AttributeError: 'NoneType' object has no attribute 'group_add'
QuvonchbekBobojonov opened this issue · 1 comments
QuvonchbekBobojonov commented
I'm learning Django Chanel
import json
from asgiref.sync import async_to_sync
from channels.generic.websocket import WebsocketConsumer
class ChatConsumer(WebsocketConsumer):
def connect(self):
self.room_name = self.scope['url_route']['kwargs']['room_name']
self.room_group_name = 'chat_%s' % self.room_name
# Join room group
async_to_sync(self.channel_layer.group_add)(
self.room_group_name,
self.channel_name
)
self.accept()
def disconnect(self, close_code):
# Leave room group
async_to_sync(self.channel_layer.group_discard)(
self.room_group_name,
self.channel_name
)
# Receive message from WebSocket
def receive(self, text_data):
text_data_json = json.loads(text_data)
message = text_data_json['message']
# Send message to room group
async_to_sync(self.channel_layer.group_send)(
self.room_group_name,
{
'type': 'chat_message',
'message': message
}
)
# Receive message from room group
def chat_message(self, event):
message = event['message']
# Send message to WebSocket
self.send(text_data=json.dumps({
'message': message
}))
and
# chat/consumers.py
import json
from channels.generic.websocket import AsyncWebsocketConsumer
class ChatConsumer(AsyncWebsocketConsumer):
async def connect(self):
self.room_name = self.scope["url_route"]["kwargs"]["room_name"]
self.room_group_name = f"chat_{self.room_name}"
# Join room group
await self.channel_layer.group_add(self.room_group_name, self.channel_name)
await self.accept()
async def disconnect(self, close_code):
# Leave room group
await self.channel_layer.group_discard(self.room_group_name, self.channel_name)
# Receive message from WebSocket
async def receive(self, text_data):
text_data_json = json.loads(text_data)
message = text_data_json["message"]
# Send message to room group
await self.channel_layer.group_send(
self.room_group_name, {"type": "chat.message", "message": message}
)
# Receive message from room group
async def chat_message(self, event):
message = event["message"]
# Send message to WebSocket
await self.send(text_data=json.dumps({"message": message}))
Error
Traceback (most recent call last):
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/django/contrib/staticfiles/handlers.py", line 101, in __call__
return await self.application(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/routing.py", line 62, in __call__
return await application(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/security/websocket.py", line 37, in __call__
return await self.application(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/sessions.py", line 47, in __call__
return await self.inner(dict(scope, cookies=cookies), receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/sessions.py", line 263, in __call__
return await self.inner(wrapper.scope, receive, wrapper.send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/auth.py", line 185, in __call__
return await super().__call__(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/middleware.py", line 24, in __call__
return await self.inner(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/routing.py", line 116, in __call__
return await application(
^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/consumer.py", line 94, in app
return await consumer(scope, receive, send)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/consumer.py", line 62, in __call__
await await_many_dispatch([receive], self.dispatch)
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/utils.py", line 50, in await_many_dispatch
await dispatch(result)
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/consumer.py", line 73, in dispatch
await handler(message)
File "/Users/darklaki/Desktop/djnago-channels-learn/venv/lib/python3.12/site-packages/channels/generic/websocket.py", line 173, in websocket_connect
await self.connect()
File "/Users/darklaki/Desktop/djnago-channels-learn/chat/consumers.py", line 15, in connect
await self.channel_layer.group_add(self.room_group_name, self.channel_name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'group_add'
WebSocket DISCONNECT /ws/chat/hello/ [127.0.0.1:57473]
/Users/darklaki/Desktop/djnago-channels-learn/chat/consumers.py changed, reloading.
Afeez1131 commented
The error is pointing towards channel_layer to be having an attribute of NoneType, are you sure you added the CHANNEL_LAYERS in your settings.py file ??
something like
CHANNEL_LAYERS = {
"default": {
"BACKEND": "channels_redis.core.RedisChannelLayer",
"CONFIG": {
"hosts": [('localhost', 6379)],
}
}
}