Ruby on rails 在Rails迁移中触发删除查询的更好方法是什么

我是Rails的新手，我想写一些自我记录查询。目前我正在对整个查询进行硬编码。有更简单的方法吗

  def self.down
    delete("delete from trigger_events where name = 'CHANGE_APPROVED'")
    delete("delete from notifications where trigger_event_id = 5")
    delete("delete from notification_recipients where notification_id = 5")
    delete("delete from n_m_d where notification_id = 5 and msg_index=15")
  end

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谢谢

您可以用ActiveRecord风格来完成：

  def self.down
    TriggerEvents.find_by_name('CHANGE_APPROVED').destroy_all
    Notifications.find_by_trigger_event_id(5).destroy_all
    NotificationRecipients.find_by_notification_id(5).destroy_all
    NMD.find_by_notification_id_and_msg_index(5,15).destroy_all
  end

---

根据@shingara，但经过修改以处理未发现的病例

def self.down
  TriggerEvents.find_all_by_name('CHANGE_APPROVED').map(&:destroy)
  Notifications.find_all_by_trigger_event_id(5).map(&:destroy)
  NotificationRecipients.find_all_by_notification_id(5).map(&:destroy)
  NMD.find_all_by_notification_id_and_msg_index(5,15).map(&:destroy)
end

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我尝试了您的解决方案，但当查询的值为零时出现异常。如何干净利落地完成？感谢您提供的未找到的案例解决方案！！！！这正是我要找的！