Ruby on rails 如何在RubyonRails中正确销毁相关记录？

我有一个方法，实际上删除了当前用户的所有消息，实际上我的意思是，它只是将消息表中所有消息的状态设置为1，这意味着消息不会显示给删除消息的用户

消息线程属于消息 消息有一个消息线程

下面是我的模型方法，它解决了这个问题：

    def delete_all_users_messages(user_id, parent_id)
      message = Message.find_by_parent_id(parent_id)
      message.children.where( :sender_id => user_id ).update_all( :sender_status => 1)
      message.children.where( :recipient_id => user_id ).update_all( :recipient_status => 1 )
      thread = message.message_thread
      thread.update_attribute(:sender_status, 1) if thread.sender_id == user_id 
      thread.update_attribute(:recipient_status, 1) if thread.recipient_id == user_id 
      if thread.sender_status == 1 && thread.recipient_status == 1
      thread.destroy
      Message.destroy_all(:parent_id => parent_id)
      end
    end

我有一个message_threads表，它引用了我的messages表中的消息。它引用会话的第一条消息，该消息的父id等于消息的id，表示。第一条消息包含子消息

正如您在我的方法末尾所看到的，我销毁了message_threads表中的线程，如果该表中的两个用户状态都设置为1，则删除剩下的所有消息

我使用1个用户帐户对此进行了测试，它用于将用户消息线程状态更新为1以及所有用户消息

因此，我去了与他们交谈的用户的帐户，尝试了同样的方法，我得到：

当我检查记录时，该用户的消息状态设置为。消息线程被删除

但是消息仍然在消息表中，我得到：

堆栈级别太深

以下是控制器操作：

  def destroy_all_messages
    Message.delete_all_users_messages(current_user.id, params[:format])
    flash[:success] = "Messages deleted"
    redirect_to messages_path
  end

在我的日志中看起来像一个连续的循环。这可能是导致问题的原因吗？我删除了一些，因为它不适合所有人，但我相信你可以在日志中看到重复发生的情况

Started DELETE "/messages/delete_all_messages.315" for 127.0.0.1 at 2012-02-21 15:27:14 +0000
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1] Processing by MessagesController#destroy_all_messages as 
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   Parameters: {"authenticity_token"=>"yelkcp72223dji4YVumgG9gUEK/U/Mwqwd0pc1WRG+0="}
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   User Load (0.4ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 4 LIMIT 1
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   Message Load (0.9ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315 LIMIT 1
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   SQL (20.8ms)  UPDATE `messages` SET `sender_status` = 1 WHERE `messages`.`parent_id` = 315 AND `messages`.`sender_id` = 4
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   SQL (37.3ms)  UPDATE `messages` SET `recipient_status` = 1 WHERE `messages`.`parent_id` = 315 AND `messages`.`recipient_id` = 4
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   MessageThread Load (0.4ms)  SELECT `message_threads`.* FROM `message_threads` WHERE `message_threads`.`message_id` = 315 ORDER BY message_threads.updated_at DESC LIMIT 1
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.1ms)  BEGIN
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.3ms)  UPDATE `message_threads` SET `recipient_status` = 1, `updated_at` = '2012-02-21 15:27:14' WHERE `message_threads`.`id` = 803
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.4ms)  COMMIT
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.1ms)  BEGIN
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   SQL (0.2ms)  DELETE FROM `message_threads` WHERE `message_threads`.`id` = 803
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.3ms)  COMMIT
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   Message Load (0.3ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.1ms)  BEGIN
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM 
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]   CACHE (0.0ms)  SELECT `messages`.* FROM `messages` WHERE `messages`.`parent_id` = 315
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1]    (0.1ms)  ROLLBACK
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1] Completed 500 Internal Server Error in 400ms
[51b1090d2a7185c9b2f42fa3213006d1] [127.0.0.1] 
SystemStackError (stack level too deep):
  actionpack (3.2.0) lib/action_dispatch/middleware/reloader.rb:70

---

善良的问候

我怀疑循环是由

销毁

方法引起的。我看不出你发布的代码到底是怎么写的，但我可以看看以下两种方法：自定义

destroy

或

before\u destroy

方法，这些方法是你编写的，在其他对象上调用

destroy

方法，或者与

：dependent=>：destroy[\u all]

修饰符的关系。如果这两种方法中的任何一种都能够创建循环依赖关系，那么您就陷入了一个循环中

另外：如果您有一个模型，其中

destroy

方法不需要执行任何操作，请使用该模型的

delete

和

delete\u all

。它们不运行任何析构函数——它们只是直接从数据库中删除行——因此它们速度更快，而且不会冒循环的风险。当然，当一个模型被期望清理它的孩子时，你不能这样做，但是对于“叶子”模型来说，他们很棒

---

希望这有帮助

即使只是运行这个“Message.destroy\u all”（：parent\u id=>315）在rails控制台中给了我循环然后堆栈级别太深的错误。我猜这与子项有关。@LondonGuy-似乎有可能。你能将其更改为

delete\u all

调用吗？如果消息没有自己的子项，它们需要删除，这应该可以解决。好的，我想我已经解决了。这是因为第一个p并不是所有的孩子都将其父id设置为消息的主id。但在我的项目中的其他一些地方，我以前是这样设置的，这样我可以调用所有消息，当我调用“children”时，这些消息都会返回“.如果第一个没有设置，那么当我给孩子们打电话时，它就被遗漏了。”。因此，我应该使用发送者id和接收者id，而不是通过父id查找邮件。只使用父id更容易查找，但如果找不到解决方案，我想我必须用另一种方法来查找。删除所有使用所有父id的集合，甚至是实际的父id集合。嗯，想知道“全部删除”和“销毁”之间有什么大区别吗_all@LondonGuy-“恐怕你把我弄丢了，但很高兴听到它起作用了！无论如何，这是我找到的关于删除和销毁之间区别的最好解释。仍然不是很清楚，但希望仍然有用。干杯