Embed attribute_fields and sub_roles

app/models/user/role.rb

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