Question

我有3个模特

HiringTag

class HiringTag < ActiveRecord::Base
  attr_accessible :name, :staffroom_id
  validates :name, presence: true

  has_many :hiring_tag_applications
  has_many :job_applications, through: :hiring_tag_applications

  after_destroy { |application|
    HiringTagApplication.destroy(application.job_applications.pluck(:job_application_id))
end

HiringTagApplication

class HiringTagApplication < ActiveRecord::Base
  belongs_to :hiring_tag, dependent: :destroy
  belongs_to :job_application
end

在线招聘

class JobApplication < ActiveRecord::Base
  has_many :hiring_tag_applications
  has_many :hiring_tags, through: :hiring_tag_applications
end

我想要做的是：当我销毁HiringTag或JobApplication时，我希望在HiringTagApplication中删除相关数据，因为您会注意到我有after_destroy 1}}内部HiringTag回调确实被执行但我得到的错误是：

无法找到id = 96453
的HiringTagApplication

96453不是id的{{1}}，而是HiringTagApplication

如何更正此内容以便删除记录？

Answer 1

无需after_destroy，只需正确使用dependent: :destroy：

class HiringTag < ActiveRecord::Base
  has_many :hiring_tag_applications, dependent: :destroy
end

和

class JobApplication < ActiveRecord::Base
  has_many :hiring_tag_applications, dependent: :destroy
end

＆安培;将其从关联表中删除

class HiringTagApplication < ActiveRecord::Base
  belongs_to :hiring_tag
  belongs_to :job_application
end

现在，每当HiringTag或JobApplication被删除时，其关联的HiringTagApplication也将被删除

Rails - 在销毁父级时删除has_many关系

1 个答案: