model add scope

app/models/product.rb

@@ -2,6 +2,8 @@
 class Product < ActiveRecord::Base
     has_paper_trail
     self.table_name = 'products'
+    devise_for :admins
+
     #Thread.current[:current_user] = @current_user
     scope :active, -> { where(ptype: "cent_sale") }
     scope :inactive, -> { where(ptype: "direct_sale") }