I’m using DjangoRestChannels (based on Django Channels). I made a simple comments page. When new Comment added by any User instance consumer sends in to JS and renders on HTML.
Everything works exceps when User instance gets deleted I’m getting exception django.core.exceptions.SynchronousOnlyOperation: You cannot call this from an async context - use a thread or sync_to_async.

Consumers:

class CommentConsumer(ListModelMixin, GenericAsyncAPIConsumer):
    queryset = (
        Comment.objects.filter(level=0)
        .select_related("user", "parent")
        .prefetch_related("children")
        .order_by("-date_created")
        )
    serializer_class = CommentSerializer
    permission_classes = (AllowAny, )

    @action()
    async def subscribe_to_comment_activity(self, request_id, **kwargs):
        await self.comment_activity.subscribe(request_id=request_id)

    @model_observer(Comment)
    async def comment_activity(
        self,
        message: NewCommentSerializer,
        observer=None,
        subscribing_request_ids=[],
        **kwargs
    ):
        await self.send_json(dict(message.data))

    @comment_activity.serializer
    def comment_activity(self, instance: Comment, action, **kwargs) -> NewCommentSerializer:
        """Returns the comment serializer"""
        return NewCommentSerializer(instance)

Model:

class Comment(MPTTModel):
    """ The base model represents comment object in db. """

    user = models.ForeignKey(CustomUser, related_name="comments", on_delete=models.CASCADE)
    parent = TreeForeignKey(
        "self",
        blank=True,
        null=True,
        related_name="children",
        on_delete=models.SET_NULL
    )
    date_created = models.DateTimeField(
        verbose_name="Created at",
        auto_now_add=True,
        blank=True,
        null=True
    )
    text = models.TextField(max_length=500)

In terminal exception tracing don’t help me much as among all the exception lines my code was only : await self.send_json(dict(message.data)) in Consumer method async def comment_activity.
Any guess regarding this topic? Appreciate any help.