Embed attribute_fields and sub_roles

app/models/user/attribute.rb

@@ -7,7 +7,7 @@ class Attribute
   field :built_in, :type => Boolean, :default => false
   field :disabled, :type => Boolean, :default => false
   
-  has_many :attribute_fields, :autosave => true, :dependent => :destroy
+  embeds_many :attribute_fields, :cascade_callbacks => true
   has_one :i18n_variable, :as => :language_value, :autosave => true, :dependent => :destroy
   accepts_nested_attributes_for :attribute_fields, :allow_destroy => true