了解Rails 4中的after_update回调 [英] Understanding after_update callback in Rails 4

问题描述

我有一个带有 after_update 回调的Rails对象，该回调将记录发送到队列。问题是我发现有时队列的处理速度比对象实际更新的速度快。

I have a Rails object with after_update callback that sends a record to a queue. And the problem is that I noticed sometimes the queue is being processed faster than the object is actually being updated.

我的问题是： after_update 不是在对象更新结束后调用，而是在它开始时调用？如果我只想在成功完成后做某事，该怎么做？

My question: is after_update called not after the object updating ended, but when it started? What callback I need if I want to do something with it only after update is successful?

推荐答案

在事务块内调用 after_save ， after_create ， after_update ，因此它们将在执行SQL语句之前执行。

after_save, after_create, after_update are called within the transaction block, so they will be executed before executing the SQL statement.

如果要在语句执行完成后执行某些操作，则应使用 after_commit 回调。

If you want to do something when the statement execution is completed, you should use after_commit callback.

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