Rails:around_* 回调 [英] Rails: around_* callbacks

问题描述

我已阅读 http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html 上的文档，但不明白什么时候 around_* 回调与 before_* 和 after_* 相关.

I have read the documentation at http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html, but don't understand when the around_* callbacks are triggered in relation to before_* and after_*.

非常感谢任何帮助.

谢谢.

推荐答案

around_* 回调在动作之前被调用，然后当你想调用动作本身时，你yield 给它，然后继续执行.这就是为什么它被称为around

around_* callbacks are invoked before the action, then when you want to invoke the action itself, you yield to it, then continue execution. That's why it's called around

顺序是这样的:before，around，after.

因此，典型的 around_save 如下所示:

So, a typical around_save would look like this:

def around_save
   #do something...
   yield #saves
   #do something else...
end

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