In Rails, the closest I've seen to Django Signals are Observers. The problem with them is that they're restricted to triggering callbacks on hardcoded events related to a model's lifecycle.
在Rails中，我所见过的最接近Django信号的是观察者。它们的问题是，它们仅限于触发与模型生命周期相关的硬编码事件的回调。
Django signals can be created anywhere, triggered anywhere and handled anywhere. The model lifecycle callbacks are just regular signals that happen to come built-in and that are triggered by the ORM.
Django信号可以在任何地方创建、在任何地方触发和处理。模型生命周期回调只是内置的、由ORM触发的常规信号。
Does anyone know of a similarly general solution for Rails? It could be some generic Ruby library, not tied to Rails, which would be even better.
有人知道类似的Rails通用解决方案吗?它可以是一些通用的Ruby库，而不是绑定到Rails，这样会更好。
Edit: Observer is the closest thing, but it's not what I'm looking for. It's a one-to-many solution. Anyone can listen, but only the originating object can post. I'd like something where you declare a signal, and anyone can trigger it as well as handle it. Also, I don't like the fact that the Ruby Observer dictates that the handler have an #update method. I'd like to be able to pass any method reference with the appropriate signature.
编辑:观察者是最接近的东西，但它不是我想要的。这是一个一对多的解决方案。任何人都可以侦听，但只有原始对象可以发布。我想要一个你声明一个信号的东西，任何人都可以触发它，也可以处理它。另外，我不喜欢Ruby观察者告诉处理程序有一个#update方法。我希望能够通过适当的签名传递任何方法引用。
I could use the Ruby Observer to implement my own such broker, but I'm trying to learn if someone already did it.
我可以使用Ruby观察者来实现我自己的代理，但是我正在尝试了解是否有人已经这样做了。
5 个解决方案
#1
3
I think a closer equivalent than Rails' Observer is the standard Ruby Observable module. It lets you add a list of observers to an object and the object can then send notifications to the observers when it changes.
我认为比Rails的观察者更接近的是标准的Ruby可观察模块。它允许向对象添加一个观察者列表，然后当对象发生更改时，对象可以向观察者发送通知。
#2
1
What about the 'wisper' gem? https://github.com/krisleech/wisper
那“wisper”宝石呢?https://github.com/krisleech/wisper
Wisper is a Ruby library for decoupling and managing the dependencies of your Ruby objects using Pub/Sub.
Wisper是一个使用Pub/Sub来解耦和管理Ruby对象依赖关系的Ruby库。
It is commonly used as an alternative to ActiveRecord callbacks and Observers to reduce coupling between data and domain layers.
它通常被用作ActiveRecord回调和观察者的替代，以减少数据和域层之间的耦合。
#3
0
Perhaps acts_as_state machine will help. Most of this functionality has recently been baked into Rails edge.
也许acts_as_state机器会有所帮助。这个功能的大部分最近都被集成到了Rails edge中。
#4
0
I just implemented a gem with that. https://github.com/pkoch/django_signal/
我刚刚实现了一个宝石。https://github.com/pkoch/django_signal/
#5
0
Ruby gem 'watchable' is the most appropriate choice https://github.com/jbarnette/watchable
Ruby gem“watchable”是最合适的选择:https://github.com/jbarnette/watchable
It has a syntax that is very familiar to Django's (and other frameworks, like Qt and many others).
它具有Django非常熟悉的语法(以及其他框架，如Qt和许多其他框架)。
#1
3
I think a closer equivalent than Rails' Observer is the standard Ruby Observable module. It lets you add a list of observers to an object and the object can then send notifications to the observers when it changes.
我认为比Rails的观察者更接近的是标准的Ruby可观察模块。它允许向对象添加一个观察者列表，然后当对象发生更改时，对象可以向观察者发送通知。
#2
1
What about the 'wisper' gem? https://github.com/krisleech/wisper
那“wisper”宝石呢?https://github.com/krisleech/wisper
Wisper is a Ruby library for decoupling and managing the dependencies of your Ruby objects using Pub/Sub.
Wisper是一个使用Pub/Sub来解耦和管理Ruby对象依赖关系的Ruby库。
It is commonly used as an alternative to ActiveRecord callbacks and Observers to reduce coupling between data and domain layers.
它通常被用作ActiveRecord回调和观察者的替代，以减少数据和域层之间的耦合。
#3
0
Perhaps acts_as_state machine will help. Most of this functionality has recently been baked into Rails edge.
也许acts_as_state机器会有所帮助。这个功能的大部分最近都被集成到了Rails edge中。
#4
0
I just implemented a gem with that. https://github.com/pkoch/django_signal/
我刚刚实现了一个宝石。https://github.com/pkoch/django_signal/
#5
0
Ruby gem 'watchable' is the most appropriate choice https://github.com/jbarnette/watchable
Ruby gem“watchable”是最合适的选择:https://github.com/jbarnette/watchable
It has a syntax that is very familiar to Django's (and other frameworks, like Qt and many others).
它具有Django非常熟悉的语法(以及其他框架，如Qt和许多其他框架)。