Updated GroupSerializer for group_category

• Updated:
- GroupSerializer for group_category

app/serializers/rest/group_serializer.rb

@@ -4,14 +4,16 @@ class REST::GroupSerializer < ActiveModel::Serializer
   include RoutingHelper
   
   attributes :id, :title, :description, :description_html, :cover_image_url, :is_archived,
-    :member_count, :created_at, :is_private, :is_visible, :slug, :tags, :category
+    :member_count, :created_at, :is_private, :is_visible, :slug, :tags, :group_category
 
   def id
     object.id.to_s
   end
 
-  def category
-    object.group_categories_id
+  def group_category
+    if object.group_categories
+      object.group_categories
+    end
   end
 
   def description