CLEANUP: remove 'contains_messages' leftover 💩

app/assets/javascripts/discourse/components/category-chooser.js.es6

@@ -22,7 +22,6 @@ export default ComboboxView.extend({
     return categories.filter(c => {
       if (scopedCategoryId && c.get('id') !== scopedCategoryId && c.get('parent_category_id') !== scopedCategoryId) { return false; }
       if (c.get('isUncategorizedCategory')) { return false; }
-      if (c.get('contains_messages')) { return false; }
       return c.get('permission') === PermissionType.FULL;
     });
   },

app/assets/javascripts/discourse/controllers/topic.js.es6

@@ -90,12 +90,7 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
     this.set('selectedReplies', []);
   }.on('init'),
 
-  @computed("model.isPrivateMessage", "model.category_id")
-  showCategoryChooser(isPrivateMessage, categoryId) {
-    const category = Discourse.Category.findById(categoryId);
-    const containsMessages = category && category.get("contains_messages");
-    return !isPrivateMessage && !containsMessages;
-  },
+  showCategoryChooser: Ember.computed.not("model.isPrivateMessage"),
 
   gotoInbox(name) {
     var url = '/users/' + this.get('currentUser.username_lower') + '/messages';

app/assets/javascripts/discourse/models/category.js.es6

@@ -87,7 +87,6 @@ const Category = RestModel.extend({
         custom_fields: this.get('custom_fields'),
         topic_template: this.get('topic_template'),
         suppress_from_homepage: this.get('suppress_from_homepage'),
-        contains_messages: this.get("contains_messages"),
       },
       type: this.get('id') ? 'PUT' : 'POST'
     });

app/assets/javascripts/discourse/models/composer.js.es6

@@ -67,12 +67,10 @@ const Composer = RestModel.extend({
   creatingPrivateMessage: Em.computed.equal('action', PRIVATE_MESSAGE),
   notCreatingPrivateMessage: Em.computed.not('creatingPrivateMessage'),
 
-  @computed("privateMessage", "archetype.hasOptions", "categoryId")
-  showCategoryChooser(isPrivateMessage, hasOptions, categoryId) {
+  @computed("privateMessage", "archetype.hasOptions")
+  showCategoryChooser(isPrivateMessage, hasOptions) {
     const manyCategories = Discourse.Category.list().length > 1;
-    const category = Discourse.Category.findById(categoryId);
-    const containsMessages = category && category.get("contains_messages");
-    return !isPrivateMessage && !containsMessages && (hasOptions || manyCategories);
+    return !isPrivateMessage && (hasOptions || manyCategories);
   },
 
   privateMessage: function(){

app/assets/javascripts/discourse/templates/components/edit-category-settings.hbs

@@ -20,12 +20,6 @@
 </section>
 
 {{#if emailInEnabled}}
-  <section class='field'>
-    <label>
-      {{input type="checkbox" checked=category.contains_messages}}
-      {{i18n 'category.contains_messages'}}
-    </label>
-  </section>
   <section class='field'>
     <label>
       {{input type="checkbox" checked=category.email_in_allow_strangers}}

app/controllers/categories_controller.rb

@@ -178,7 +178,6 @@ class CategoriesController < ApplicationController
                         :position,
                         :email_in,
                         :email_in_allow_strangers,
-                        :contains_messages,
                         :suppress_from_homepage,
                         :parent_category_id,
                         :auto_close_hours,

app/models/category.rb

@@ -474,7 +474,6 @@ end
 #  auto_close_based_on_last_post :boolean          default(FALSE)
 #  topic_template                :text
 #  suppress_from_homepage        :boolean          default(FALSE)
-#  contains_messages             :boolean          default(FALSE), not null
 #
 # Indexes
 #

app/models/topic.rb

@@ -544,7 +544,6 @@ class Topic < ActiveRecord::Base
 
   def change_category_to_id(category_id)
     return false if private_message?
-    return false if category.try(:contains_messages)
 
     new_category_id = category_id.to_i
     # if the category name is blank, reset the attribute

app/serializers/basic_category_serializer.rb

@@ -19,8 +19,7 @@ class BasicCategorySerializer < ApplicationSerializer
              :background_url,
              :can_edit,
              :topic_template,
-             :has_children,
-             :contains_messages
+             :has_children
 
   def include_parent_category_id?
     parent_category_id