我有“Project”和“Room”模型。每个项目都有自己的聊天室。我想使用Django频道。不幸的是，我有错误。我想念的是什么，以及如何解决这个错误。
错误：
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.
urls.py ：
url(r'^(?P<project_code>[0-9a-f-]+)/chat_room/$', chat_room, name='chat_room'),
settings.py ：
CHANNEL_LAYERS = {
"default": {
"BACKEND": "asgi_redis.RedisChannelLayer",
"CONFIG": {
"hosts": [os.environ.get('REDIS_URL', 'redis://localhost:6379')],
},
"ROUTING": "chat.routing.channel_routing",
},
}
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}
views.py ：
def chat_room(request, project_code):
# If the room with the given project_code doesn't exist, automatically create it upon first visit.
room, created = Room.objects.get_or_create(project=project_code)
# We want to show the last 50 messages, ordered most-recent-last
messages = reversed(room.messages.order_by('-timestamp')[:50])
return render(request, "project/chat/room.html", {
'room': room,
'messages': messages,
})
consumers.py ：
@channel_session
def ws_connect(message):
prefix, project_code = message['path'].strip('/').strip('/').strip('/').strip('/').strip('/').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)
routing.py ：
channel_routing = [
route("websocket.connect", ws_connect),
route("websocket.receive", ws_receive),
route("websocket.disconnect", ws_disconnect),
]
chat.js ：
$(document).ready(function(){
socket = new WebSocket("ws://" + window.location.host + "/chat" + window.location.pathname);
var name = "";
swal({
title: 'Your name:',
input: 'text',
inputValidator: function (value) {
return new Promise(function (resolve, reject) {
if (value) {
resolve()
} else {
reject('You need to write something!')
}
})
}
}).then(function (result) {
name = result;
swal({
type: 'success',
html: 'Hello ' + result
})
});
socket.onopen = function(){
$('#chatform').on('submit', function(event) {
var message = {
handle: name,
message: $('#message').val(),
}
socket.send(JSON.stringify(message));
$('#message').val('');
return false;
});
}
socket.onmessage = function(message) {
var data = JSON.parse(message.data);
$('#chat').append('<tr>'
+ '<td>' + data.timestamp + '</td>'
+ '<td>' + data.handle + '</td>'
+ '<td>' + data.message + ' </td>'
+ '</tr>');
Push.create("Django Channels Example | " + room , {
body: "New Message",
icon: 'http://pa1.narvii.com/6184/91c955faf54e625b3467093bea75a6d25b813871_128.gif',
timeout: 4000,
onClick: function () {
window.focus();
this.close();
}
});
};
if (socket.readyState == WebSocket.OPEN) socket.onopen();
});