class Image(models.Model):
    flat = models.ForeignKey(
        Flat, verbose_name='Квартира', related_name='photos',
        on_delete=models.CASCADE, blank=True, null=True,
    )
    image = models.ImageField(upload_to='photos/%Y/%m/%d/')

    def __str__(self):
        return str(self.image)

    def get_absolute_url(self):
        return 'media/photos/' + str(self.image)

    class Meta:
        verbose_name = 'Фотография'
        verbose_name_plural = 'Фотографии'