How to use the djangochannelsrestframework.mixins.UpdateModelMixin function in djangochannelsrestframework

async def test_update_mixin_consumer():

    class UserSerializer(serializers.ModelSerializer):
        class Meta:
            model = get_user_model()
            fields = ('id', 'username', 'email',)

    class AConsumer(UpdateModelMixin, GenericAsyncAPIConsumer):
        queryset = get_user_model().objects.all()
        serializer_class = UserSerializer

    assert not get_user_model().objects.all().exists()

    # Test a normal connection
    communicator = WebsocketCommunicator(AConsumer, "/testws/")
    connected, _ = await communicator.connect()
    assert connected

    await communicator.send_json_to(
        {
            "action": "update",
            "pk": 100,
            "data": {
                "username": "test101",