model add scope

app/models/admin_user.rb

@@ -12,7 +12,7 @@ class AdminUser < ActiveRecord::Base
   # Setup accessible (or protected) attributes for your model
 
   has_and_belongs_to_many :admin_roles, :join_table => :admin_roles_admin_users
-  attr_accessible :email, :id  , :admin_permission
+  attr_accessor :email, :id  , :admin_permission
 
   rails_admin do
     navigation_label '系统管理'