Django unique_together的子类模型为父属性？ [英] Django unique_together on sub-class model for parent attribute?

问题描述

在这里：

class Administrator(models.Model):
    user = models.OneToOneField(User, primary_key=True)
    account = models.ForeignKey(Account)

    class Meta:
        unique_together = (('account', 'self.user.username'),)

self.user.username 部分显然incorrrect。但是，在这里：

The self.user.username part is obviously incorrrect. However, in this:

class Administrator(User):
    account = models.ForeignKey(Account)

    class Meta:
        unique_together = (('account', 'username'),)

会继续使用User吗？ （我不能测试它，因为有太多的元素不在其他地方）。可以使用'user.username'的第一个版本吗？或者，我应该使用第二个版本吗？

would that work since I'm inheriting from User? (I can't test it yet because there are too many elements out of place elsewhere). Can I use the first version with 'user.username' instead though? Or, should I use the second version?

推荐答案

这将是

unique_together = (('account', 'user__username'),)

$ b $如果我明白你想做什么，那么b

注意双下划线。这是你如何看外键的对象的属性。

if I understand what you're trying to do. Note the double underscore. That's how you look at a foreign key's object's properties.

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