Django数据库模型"unique_together"不起作用？

Question

我希望我的ip和stream_id组合是独一无二的,所以我写了这个模型:

# Votes
class Vote(models.Model):
    # The stream that got voted
    stream = models.ForeignKey(Stream)

    # The IP adress of the voter
    ip = models.CharField(max_length = 15)

    vote = models.BooleanField()

    unique_together = (("stream", "ip"),)

但由于某种原因,它产生了这个表,跳过了 ip

mysql> SHOW CREATE TABLE website_vote;
+--------------+---------------------------------------------+
| Table        | Create Table                                |
+--------------+---------------------------------------------+
| website_vote | CREATE TABLE `website_vote` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `stream_id` int(11) NOT NULL,
  `ip` varchar(15) NOT NULL,
  `vote` tinyint(1) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `website_vote_7371fd6` (`stream_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 |
+--------------+---------------------------------------------+
1 row in set (0.00 sec)

为什么它不包含ip在钥匙中？为了记录,我知道unique_together可以在不嵌套元组的情况下编写该行,但这与该问题无关

Answer 1

unique_together需要在模型Meta类中.查看文档.

class Vote(models.Model):
    # The stream that got voted
    stream = models.ForeignKey(Stream)

    # The IP adress of the voter
    ip = models.CharField(max_length = 15)

    vote = models.BooleanField()

    class Meta:
        unique_together = (("stream", "ip"),)

此外,还有一个内置的IPAddressField模型字段.请参阅此处的文档.