Moved RELATIONABLE_MODELS from controller to model

app/controllers/related_contents_controller.rb

@@ -1,5 +1,4 @@
 class RelatedContentsController < ApplicationController
-  RELATIONABLE_MODELS = %w{proposals debates}
   VALID_URL = /#{Setting['url']}\/.*\/.*/
 
   skip_authorization_check
@@ -31,7 +30,7 @@ class RelatedContentsController < ApplicationController
       if valid_url?
         url = params[:url]
 
-        related_klass = url.match(/\/(#{RELATIONABLE_MODELS.join("|")})\//)[0].gsub("/", "")
+        related_klass = url.match(/\/(#{RelatedContent::RELATIONABLE_MODELS.join("|")})\//)[0].gsub("/", "")
         related_id = url.match(/\/[0-9]+/)[0].gsub("/", "")
 
         @related = (related_klass.singularize.camelize.constantize).find_by_id(related_id)

app/models/related_content.rb

@@ -1,5 +1,6 @@
 class RelatedContent < ActiveRecord::Base
   RELATED_CONTENTS_REPORT_THRESHOLD = Setting['related_contents_report_threshold'].to_i
+  RELATIONABLE_MODELS = %w{proposals debates}
 
   belongs_to :parent_relationable, polymorphic: true
   belongs_to :child_relationable, polymorphic: true

app/views/relationable/_form.html.erb

@@ -2,7 +2,7 @@
     <label><%= t("related_content.label") %></label>
 
     <p class="help-text" id="related_content_help_text">
-      <%= t("related_content.help", org: setting['org_name']) %>
+      <%= t("related_content.help", models: t('related_content.content_title').values.to_sentence, org: setting['org_name']) %>
     </p>
 
     <div class="input-group">