将变量传递给 Rails StateMachine gem 转换

问题描述

是否可以在转换中发送变量?即

Is it possible to send variables in the the transition? i.e.

@car.crash!(:crashed_by => current_user)

我的模型中有回调，但我需要将发起转换的用户发送给他们

I have callbacks in my model but I need to send them the user who instigated the transition

after_crash do |car, transition|
  # Log the car crashers name
end

我无法访问 current_user 因为我在模型中而不是控制器/视图中.

I can't access current_user because I'm in the Model and not the Controller/View.

在你说出来之前......我知道我知道.

And before you say it... I know I know.

不要尝试访问模型中的会话变量

我明白了.

然而，每当您希望创建一个回调来记录或审核某些内容时，您很可能想知道是谁引起的?通常我会在我的控制器中做一些类似的事情......

However, whenever you wish to create a callback that logs or audits something then it's quite likely you're going to want to know who caused it? Ordinarily I'd have something in my controller that did something like...

@foo.some_method(current_user)

我的 Foo 模型会期望一些用户发起 some_method 但我如何通过 StateMachine gem 的转换来做到这一点?

and my Foo model would be expecting some user to instigate some_method but how do I do this with a transition with the StateMachine gem?

推荐答案

如果您指的是 state_machine gem - https://github.com/pluginaweek/state_machine - 然后它支持事件的参数

If you are referring to the state_machine gem - https://github.com/pluginaweek/state_machine - then it supports arguments to events

after_crash do |car, transition|
  Log.crash(car: car, crashed_by: transition.args.first)
end

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