work in progress wide category list

app/serializers/category_detailed_serializer.rb

@@ -6,6 +6,7 @@ class CategoryDetailedSerializer < ApplicationSerializer
              :text_color,
              :slug,
              :topic_count,
+             :post_count,
              :topics_week,
              :topics_month,
              :topics_year,

app/serializers/listable_topic_serializer.rb

@@ -19,6 +19,12 @@ class ListableTopicSerializer < BasicTopicSerializer
              :closed,
              :archived
 
+  has_one :last_poster, serializer: BasicUserSerializer, embed: :objects
+
+  def include_associations!
+    include! :last_poster if object.include_last_poster
+  end
+
   def bumped
     object.created_at < object.bumped_at
   end