model add scope

app/models/product.rb

@@ -129,8 +129,8 @@ class Product < ActiveRecord::Base
     rails_admin do 
         navigation_label '商品管理'
         weight -240
-        authenticate_admin_user!
         list do
+            before_filter :authenticate_admin_user!
 
             if current_admin_user.id==1
                 scopes [:inactive]