How to update ManyToManyField field?

Question

Django

Good evening. Tell me how can I update the tasks = models.ManyToManyField(Task) field in the User model . I get PATCH in GenericViewSet , mixins.UpdateModelMixin , with data - task_id . How can I update only the tasks field in the User model ? Thank you in advance. Stuck on this:

@action(detail=False, methods=['PATCH'], permission_classes=[IsAuthenticated])
    def task_in_user_update():
        task_id = int(request.data.get('task_id'))
        answer = str(request.data.get('answer'))
        user_id = int(request.user.id)

        if not task_id or not answer:
            return Response(status=status.HTTP_204_NO_CONTENT)

I did not see in the documentation how this is implemented.