docs: def comment_set(self):
          """ Get the comments that have been submitted for the chat
          """
          ct = ContentType.objects.get_for_model(self.__class__)
          qs = Comment.objects.filter(
              content_type=ct,
              object_pk=self.pk)
          qs = qs.exclude(is_removed=True)
          qs = qs.order_by('-submit_date')
          return qs