如果我们在 django 频道中收到新消息，如何删除以前的消息

Question

我想在特定房间广播 Django-channel 层的唯一最新消息。现在我已经为特定用户创建了特定的房间名称。现在我只想向他们发送最新消息或注释，我不想显示所有以前的消息。现在所有以前的消息都显示给用户。

    # chat/consumers.py
import json
from channels.generic.websocket import AsyncWebsocketConsumer

class ProjectConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        parameter = self.scope['url_route']['kwargs']["project_key"]
        print("url_parameter ",parameter)
        
        self.room_name = parameter

        # Join room group
        await self.channel_layer.group_add(
            self.room_name,
            self.channel_name
        )

        await self.accept()

    async def disconnect(self, close_code):
        # Leave room group
        await self.channel_layer.group_discard(
            self.room_name,
            self.channel_name
        )

    # Receive message from WebSocket
    async def receive(self, text_data):
        text_data_json = json.loads(text_data)

        instance_user = text_data_json['instance_user']
        sender = text_data_json['sender']
        receiver =  text_data_json['receiver']
        message = text_data_json['message']

        object = {
            'sender':sender,
            'receiver':receiver,
            'message':message,
        }
        # Send message to room group
        await self.channel_layer.group_send(
            self.room_name,
            {
                'type': 'sent', #function name as an event type
                'object': object #function parameters as an event object
            }
        )

    # Receive message from room group
    async def sent(self, event):

        sender = event['object']["sender"]
        receiver = event['object']["receiver"]
        message = event['object']["message"]

        # Send message to WebSocket
        await self.send(text_data=json.dumps({
            'sender':sender,
            'receiver':receiver,
            'message':message,
        }))

Answer 1

Channel_layer 只广播可用的消息，您可能正在将消息附加到前端的 DOM 元素中