删除对象销毁Rails上的关联记录

I have 2 models

我有2个型号

 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
 class Deal < Activ