Django信号无法正常工作 [英] Django signals not working properly

问题描述

我正在尝试设置一个信号，以便在保存有效的表单时，运行一个函数来执行相关任务。

我的应用程序结构是如下;

   - 事件
  - 帮助者
  -  __init__.py 
  - 状态。 py 
  - 模型
  - 信号
  -  __init__.py 
  -  event.py 
  -  __init__.py 
  -  event.py 
  - status.py 
  - 视图
  -  __init__.py 
  -  event.py 
  

$ b $我相信信号需要在模型之前尽可能早地导入，所以在模型/ __ init __。py 的顶部我有 from .signals import * 。

 ＃views / event.py 
 class AddEventView（CreateView）：

添加事件的视图

 model = Event 
 form_class = EventForm 
 success_url = reverse_lazy （'events：all_events'）
 
 def form_valid（self，form）：
 self.object = form.save（）
 
 signals.event_status.send（
 sender = None，request = self.request，event = self.object，status =无
）＃发件人应该是self.object吗？ 
 
返回超级（AddEventView，self）.form_valid（form）
 
＃signals / event.py 
 from django.dispatch import Signal 
 event_status =信号（provide_args = [request，event，status]）
 
＃helpers / status.py 
 from ..models import Status，StatusHistory 
 from。 .models.signals import event_status 
 
 
 def create_status（sender，** kwargs）：

为给定的事件创建一个状态

 event = kwargs ['event'] 
 status = kwargs ['status'] 
 creator = User.objects.get（pk = event.creator）
尝试：
 current_status = StatusHistory.objects.filter（
 event = event）.order_by（'timestamp'）[0] 
除了IndexError：
＃不知道我们是还在这里
 pass 
如果不是状态：
 status = Status.objects.get（description = _（Submitted））
 
 statushistory = StatusHistory.create（
 event = event，
 event_status = status，
 user = creator 
）
 statushistory.save（）
 
 event_status.connect（create_status）
  

我在Pycharm中运行调试服务器，在 create_status中有一个断点（） function&

解决方案

>我想也许你只需要导入你的 helpers / status.py ，例如在 models / __ init __。py p>

否则你的 event_status 信号被定义好，但信号处理程序 create_status 永远不会被Django连接

如果您只有一个该信号的处理程序，将它放在与信号定义相同的模块中可能是有意义的

I'm trying to setup a signal so that when a valid form is saved, a function is ran to carry out a related task.

My app structure is as follows;

- events
    - helpers
        - __init__.py
        - status.py
    - models
        - signals
            - __init__.py
            - event.py
        - __init__.py
        - event.py
        - status.py
    - views
        - __init__.py
        - event.py

I believe signals need to be imported as early as possible, before models, so at the top of models/__init__.py I've got from .signals import *.

# views/event.py
class AddEventView(CreateView):
    """
    View for adding an Event.
    """
    model = Event
    form_class = EventForm
    success_url = reverse_lazy('events:all_events')

    def form_valid(self, form):
        self.object = form.save()

        signals.event_status.send(
            sender=None, request=self.request, event=self.object, status=None
        ) # Should the sender be self.object?

        return super(AddEventView, self).form_valid(form)

# signals/event.py
from django.dispatch import Signal
event_status = Signal(providing_args=["request", "event", "status"])

# helpers/status.py
from ..models import Status, StatusHistory
from ..models.signals import event_status


def create_status(sender, **kwargs):
    """
    Create a status for a given event.
    """
    event = kwargs['event']
    status = kwargs['status']
    creator = User.objects.get(pk=event.creator)
    try:
        current_status = StatusHistory.objects.filter(
            event=event).order_by('timestamp')[0]
    except IndexError:
        # Not sure what we're doing here yet.
        pass
    if not status:
        status = Status.objects.get(description=_("Submitted"))

    statushistory = StatusHistory.create(
        event=event,
        event_status=status,
        user=creator
    )
    statushistory.save()

event_status.connect(create_status)

I'm running the debug server in Pycharm with a break point in the create_status() function & it's never getting hit.

Have I implemented this wrong?

解决方案

I think maybe you just need to import your helpers/status.py eg in models/__init__.py

otherwise your event_status signal gets defined ok but the signal handler create_status never gets connected by Django

if you only have one handler for that signal it might make sense to put it in the same module as the signal definition

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