Structure page with json

app/models/item.rb

@@ -10,7 +10,7 @@ class Item
   field :path
   field :is_published, :type => Boolean, :default => false
   field :enabled_for, :type => Array, :default => nil
-  field :menu_enabled_for, :type => Array, :default => nil
+  field :menu_enabled_for, :type => Hash, :default => nil
   field :title, localize: true
   field :sitemap_enabled, :type => Hash, :default => {}