在Django中的事务提交后运行代码 [英] run code after transaction commit in Django

问题描述

我需要向rabbitmq服务器发送一些消息以进行离线处理，但是消息会得到在Django事务被提交之前给消费者。

我的消息是在模型的post_save信号中发送的。我正在寻找的是一个类似的机制，使用信号或其他东西，将在提交后执行代码（如果事务失败，则不执行任何操作）。

I在Django中没有找到任何通用的方法。你有什么想法吗？

解决方案

更新2 ：django-transaction-hooks是合并到Django核心并在Django版本中发布1.9。

更新： django-transaction-hooks 解决了这个问题。

我不相信有一个干净的方法来做到这一点;至少我不能想到一个。您可以使用monkeypatch django.db.transaction.commit发送自定义信号;不太漂亮，但我认为这样会有效。

也可以在 django-developers邮件列表。开发人员通常厌恶添加新的信号，但您可能在这里有一个很好的例子（从核心开发人员的反驳可能包括一个有用的建议如何解决您的情况）。不过，如果您等到1.1出来之后，您可能会收到回复。

Is there any way to run some code after transaction commit in Django?

I need to send some messages to a rabbitmq server for offline processing, but the message gets to the consumer before the Django transaction is commited.

My message is sent in the post_save signal of the model. What I'm looking for is a similar mechanism, using signals or something else, that would execute code after the commit (and do nothing if the transaction fails).

I haven't found any generic way of doing it in Django. Do you have any ideas?

解决方案

UPDATE 2: django-transaction-hooks was merged into Django core and released in Django version 1.9.

UPDATE: django-transaction-hooks solves this problem.

I don't believe there is a clean way to do this; at least I can't think of one. You could monkeypatch django.db.transaction.commit to send a custom signal; not pretty but I think it would work.

Might also be interesting to raise this use-case on the django-developers mailing list. The devs are generally averse to adding new signals, but you might have a good case here (and a rebuttal from a core dev might include a useful suggestion of how to resolve your situation). You're more likely to get responses if you wait until after 1.1 comes out, though.

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