芹菜， 组任务， 属性错误： "NoneType" 对象没有属性 'app'

Question

我正在尝试运行一组芹菜任务如下:

@shared_task
def run_sms_task(smstask_id):
    smstask = SmsTask.objects.get(id = smstask_id)
    if smstask:
        phones = []
        for user in smstask.userlist.users.all():
           phones.append(user.profile.phone)
        g = group(send_sms_async(phone, smstask.text) for phone in phones)
        g.apply_async()
        smstask.status = 3
        smstask.save()

任务部分执行，最后抛出以下错误:

[2016-11-01 13:42:03,362: ERROR/MainProcess] Task sms_center.tasks.run_sms_task[d575fb59-6b0a-4ea6-851f-0902ef6bd7b9] raised unexpected: AttributeError("'NoneType' object has no attribute 'app'",)
Traceback (most recent call last):
  File "/home/alexander/.pyenv/versions/d/lib/python3.5/site-packages/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/home/alexander/.pyenv/versions/d/lib/python3.5/site-packages/celery/app/trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "/home/alexander/PycharmProjects/d/sms_center/tasks.py", line 25, in run_sms_task
    g.apply_async()
  File "/home/alexander/.pyenv/versions/d/lib/python3.5/site-packages/celery/canvas.py", line 502, in apply_async
    type = self.type
  File "/home/alexander/.pyenv/versions/d/lib/python3.5/site-packages/celery/canvas.py", line 569, in type
    return self.app.tasks[self['task']]
  File "/home/alexander/.pyenv/versions/d/lib/python3.5/site-packages/celery/canvas.py", line 560, in app
    return self._app or (self.tasks[0].app if self.tasks else current_app)
AttributeError: 'NoneType' object has no attribute 'app'

如果你有任何想法，欢迎帮助。谢谢你！

Answer 1

我发现了这个bug。我没有注意到Group是由Subtasks而不是Tasks创建的。正确的组创建方法是:

g = group(send_sms_async.s(phone, smstask.text) for phone in phones)

如果你遇到同样的问题，希望这个答案能节省你的时间!