如何在 Django 中为我的模型设置两个主键字段

问题描述：

我有一个这样的模型:

class Hop(models.Model):
    migration = models.ForeignKey('Migration')
    host = models.ForeignKey(User, related_name='host_set')

我希望主键是 migration 和 host 的组合.

I want the primary key to be the combination of migration and host.

答

我的实现方式略有不同.

I would implement this slightly differently.

我会使用默认主键(自动字段)，并使用元类属性，unique_together

I would use a default primary key (auto field), and use the meta class property, unique_together

class Hop(models.Model):
    migration = models.ForeignKey('Migration')
    host = models.ForeignKey(User, related_name='host_set')

    class Meta:
        unique_together = (("migration", "host"),)

它将充当代理"主键列.

It would act as a "surrogate" primary key column.

如果你真的想创建一个多列主键，看看这个应用

If you really want to create a multi-column primary key, look into this app

如何在 Django 中为我的模型设置两个主键字段

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