feat: replace Member.all with TomSelect for meeting organisers

- Add organisers field to TomSelect initialization with remove_button plugin
- Pre-populate existing organisers on edit form using options_for_select
- Add remove_from_tom_select test helper for multi-select interaction
- Update tests for TomSelect interaction (add/remove organisers)
- Exclude meeting_organisers from Chosen.js initialization

Reuses /admin/members/search endpoint from PR #2562.
Fixes performance issue loading 28k+ members on every page load.

Author: mroderick

app/assets/javascripts/application.js

@@ -99,13 +99,43 @@ $(function() {
     });
   }
 
+  // TomSelect for meeting organisers (multi-select)
+  if ($('#meeting_organisers').length) {
+    new TomSelect('#meeting_organisers', {
+      plugins: ['remove_button'],
+      placeholder: 'Type to search members...',
+      valueField: 'id',
+      labelField: 'full_name',
+      searchField: ['full_name', 'email'],
+      create: false,
+      loadThrottle: 300,
+      shouldLoad: function(query) {
+        return query.length >= 3;
+      },
+      load: function(query, callback) {
+        fetch('/admin/members/search?q=' + encodeURIComponent(query))
+          .then(response => response.json())
+          .then(json => callback(json))
+          .catch(() => callback());
+      },
+      render: {
+        option: function(item, escape) {
+          return '<div>' + escape(item.full_name) + ' <small class="text-muted">' + escape(item.email) + '</small></div>';
+        },
+        no_results: function(data, escape) {
+          return '<div class="no-results">No members found</div>';
+        }
+      }
+    });
+  }
+
   // Chosen for all other selects (exclude TomSelect fields)
   // Chosen hides inputs and selects, which becomes problematic when they are
   // required: browser validation doesn't get shown to the user.
   // This fix places "the original input behind the Chosen input, matching the
   // height and width so that the warning appears in the correct position."
   // https://github.com/harvesthq/chosen/issues/515#issuecomment-474588057
-  $('select').not('#member_lookup_id, #meeting_invitations_member').on('chosen:ready', function () {
+  $('select').not('#member_lookup_id, #meeting_invitations_member, #meeting_organisers').on('chosen:ready', function () {
     var height = $(this).next('.chosen-container').height();
     var width = $(this).next('.chosen-container').width();
 
@@ -117,7 +147,7 @@ $(function() {
     }).show();
   });
 
-  $('select').not('#member_lookup_id, #meeting_invitations_member').chosen({
+  $('select').not('#member_lookup_id, #meeting_invitations_member, #meeting_organisers').chosen({
     allow_single_deselect: true,
     no_results_text: 'No results matched'
   });

app/controllers/admin/meetings_controller.rb

@@ -7,10 +7,10 @@ def new
 
   def create
     @meeting = Meeting.new(meeting_params)
-    set_organisers(organiser_ids)
-    set_chapters(chapter_ids)
 
     if @meeting.save
+      set_organisers(organiser_ids)
+      set_chapters(chapter_ids)
       redirect_to [:admin, @meeting], notice: t('admin.messages.meeting.created')
     else
       flash[:notice] = @meeting.errors.full_messages.join(', ')
@@ -62,10 +62,10 @@ def slug
   end
 
   def meeting_params
-    params.expect(meeting: [
-      :name, :description, :slug, :date_and_time, :local_date, :local_time, :local_end_time,
-      :invitable, :spaces, :venue_id, :sponsor_id, :chapters
-    ])
+    params.expect(meeting: %i[
+                    name description slug date_and_time local_date local_time local_end_time
+                    invitable spaces venue_id sponsor_id chapters
+                  ])
   end
 
   def organiser_ids

app/views/admin/meetings/_form.html.haml

@@ -1,3 +1,7 @@
+- content_for :head do
+  %link{ href: 'https://cdn.jsdelivr.net/npm/tom-select@2.4.3/dist/css/tom-select.bootstrap5.min.css', rel: 'stylesheet', type: 'text/css' }
+  %script{ src: 'https://cdn.jsdelivr.net/npm/tom-select@2.4.3/dist/js/tom-select.complete.min.js' }
+
 = simple_form_for [:admin, @meeting] do |f|
   .row
     .col-12
@@ -17,7 +21,11 @@
     .col-12
       = f.association :venue, input_html: { data: { placeholder: 'Select venue' }}, required: true
     .col-12
-      = f.input :organisers, collection: Member.all, label_method: :full_name, value_method: :id, selected: @meeting.organisers.map(&:id), input_html: { multiple: true }
+      = f.label :organisers
+      = f.select :organisers,
+                 options_for_select(@meeting.organisers.map { |o| [o.full_name, o.id] }, @meeting.organisers.map(&:id)),
+                 { include_blank: false },
+                 { multiple: true, class: 'tom-select', data: { placeholder: 'Type to search members...' } }
     .col-12
       = f.input :chapters, collection: Chapter.all, label_method: :name, value_method: :id, selected: @meeting.chapters.map(&:id), input_html: { multiple: true }
     .col-12

spec/features/admin/meeting_spec.rb

@@ -21,8 +21,8 @@
       click_on 'Save'
 
       expect(page).to have_content('Meeting successfully created')
-      expect(page.current_path)
-        .to eq(admin_meeting_path("#{I18n.l(today, format: :year_month).downcase}-august-meeting-1"))
+      expect(page)
+        .to have_current_path(admin_meeting_path("#{I18n.l(today, format: :year_month).downcase}-august-meeting-1"), ignore_query: true)
       expect(page).to have_content 'Invite'
     end
 
@@ -48,18 +48,30 @@
       expect(page).to have_content('Slug has already been taken')
     end
 
-    scenario 'successfully' do
+    scenario 'successfully', :js do
       permissions = Fabricate(:permission, resource: meeting, name: 'organiser')
 
       visit edit_admin_meeting_path(meeting)
-      fill_in 'Name', with: "March Meeting"
-      unselect permissions.members.first.full_name
+      fill_in 'Name', with: 'March Meeting'
+      remove_from_tom_select(permissions.members.first.full_name)
 
       click_on 'Save'
 
       expect(page).to have_content('You have successfully updated the details of this meeting')
       expect(page).to have_css(%(span[title="#{permissions.members.last.full_name}"]))
-      expect(page).to_not have_css(%(span[title="#{permissions.members.first.full_name}"]))
+      expect(page).not_to have_css(%(span[title="#{permissions.members.first.full_name}"]))
+    end
+
+    scenario 'adding an organiser', :js do
+      meeting = Fabricate(:meeting)
+      new_organiser = Fabricate(:member)
+
+      visit edit_admin_meeting_path(meeting)
+      select_from_tom_select(new_organiser.full_name, from: 'meeting_organisers')
+
+      click_on 'Save'
+
+      expect(page).to have_css(%(span[title="#{new_organiser.full_name}"]))
     end
   end
 
@@ -78,7 +90,7 @@
     scenario 'when no format is used then it redirects to the meeting page' do
       visit attendees_emails_admin_meeting_path(meeting)
 
-      expect(page.current_path).to eq(admin_meeting_path(meeting))
+      expect(page).to have_current_path(admin_meeting_path(meeting), ignore_query: true)
     end
   end
 
@@ -88,7 +100,7 @@
       meeting = Fabricate(:meeting, chapters: [chapter])
 
       visit invite_admin_meeting_path(meeting)
-      expect(page).to have_content("Invitations are being sent out")
+      expect(page).to have_content('Invitations are being sent out')
     end
 
     scenario 'does not send the invitations to banned members' do

spec/support/select_from_tom_select.rb

@@ -29,6 +29,14 @@ def select_from_tom_select(item_text, from: nil)
     # Click the matching option
     find('.ts-dropdown .option', text: item_text, match: :prefer_exact).click
   end
+
+  # Remove an item from a TomSelect multi-select
+  # @param item_text [String] The text of the item to remove (must match exactly)
+  def remove_from_tom_select(item_text)
+    within '.ts-wrapper' do
+      find('.item', text: item_text, match: :prefer_exact).find('.remove').click
+    end
+  end
 end
 
 RSpec.configure do |config|