diff --git a/app/models/category.rb b/app/models/category.rb
old mode 100644
new mode 100755
index 378dc16b9..ede0b27a4
--- a/app/models/category.rb
+++ b/app/models/category.rb
@@ -1,7 +1,7 @@
 class Category < ActiveRecord::Base
   belongs_to :topic, dependent: :destroy
   belongs_to :topic_only_relative_url,
-    select: "id, title",
+    select: "id, title, slug",
     class_name: "Topic",
     foreign_key: "topic_id"
   belongs_to :user