如何订阅django channels rest框架中模型的所有实例？

# consumers.py

from channels.generic.websocket import AsyncWebsocketConsumer
from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from myapp.models import MyModel
import json

class MyConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        # 订阅模型实例的创建和删除事件
        post_save.connect(self.handle_model_instance, sender=MyModel)
        post_delete.connect(self.handle_model_instance, sender=MyModel)

        # 接受WebSocket连接
        await self.accept()

    async def disconnect(self, close_code):
        # 取消订阅模型实例的事件
        post_save.disconnect(self.handle_model_instance, sender=MyModel)
        post_delete.disconnect(self.handle_model_instance, sender=MyModel)

    @receiver([post_save, post_delete], sender=MyModel)
    def handle_model_instance(sender, instance, **kwargs):
        # 将模型实例的相关信息发送给客户端
        data = {
            'id': instance.id,
            'name': instance.name,
            # 其他字段...
        }
        self.send(json.dumps(data))