Rails after_save error

Question

Это правильный способ использования обратного вызова after_save?

class CouponsController < ApplicationController 
after_save :remove_restrictions 
private 
    def remove_restrictions 

     logger.debug("in after save") 
    end 

end 

Этот код генерирует ошибку как

undefined method `after_save' for CouponsController:Class 

Что такое правильный способ использования after_save?

Answer 1

приложение/модели/coupon.rb

class Coupon < ActiveRecord::Base 
    # after_save goes to your model 
    after_save :remove_restrictions 

    private 

    def remove_restrictions 
    logger.debug("in after save") 
    end 
end 

приложение/контроллеры/coupon_controller.rb

class CouponController < ApplicationController 
    # after_filters goes to your controller 
    after_filter :remove_restrictions 

    private 

    def remove_restrictions 
    logger.debug("in after filters") 
    end 
end