class User(AbstractUser):
    class Meta:
        verbose_name = 'пользователь'
        verbose_name_plural = 'пользователи'

    phone = models.CharField('номер телефона', max_length=127, blank=True)

    @models.permalink
    def get_absolute_url(self):
        return 'user-detail', (self.pk,)

    def __str__(self):
        name = self.get_full_name()
        if not name:
            name = self.username
        return name