313,34 @@ header {
 }
 .flash.notice:before {
  content: url('pictograms/check-circle-outline.svg');
+  height: 1.4em;
+  margin: 0 0.5em;
+  width: 1.4em;
 }
 .flash.notice {
  border-color: var(--color-blue);
  background-color: var(--color-blue);
 }
-.flash svg {
-  cursor: pointer;
-  fill: white;
-  height: 2.2em;
-  opacity: 0.6;
-  padding: 0.4em 0.5em;
-  width: 2.4em;
+.flash > div {
+  grid-column: 2;
 }
-.flash svg:hover {
+/* NOTE: currently flash button inherits some unnecessary styles from generic
+ * button. */
+.flash > button {
+  border: none;
+  color: inherit;
+  cursor: pointer;
+  font-size: 1.4em;
+  font-weight: bold;
+  grid-column: 3;
+  opacity: 0.6;
+  padding: 0.2em 0.4em;
+}
+.flash > button:hover {
  opacity: 1;
 }

-
+/* TODO: Hover over invalid should work like in measurements (thin vs thick border) */
 .labeled-form {
  align-items: center;
  display: grid;
@@ -364,7 +357,7 @@ header {
 .labeled-form label.required {
  font-weight: bold;
 }
-/* Don't style `label.error + input` if case already covered by `input:invalid`. */
+/* Don't style `label.error + input` if case already covered by input:invalid */
 .labeled-form label.error {
  color: var(--color-red);
 }
@@ -378,23 +371,15 @@ header {
 }
 .labeled-form input[type=submit] {
  font-size: 1rem;
-  margin: 1em auto 0 auto;
+  margin: 1.5em auto 0 auto;
  padding: 0.75em;
 }
-.labeled-form .auxiliary {
-  grid-column: 3;
-  /* If more buttons are needed, `grid-row` can be replaced with
-   * `reading-flow: grid-columns` to ensure proper [tabindex] order. */
-  grid-row: 1;
-  height: 100%;
-  padding-block: 0;
-}


-/* TODO: remove `.items` class (?) and make `form table` work properly. */
+/* TODO: remove .items class (?) and make 'form table' work properly */
 table.items {
  border-spacing: 0;
-  border: 1px solid var(--color-border-gray);
+  border: solid 1px var(--color-border-gray);
  border-radius: 0.25em;
  font-size: 0.85rem;
  text-align: left;
@@ -417,7 +402,7 @@ table.items th,
 table.items td {
  padding-inline: 1em 0;
 }
-/* For <a> to fill <td> completely, we use an `::after` pseudoelement. */
+/* For <a> to fill <td> completely, we use an ::after pseudoelement. */
 table.items td.link {
  padding: 0;
  position: relative;
@@ -447,7 +432,7 @@ table.items td:last-child {
  padding-inline-end: 0.1em;
 }
 table.items td {
-  border-top: 1px solid var(--color-border-gray);
+  border-top: solid 1px var(--color-border-gray);
  height: 2.4em;
  padding-block: 0.1em;
 }
@@ -466,7 +451,7 @@ table.items tr.dropzone::after {
  content: '';
  inset: 1px 0 0 0;
  position: absolute;
-  outline: 2px dashed var(--color-blue);
+  outline: dashed 2px var(--color-blue);
  outline-offset: -1px;
  z-index: var(--z-index-table-row-outline);
 }
@@ -477,8 +462,8 @@ table.items tr.form td {
  vertical-align: top;
 }

-/* TODO: replace `:hover:focus-visible` combos with proper LOVE style order. */
-/* TODO: update table styling: simplify selectors, deduplicate, remove non-font rem. */
+/* TODO: replace :hover:focus-visible combos with proper LOVE stye order */
+/* TODO: Update table styling: simplify selectors, deduplicate, remove non-font rem. */
 table.items td.link a:hover,
 table.items td.link a:focus-visible,
 table.items td.link a:hover:focus-visible {
@@ -516,7 +501,9 @@ table.items td.svg {
 table.items td.number {
  text-align: right;
 }
-table.items .button {
+table.items .button,
+table.items button,
+table.items input[type=submit] {
  font-weight: normal;
  height: 100%;
  padding: 0.4em;
@@ -526,26 +513,30 @@ table.items select,
 table.items textarea {
  padding-block: 0.375em;
 }
-
-table input,
-table select,
-table summary,
-table textarea {
+/* TODO: find a way (layers?) to style inputs differently while making sure
+ * hover works properly without using :not(:hover) selectors here. */
+table.items .button:not(:hover),
+table.items button:not(:hover),
+table.items input:not(:hover),
+table.items select:not(:hover),
+table.items textarea:not(:hover) {
  border-color: var(--color-border-gray);
 }
-table select {
+table.items .button:not(:hover),
+table.items button:not(:hover),
+table.items input[type=submit]:not(:hover),
+table.items select:not(:hover) {
  color: var(--color-table-gray);
 }
-table select:hover,
-table select:focus-within,
-table select:focus-visible {
+table.items select:focus-within,
+table.items select:focus-visible {
  color: black;
 }
-table .button {
+form a[name=cancel] {
  border-color: var(--color-border-gray);
-  color: var(--color-table-gray);
+  color: var(--color-nav-gray);
+  fill: var(--color-nav-gray);
 }
-
 form table.items {
  border: none;
 }
@@ -557,9 +548,6 @@ form table.items td {
 form table.items td:first-child {
  color: inherit;
 }
-form table select {
-  color: black;
-}


 .centered {
@@ -592,6 +580,17 @@ form table select {
  gap: 0.8em;
  flex-direction: column;
 }
+[disabled] {
+/* label:has(input[disabled]) {
+ * TODO: disabled checkbox blue square focus removal; disabled label styling;
+ * focused label styling (currently only checkbox has focus)
+ * */
+  border-color: var(--color-border-gray) !important;
+  color: var(--color-border-gray) !important;
+  cursor: not-allowed;
+  fill: var(--color-border-gray) !important;
+  pointer-events: none;
+}


 details {
@@ -619,7 +618,7 @@ summary:has(.button) {
  padding-inline-end: 0;
 }
 summary .button {
-  border: 1px solid var(--color-border-gray);
+  border: solid 1px var(--color-border-gray);
  border-radius: inherit;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
@@ -635,10 +634,10 @@ details[open] summary::before {
 summary::marker {
  padding-left: 0.25em;
 }
-/* NOTE: use `details[open]::details-content` once widely available. */
+/* NOTE: use details[open]::details-content once widely available */
 details[open] ul {
  background: white;
-  border: 1px solid var(--color-border-gray);
+  border: solid 1px var(--color-border-gray);
  border-radius: 0.25em;
  box-shadow: 1px 1px 3px var(--color-border-gray);
  margin: -1px 0 0 0;
@@ -660,10 +659,3 @@ li input[type=checkbox] {
 li::marker {
  content: '';
 }
-/*
- * TODO:
- * * disable <label> containing disabled checkbox: `label:has(input[disabled])`,
- * * disabled label styling,
- * * focused label styling (currently only checkbox has focus),
- * * disabled checkbox blue square focus removal.
- * */
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -12,12 +12,6 @@ module ApplicationHelper
      labeled_field_for(method, options) { super }
    end

-    def submit(value = nil, options = {})
-      value, options = nil, value if value.is_a?(Hash)
-      options[:class] = @template.class_names('button', options[:class])
-      super
-    end
-
    private

    def labeled_field_for(method, options)
@@ -78,8 +72,13 @@ module ApplicationHelper
  end

  def labeled_form_for(record, options = {}, &block)
-    extra_options = {builder: LabeledFormBuilder, html: {class: 'labeled-form'}}
-    form_for(record, **merge_attributes(options, extra_options), &block)
+    extra_options = {builder: LabeledFormBuilder,
+                     data: {turbo: false},
+                     html: {class: 'labeled-form'}}
+    options = options.deep_merge(extra_options) do |key, left, right|
+      key == :class ? class_names(left, right) : right
+    end
+    form_for(record, **options, &block)
  end

  class TabularFormBuilder < ActionView::Helpers::FormBuilder
@@ -114,12 +113,8 @@ module ApplicationHelper
    end

    def button(value = nil, options = {}, &block)
-      # #button does not use #objectify_options/@default_options
-      value, options = nil, value if value.is_a?(Hash)
-      options = options.merge(
-        @default_options.slice(:form),
-        class: @template.class_names('button', options[:class])
-      )
+      # button does not use #objectify_options
+      options.merge!(@options.slice(:form))
      super
    end

@@ -140,21 +135,20 @@ module ApplicationHelper
    # [autofocus].  Otherwise IDs are not unique when multiple forms are open
    # and the first input gets focus.
    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)
+    options.merge!(builder: TabularFormBuilder, skip_default_ids: true)
    # 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

  def tabular_form_with(**options, &block)
-    extra_options = {builder: TabularFormBuilder, html: {autocomplete: 'off'}}
-    form_with(**merge_attributes(options, extra_options), &block)
+    options = options.deep_merge(builder: TabularFormBuilder,
+                                 html: {autocomplete: 'off'})
+    form_with(**options, &block)
  end

  def svg_tag(source, label = nil, options = {})
-    label, options = nil, label if label.is_a? Hash
-    svg_tag = tag.svg(**options) do
+    svg_tag = tag.svg(options) do
      tag.use(href: "#{image_path(source + ".svg")}#icon")
    end
    label.blank? ? svg_tag : svg_tag + tag.span(label)
@@ -165,7 +159,6 @@ module ApplicationHelper
      ['measurements', 'scale-bathroom', :restricted],
      ['quantities', 'axis-arrow', :restricted, 'right'],
      ['units', 'weight-gram', :restricted],
-      # TODO: display users tab only if >1 user present; sole_user?/sole_admin?
      ['users', 'account-multiple-outline', :admin],
    ]

@@ -213,7 +206,6 @@ module ApplicationHelper

  def render_errors(records)
    # 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
@@ -223,8 +215,8 @@ module ApplicationHelper
      # 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()"})
+          tag.div(sanitize(message)) + tag.button(sanitize("&times;"), tabindex: -1,
+                                                  onclick: "this.parentElement.remove();")
        end
      end
    end.join.html_safe
@@ -260,11 +252,4 @@ module ApplicationHelper

    [name, html_options]
  end
-
-  # Like Hash#deep_merge, but aware of HTML attributes.
-  def merge_attributes(left, right)
-    left.deep_merge(right) do |key, lvalue, rvalue|
-      key == :class ? class_names(lvalue, rvalue) : rvalue
-    end
-  end
 end
--- a/app/models/unit.rb
+++ b/app/models/unit.rb
@@ -26,8 +26,10 @@ class Unit < ApplicationRecord
    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: [
-      self.or(Unit.defaults).left_joins(:base)
+      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)
@@ -63,14 +65,8 @@ class Unit < ApplicationRecord
        ),
      # Fill base Units to display proper hierarchy. Duplicates will be removed
      # by final group() - can't be deduplicated with UNION due to 'portable' field.
-      # Use ActiveRecord::Relation (not a raw SelectManager) so the SQLite Arel
-      # visitor does not wrap it in parentheses inside the UNION ALL CTE body.
-      Unit.joins(
-        arel_table.create_join(
-          actionable_units,
-          arel_table.create_on(actionable_units[:base_id].eq(arel_table[:id]))
-        )
-      ).select(arel_table[Arel.star], Arel::Nodes.build_quoted(nil).as('portable'))
+      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()
@@ -78,7 +74,7 @@ class Unit < ApplicationRecord
        Arel::Nodes.build_quoted(1).as('multiplier'), # disregard multiplier when sorting
        units[:portable].minimum.as('portable')
      )
-      .from(units).group(units[:base_id], units[:symbol])
+      .from(units).group(:base_id, :symbol)
  }
  scope :ordered, ->{
    left_outer_joins(:base).order(ordering)
@@ -87,8 +83,8 @@ class Unit < ApplicationRecord
  def self.ordering
    [arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
     arel_table[:base_id].not_eq(nil),
-     arel_table[:multiplier],
-     arel_table[:symbol]]
+     :multiplier,
+     :symbol]
  end

  before_destroy do
--- a/config/credentials.yml.enc
+++ b/config/credentials.yml.enc
@@ -1 +1 @@
-OOGMGhfQuV67kqlMecZLcNfgrGS81KPAGmY27GnohtcGSPtiaqL8OZYsVf5IIOaI1K14ZEflln+E2deaIJ5apaq98f+1gJawGbAJeEfLCskJV/03nT8ICpRk+bxT/lzqeCIaUJOLk4708ufC9EpdpJD/jgVSAuI/iNMzzwMbNFvqNmx0Kmgp0mRpHSDGLZZkaP3GW7wdsJEVsNpSPIrkkGL1BvD+nHbmHjuGkn4MMsmm1Yz0M31jkJiDksT0SVeOcxWvOApclxm6VZOAws2l6YKEs/XoE7ye3ssjxdjdwjMzRXV7dwYclNBQGRoERVTozdYiFR4eAGMdlG0RsnUAp+edILH5nvHCIPb3la/dUTOzAQMNY0TqMMVUHGqGuVS/EMCX/w7zrmYN5C+2W8SfugrvTpAL--dUdvsDfbUdVrbmmo--fUwsWUp+DQGPtEF+Zq4ZTw==
+3nm9KZNtyLhPgZBVzOOkN2FXHD0uEMuzgb5Sl1MrAMmi6+iEFSzyTHfZFW2mz18VyNz5DDYvTODZqBDQKK+FQh70uEQkmGqaY5XsTOzUFzk56quaPNtZvFEGux1nX2avSbYQBs3HeyYyWyTAFhez5j8tVb6sZD2xZ8twa9KAB42j86NIHT9w/ZMFqZbGbdBoR1Mrqoy9/IWv2QgxMTpGR6JBpTUwauXm6wS/bTt8SCXF57JSVgvdw/BxFzoA3Xj6N5E89LbMfh54W2ruMhybka5E7zXN9z0v4oXt8GiYZFIODEYZwqzEVaUK1WXS5qb5OrDJFAzs29Uf/gDrIDx71Lot+jejCS+xFfI9454EnHcVH66wKuwF6ylKupJDffM0hQHplcEfVSq5UiDfbPXm46Vr0g1A--2RrmuzCBuHvYpPNA--ugbuRe7ivfDqeUCt6ahciA==
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -58,7 +58,4 @@ Rails.application.configure do
  # config.action_view.annotate_rendered_view_with_filenames = true

  config.log_level = :info
-
-  # Allow the default integration test host.
-  config.hosts << "www.example.com"
 end
--- a/lib/tasks/test_multi_db.rake
+++ b/lib/tasks/test_multi_db.rake
@@ -1,50 +0,0 @@
-namespace :test do
-  desc "Run Rails tests against all supported database adapters (SQLite, MySQL)"
-  task :all_adapters do
-    # DATABASE_URL overrides the adapter from database.yml at runtime.
-    # MySQL requires the mysql2 gem: bundle install --with mysql
-    adapters = {
-      "SQLite" => {
-        "DATABASE_URL" => "sqlite3:db/test.sqlite3"
-      },
-      "MySQL" => {
-        "DATABASE_URL" => format(
-          "mysql2://%s:%s@%s/%s",
-          ENV.fetch("DATABASE_USERNAME", "root"),
-          ENV.fetch("DATABASE_PASSWORD", ""),
-          ENV.fetch("DATABASE_HOST", "127.0.0.1"),
-          ENV.fetch("DATABASE_NAME", "fixin_test")
-        )
-      }
-    }
-
-    failed = []
-
-    adapters.each do |name, extra_env|
-      puts "\n#{"=" * 60}"
-      puts "  Running tests with #{name}"
-      puts "=" * 60
-
-      env = ENV.to_h.merge("RAILS_ENV" => "test").merge(extra_env)
-
-      # Reset test database; db:drop may fail on first run — that's fine
-      system(env, "bin/rails db:drop")
-      unless system(env, "bin/rails db:create db:schema:load")
-        failed << "#{name} (database setup)"
-        next
-      end
-
-      failed << name unless system(env, "bin/rails test")
-    end
-
-    puts "\n#{"=" * 60}"
-    if failed.any?
-      puts "  FAILED: #{failed.join(", ")}"
-      puts "=" * 60
-      exit 1
-    else
-      puts "  All adapters passed!"
-      puts "=" * 60
-    end
-  end
-end
--- a/test/controllers/default/units_controller_test.rb
+++ b/test/controllers/default/units_controller_test.rb
@@ -1,12 +1,8 @@
 require "test_helper"

 class Default::UnitsControllerTest < ActionDispatch::IntegrationTest
-  setup do
-    sign_in users(:alice)
-  end
-
  test "should get index" do
-    get default_units_url
+    get units_defaults_index_url
    assert_response :success
  end
 end
--- a/test/controllers/users_controller_test.rb
+++ b/test/controllers/users_controller_test.rb
@@ -2,9 +2,7 @@ require "test_helper"

 class UsersControllerTest < ActionDispatch::IntegrationTest
  setup do
-    @admin = users(:admin)
-    @user = users(:alice)
-    sign_in @admin
+    @user = users(:one)
  end

  test "should get index" do
@@ -12,25 +10,39 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
    assert_response :success
  end

+  test "should get new" do
+    get new_user_url
+    assert_response :success
+  end
+
+  test "should create user" do
+    assert_difference("User.count") do
+      post users_url, params: { user: { email: @user.email, status: @user.status } }
+    end
+
+    assert_redirected_to user_url(User.last)
+  end
+
  test "should show user" do
    get user_url(@user)
    assert_response :success
  end

+  test "should get edit" do
+    get edit_user_url(@user)
+    assert_response :success
+  end
+
  test "should update user" do
-    patch user_url(@user), params: { user: { status: :restricted } }, as: :turbo_stream
-    assert_equal "restricted", @user.reload.status
+    patch user_url(@user), params: { user: { email: @user.email, status: @user.status } }
+    assert_redirected_to user_url(@user)
  end

-  test "should not update self" do
-    patch user_url(@admin), params: { user: { status: :active } }, as: :turbo_stream,
-      headers: { "HTTP_REFERER" => users_url }
-    assert_response :redirect
-  end
+  test "should destroy user" do
+    assert_difference("User.count", -1) do
+      delete user_url(@user)
+    end

-  test "should forbid non-admin" do
-    sign_in @user
-    get users_url
-    assert_response :forbidden
+    assert_redirected_to users_url
  end
 end
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,10 +2,6 @@ ENV["RAILS_ENV"] ||= "test"
 require_relative "../config/environment"
 require "rails/test_help"

-class ActionDispatch::IntegrationTest
-  include Devise::Test::IntegrationHelpers
-end
-
 class ActiveSupport::TestCase
  # Run tests in parallel with specified workers
  parallelize(workers: :number_of_processors)