Destroy user_attributes and attribute_values when a user is destroyed

app/controllers/panel/users_controller.rb

@@ -65,6 +65,10 @@ class Panel::UsersController < ApplicationController
     else
       @user = User.find(params[:id]) 
       @user.destroy
+      @user.user_attributes.each do |ua|
+        ua.attribute_values.each(&:destroy)
+        ua.destroy
+      end
     end
     
     redirect_to :action => :index

app/models/user.rb

@@ -10,6 +10,7 @@ class User
   field :admin, :type => Boolean, :default => true
   field :active_roles, :type => Array
   
+  has_many :user_attributes
   has_many :user_roles
   has_many :user_infos
   before_save :clean_active_roles

lib/tasks/dev.rake

@@ -41,8 +41,8 @@ namespace :dev do
     urm_2.attribute_models.build( :key => 'major', :locale => true, :i18n_variable_id => var_6.id, :markup => 'text_field', :list_options => [] )
     urm_2.save!
     uim_1 = UserInfoModel.new( :key => 'profile', :i18n_variable_id => var_7.id, :built_in => true )
-    uim_1.attribute_models.build( :key => 'family_name', :locale => true, :i18n_variable_id => var_8.id, :markup => 'text_field', :list_options => [] )
-    uim_1.attribute_models.build( :key => 'first_name', :locale => true, :i18n_variable_id => var_9.id, :markup => 'text_field', :list_options => [] )
+    uim_1.attribute_models.build( :key => 'family_name', :locale => true, :i18n_variable_id => var_8.id, :markup => 'text_field', :list_options => [], :built_in => true )
+    uim_1.attribute_models.build( :key => 'first_name', :locale => true, :i18n_variable_id => var_9.id, :markup => 'text_field', :list_options => [], :built_in => true )
     uim_1.save! 
     
     layout = Layout.create!( :name => 'root', :description => 'root', :content => File.open("#{RAILS_ROOT}/lib/template/root.layout").read )