model add scope

app/models/product.rb

@@ -2,6 +2,7 @@
 class Product < ActiveRecord::Base
     has_paper_trail
     self.table_name = 'products'
+    authorize! :index, @user, :message=> 'Not authorized as an administrator.'
 
     scope :active, -> { where(ptype: "cent_sale") }
     scope :inactive, -> { where(ptype: "direct_sale") }