Put back some field so ad_image can work

app/models/ad_image.rb

@@ -5,7 +5,10 @@ class AdImage
   mount_uploader :file, ImageUploader
 
   field :title, localize: true
-  field :context, localize: true
+  field :context, localize: true  
+  field :to_save, :type => Boolean
+  field :to_destroy, :type => Boolean
+
   
   field :direct_to_after_click,type: Boolean