model add scope

app/models/product.rb

@@ -126,12 +126,13 @@ class Product < ActiveRecord::Base
     end
 
 
-    rails_admin do 
+    rails_admin do
+        controller do
+            before_filter :authenticate_admin_user!, :only => :index
+        end
         navigation_label '商品管理'
         weight -240
         list do
-            before_filter :authenticate_admin_user!
-
             if current_admin_user.id==1
                 scopes [:inactive]
             end