Question

我的消费者。py：

Content

我的信号。py：

    async def user_taskcompleted(self, event):
     me = User.objects.get(username=event['username'])

     print("ME",me)
     mentor=me.mentor
     print("MY MENTOR", mentor)
     id_task =event['task']
     print("GETTING ID",id_task)
     notification = event['username'] + ' Completed new Task ' + 
     event['title']
     print("notification", notification)

     task = await Task.objects.get(id=id_task)


     obj =  
     await self.create_notification_to_trainer(me,notification,task)
     obj.receiver.add(mentor)
     await self.send_json(event)
     print("Got message {} at {}".format(event, self.channel_name))


  @database_sync_to_async
  def create_notification_to_trainer(self, sender,notification,task):

    return Notification.objects.create(sender=sender 
    ,notification=notification,task=task)

我正在尝试将数据保存到我的consumers.py中的模型中以在保存任务时保存通知。问题是我无法使用我的consumers.py中的任务ID来获取任务。它显示了任务匹配查询在我的终端机中不存在。

我的终端中显示了所有其他字段的打印语句，即时消息还能够获取返回的正确任务ID

如我的终端所示：

@receiver(post_save, sender=Task)
def create_task_notification(sender, instance, created, **kwargs):
if  Task.objects.filter
(student=instance.student,student__mentor__isnull=False).exists():
if created:
    channel_layer = get_channel_layer()
    async_to_sync(channel_layer.group_send)(
        "gossip", {"type": "user.taskcompleted",
                   "event": "New Task",
                   "task": instance.id,
                   "username": instance.student.username,

                   "title": instance.title,
                   "mentor": instance.student.mentor.username

                   })

          print("TASK  ID",instance.id)
  else:
      print("NO TRAINER")

该错误显示在Task.objects.get（id = id_task）

Answer 1

如果您在async方法中运行，则需要将ORM DB调用包装在await database_sync_to_async

中

from channels.db import database_sync_to_async

async def user_taskcompleted(self, event):
     me = await database_sync_to_async(User.objects.get)(username=event['username'])
     ...

查看关于此here

的完整文档

P.S如果您有兴趣观察Model实例，请查看Django Channels Rest Framework [Disclamer我是主要贡献者的作者]

Answer 2

使用asyncio.sleep解决了该问题

ret = f'Done! {deleted} entr{deleted != 1 and "ies were" or "y was"} removed.'

Django通道中的异步等待无法获取ID为的对象

2 个答案: