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Django Signals

1.什么是signal?    在特定事件发生时, 使用signal 发送者 能够通知一系列 接收者(一个或者多个).    python 本身没有类似机制的支持, 但是 django 基于 PyDispatcher 进行了性能 和代码结构上的优化来增加了signal功能.2.使用signal 2.1. 代码结构        ├── manage.py        ├── signalapp        │   ├── __init__.py        │   ├── models.py        │   ├── signals.py        │   ├── tests.py        │   ├── urls.py        │   ├── views.py        ├── signaltest        │   ├── __init__.py        │   ├── settings.py        │   ├── urls.py        │   ├── wsgi.py        └── yann 2.2. 注册signal

        import django.dispatch        save_done = django.dispatch.Signal(providing_args=[‘obj‘])

 2.3关联signal到对应的listener

     fromDjango.dbImportModelsImportSignals#引入文件     class article(models. Model):title = models. Charfield (max_length= $) content = models. TextField () Is_public = models. Booleanfield (default=True, blank=True) def send(self):Signals.save_done.send (Sender=article, obj=self)#关联 sender=article, which restricts the event to be triggered only when article has an update.          def __unicode__(self):            returnSelf.title def chufa_func(sender, **kwargs):            Print "SIGNAL"            if "obj" inchKwargs:obj = Kwargs.get ("obj") Signals.save_done.connect (chufa_func,sender=article)

   2.4触发监听事件

    article = Article(title="", content="")      article.send

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