raise NotImplementedError('Lesmianator continuations: only Book and Tag supported')
c, created = cls.objects.get_or_create(content_type=object_type, object_id=sth.id)
raise NotImplementedError('Lesmianator continuations: only Book and Tag supported')
c, created = cls.objects.get_or_create(content_type=object_type, object_id=sth.id)