Django：基本模型信号处理程序不会触发-Django:basemodelsignalhandlerdoesn'tfire

6  

There's an open ticket about this, #9318.

有关于此的公开票,#9318。

Your workaround looks fine. Here are two others suggested on the ticket by benbest86 and alexr respectively.

你的解决方法看起来很好。以下是benbest86和alexr分别在票上建议的其他两个。

1. Listen on the child class signal, and send the Parent signal there.

   听取子类信号,并在那里发送父信号。

   def call_parent_pre_save(sender, instance, created, **kwargs):
       pre_save.send(sender=Parent, instance=Parent.objects.get(id=instance.id), created=created, **kwargs)
   pre_save.connect(call_parent_pre_save, sender=Child)
   

2. Do not specify the sender when connecting the signal, then check for subclasses of parent.

   连接信号时不要指定发送方,然后检查父类的子类。

   def pre_save_parent(sender, **kwargs):
       if not isinstance(instance, Parent):
           return
       #do normal signal stuff here
       print "pre_save_parent"
   
   pre_save.connect(pre_save_parent)
   

2  

I didn't realise sender was an optional parameter to connect. I can do the following:

我没有意识到sender是一个可选的连接参数。我可以做以下事情:

def pre_save_handler(**kwargs):
    instance = kwargs['instance']
    if hasattr(instance, 'pre_save'):
        instance.pre_save()
pre_save.connect(pre_save_handler)

This allows me to write per Model pre_save methods, and they in turn can call any base class versions (if they exists).

这允许我按照模型pre_save方法编写,然后它们可以调用任何基类版本(如果它们存在)。

Any better solutions?

更好的解决方案?