Change FormDescription routes to use locale parameter instead of id

app/controllers/admin/form_descriptions_controller.rb

@@ -55,6 +55,6 @@ def set_conference
   end
 
   def set_form_description
-    @form_description = FormDescription.where(conference: @conference).find(params[:id])
+    @form_description = FormDescription.where(conference: @conference).find_by!(locale: params[:locale])
   end
 end

app/models/form_description.rb

@@ -31,6 +31,10 @@ def to_dataset
 
   validate :validate_fallback_options_json
 
+  def to_param
+    locale
+  end
+
   before_save :render_markdown
 
   def fallback_options

config/routes.rb

@@ -18,7 +18,7 @@
 
       resource :booth_assignment, only: %i(show update)
 
-      resources :form_descriptions, except: %i(index)
+      resources :form_descriptions, param: :locale, except: %i(index)
       resources :plans, except: %i(index show)
 
       resources :sponsorships, except: %i(index new create) do

spec/models/form_description_spec.rb

@@ -3,6 +3,21 @@
 RSpec.describe FormDescription, type: :model do
   let(:conference) { FactoryBot.create(:conference) }
 
+  describe '#to_param' do
+    it 'returns locale instead of id' do
+      form = FactoryBot.create(:form_description, conference:, locale: 'en')
+      expect(form.to_param).to eq('en')
+    end
+
+    it 'returns different locales correctly' do
+      form_en = FactoryBot.create(:form_description, conference:, locale: 'en')
+      form_ja = FactoryBot.create(:form_description, conference:, locale: 'ja')
+
+      expect(form_en.to_param).to eq('en')
+      expect(form_ja.to_param).to eq('ja')
+    end
+  end
+
   describe '#render_markdown callback' do
     it 'renders markdown fields to HTML on save' do
       form = FactoryBot.create(:form_description,

spec/routing/form_descriptions_routing_spec.rb

@@ -0,0 +1,66 @@
+require 'rails_helper'
+
+RSpec.describe Admin::FormDescriptionsController, type: :routing do
+  describe 'routing' do
+    it 'routes to #new' do
+      expect(get: '/admin/conferences/rk2025/form_descriptions/new').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'new',
+        conference_slug: 'rk2025'
+      )
+    end
+
+    it 'routes to #create' do
+      expect(post: '/admin/conferences/rk2025/form_descriptions').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'create',
+        conference_slug: 'rk2025'
+      )
+    end
+
+    it 'routes to #show using locale parameter' do
+      expect(get: '/admin/conferences/rk2025/form_descriptions/en').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'show',
+        conference_slug: 'rk2025',
+        locale: 'en'
+      )
+    end
+
+    it 'routes to #edit using locale parameter' do
+      expect(get: '/admin/conferences/rk2025/form_descriptions/ja/edit').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'edit',
+        conference_slug: 'rk2025',
+        locale: 'ja'
+      )
+    end
+
+    it 'routes to #update via PUT using locale parameter' do
+      expect(put: '/admin/conferences/rk2025/form_descriptions/en').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'update',
+        conference_slug: 'rk2025',
+        locale: 'en'
+      )
+    end
+
+    it 'routes to #update via PATCH using locale parameter' do
+      expect(patch: '/admin/conferences/rk2025/form_descriptions/en').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'update',
+        conference_slug: 'rk2025',
+        locale: 'en'
+      )
+    end
+
+    it 'routes to #destroy using locale parameter' do
+      expect(delete: '/admin/conferences/rk2025/form_descriptions/ja').to route_to(
+        controller: 'admin/form_descriptions',
+        action: 'destroy',
+        conference_slug: 'rk2025',
+        locale: 'ja'
+      )
+    end
+  end
+end