Exclude recently made invisible topics from the categories list. Also remove a couple n+1 queries.

app/models/category_list.rb

@@ -7,7 +7,8 @@ class CategoryList
     @categories = Category
                     .includes(featured_topics: [:category])
                     .includes(:featured_users)
-                    .order('topics_week desc, topics_month desc, topics_year desc')
+                    .where('topics.visible' => true)
+                    .order('categories.topics_week desc, categories.topics_month desc, categories.topics_year desc')
                     .to_a
 
     # Support for uncategorized topics

app/serializers/category_detailed_serializer.rb

@@ -1,6 +1,15 @@
-class CategoryDetailedSerializer < CategorySerializer
+class CategoryDetailedSerializer < ApplicationSerializer
 
-  attributes :topic_count, :topics_week, :topics_month, :topics_year
+  attributes :id,
+             :name,
+             :color,
+             :text_color,
+             :slug,
+             :topic_count,
+             :topics_week,
+             :topics_month,
+             :topics_year,
+             :description
 
   has_many :featured_users, serializer: BasicUserSerializer
   has_many :featured_topics, serializer: CategoryTopicSerializer, embed: :objects, key: :topics

app/serializers/category_topic_serializer.rb

@@ -3,7 +3,6 @@ require_dependency 'pinned_check'
 class CategoryTopicSerializer < ListableTopicSerializer
 
   attributes :visible, :closed, :archived, :pinned
-  has_one :category
 
   def pinned
     PinnedCheck.new(object, object.user_data).pinned?