New chat message notification Django Channels

Question

I\'ve got Django Channels 2.1.2 set up in my Django app by following a tutorial and now need to set up a notification system for new messages. I want to do this

Answer 1

I couldn't mark this as a duplicate, because there is a bounty on it. But the solution is, you need more than two models. According to this post, your models.py should look something like this:

class MessageThread(models.Model):
    title = models.CharField()
    clients = models.ManyToManyField(User, blank=True)

class Message(models.Model):
    date = models.DateField()
    text = models.CharField()
    thread = models.ForeignKey('messaging.MessageThread', on_delete=models.CASCADE)
    sender = models.ForeignKey(User, on_delete=models.SET_NULL)

Your consumers.py should look like this:

class ChatConsumer(WebSocketConsumer):
    def connect(self):
        if self.scope['user'].is_authenticated:
            self.accept()
            # add connection to existing groups
            for thread in MessageThread.objects.filter(clients=self.scope['user']).values('id'):
                async_to_sync(self.channel_layer.group_add)(thread.id, self.channel_name)
            # store client channel name in the user session
            self.scope['session']['channel_name'] = self.channel_name
            self.scope['session'].save()

    def disconnect(self, close_code):
        # remove channel name from session
        if self.scope['user'].is_authenticated:
            if 'channel_name' in self.scope['session']:
                del self.scope['session']['channel_name']
                self.scope['session'].save()
            async_to_sync(self.channel_layer.group_discard)(self.scope['user'].id, self.channel_name)