model add scope

app/models/product.rb

@@ -121,7 +121,7 @@ class Product < ActiveRecord::Base
             rate = (( self.price.to_f - self.buy_price.to_f )/self.buy_price.to_f)*100
         end 
             #return ((rate*100).round.to_f/100).to_s + "%"
-            user= "#{current_admin_user.email}"
+            user= RailsAdmin.config.admin_user
         return user
     end