model add scope

app/models/product.rb

@@ -120,7 +120,7 @@ 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 + "%"
-        return  config.current_user_method { current_admin_user }
+        return  RailsAdmin::Config.current_admin_user
     end
 
     rails_admin do