ruby-on-rails - rails : Delete associated records on object destroy

Question

我有2个模型

 class Deal < ActiveRecord::Base
   has_many :couponizations, dependent: :destroy     
   has_many :coupon_codes, through: :couponizations, source: :coupon_code, dependent: :destroy
   accepts_nested_attributes_for :coupon_codes, allow_destroy: true
 end

和

class CouponCode < ActiveRecord::Base
   has_one :couponization, dependent: :destroy
   has_one :deal, through: :couponization, source: :deal

由多对多关系链接

class Couponization < ActiveRecord::Base
   belongs_to :coupon_code
   belongs_to :deal
end

尽管我指定了 dependent: :destroy选项，当我删除交易时，优惠券代码不会被删除。但是优惠券删除成功。有没有办法在对象销毁时删除关联的嵌套记录？

Answer 1

选项 dependent: :destroy与 :through 一起使用时被忽略(见 doc)。你必须手动完成，使用 after_destroy callback例如。

 class Deal

   after_destroy :destroy_coupon_codes

   private

   def destroy_coupon_codes
     self.coupon_codes.destroy_all   
   end
 end