FEATURE - group modetators visual indicator (#10310)

app/serializers/post_serializer.rb

@@ -60,6 +60,7 @@ class PostSerializer < BasicPostSerializer
              :moderator?,
              :admin?,
              :staff?,
+             :group_moderator,
              :user_id,
              :draft_sequence,
              :hidden,
@@ -140,6 +141,20 @@ class PostSerializer < BasicPostSerializer
     !!(object&.user&.staff?)
   end
 
+  def group_moderator
+    !!@group_moderator
+  end
+
+  def include_group_moderator?
+    @group_moderator ||= begin
+      if @topic_view
+        @topic_view.category_group_moderator_user_ids.include?(object.user_id)
+      else
+        object&.user&.guardian&.is_category_group_moderator?(object&.topic&.category)
+      end
+    end
+  end
+
   def yours
     scope.user == object.user
   end