Get the comments that have been submitted for the chat

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