Пытаюсь создать групповой чат с помощью Django Channels. Есть модель Project(Проект). В каждом проекте должен быть групповой чат, где члены проекта могли бы вести обсуждение. К сожалению возникла ошибка и я не имею понятия где именно сделал ошибку. Что я делаю неправильно, что упустил? И как правильно создать групповой чат в Django чтобы была привязка в определенному проекту по его id(в моем случаи project_code).
models.py:
class Room(models.Model):
project = models.ForeignKey(Project, on_delete=models.CASCADE)
code = models.UUIDField(_('Code'), primary_key=True, default=uuid.uuid4, editable=False)
def __str__(self):
return self.code
def get_absolute_url(self):
return reverse('project:chat_room', args=[self.project_code])
class Message(models.Model):
room = models.ForeignKey(Room, related_name='messages')
handle = models.TextField()
message = models.TextField()
timestamp = models.DateTimeField(default=timezone.now, db_index=True)
def __unicode__(self):
return '[{timestamp}] {handle}: {message}'.format(**self.as_dict())
def __str__(self):
return self.__unicode__()
@property
def formatted_timestamp(self):
return self.timestamp.strftime('%b %-d %-I:%M %p')
def as_dict(self):
return {'handle': self.handle, 'message': self.message, 'timestamp': self.formatted_timestamp}
urls.py:
url(r'^(?P<project_code>[0-9a-f-]+)/chat_room/$', chat_room, name='chat_room'),
views.py:@login_required
def chat_room(request, project_code):
room, created = Room.objects.get_or_create(project=project_code)
messages = reversed(room.messages.order_by('-timestamp')[:50])
return render(request, "project/chat/room.html", {'room': room, 'messages': messages,})
routing.py:
channel_routing = [
route('websocket.connect', ws_connect),
route("websocket.receive", ws_receive),
route("websocket.disconnect", ws_disconnect),
]
consumers.py:
@channel_session
def ws_connect(message):
prefix, project_code = message['path'].strip('/')
room = Room.objects.get(project=project_code)
message.reply_channel.send({"accept": True})
Group('chat-' + project_code).add(message.reply_channel)
message.channel_session['room'] = room.project
@channel_session
def ws_receive(message):
project_code = message.channel_session['room']
room = Room.objects.get(project=project_code)
data = json.loads(message['text'])
m = room.messages.create(handle=data['handle'], message=data['message'])
Group('chat-' + project_code).send({'text': json.dumps(m.as_dict())})
@channel_session
def ws_disconnect(message):
project_code = message.channel_session['room']
Group('chat-' + project_code).discard(message.reply_channel)
settings.py:
CHANNEL_LAYERS = {
"default": {
"BACKEND": "asgi_redis.RedisChannelLayer",
"CONFIG": {
"hosts": [os.environ.get('REDIS_URL', 'redis://localhost:6379')],
},
"ROUTING": "RMS.routing.channel_routing",
},
}
ERROR:Traceback (most recent call last):
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 473, in get_or_create
return self.get(**lookup), False
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 385, in get
self.model._meta.object_name
project.models.DoesNotExist: Room matching query does not exist.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\exception.py", line 39, in inner
response = get_response(request)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\channels\handler.py", line 237, in process_exception_by_middleware
return super(AsgiHandler, self).process_exception_by_middleware(exception, request)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\contrib\auth\decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "C:\Users\Nurzhan\PycharmProjects\RMS\project\views.py", line 176, in chat_room
room, created = Room.objects.get_or_create(project=project_code)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 475, in get_or_create
return self._create_object_from_params(lookup, params)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 505, in _create_object_from_params
obj = self.create(**params)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\query.py", line 397, in create
obj = self.model(**kwargs)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\base.py", line 537, in __init__
setattr(self, field.name, rel_obj)
File "C:\Users\Nurzhan\AppData\Local\Programs\Python\Python35-32\lib\site-packages\django\db\models\fields\related_descriptors.py", line 211, in __set__
self.field.remote_field.model._meta.object_name,
ValueError: Cannot assign "'1744d0bc-e439-4562-9c29-4e7b2451f39c'": "Room.project" must be a "Project" instance.
Средний
