尝试在两个外键约束上使用unique_together时,我收到以下错误:
CommandError: System check identified some issues:
ERRORS:
main.AuthorTag: (models.E012) 'unique_together' refers to the non-existent field 'author'.
main.AuthorTag: (models.E012) 'unique_together' refers to the non-existent field 'tag'.
在下表中
class AuthorTag(models.Model):
class Meta:
unique_together = (('tag', 'author',),)
tag = models.ForeignKey(TagIndex, on_delete=models.CASCADE),
author = models.ForeignKey(Author, on_delete=models.CASCADE),
同样的例子似乎在这里工作:Unique foreign key pairs with Django
但我无法弄清楚为什么我会收到这个错误
编辑:
将unique_together =((‘tag’,’author’,)改为unique_together =((‘tag’,’author’))给我同样的错误.以及在字段声明下面移动元类.
最佳答案 删除尾随逗号,使代码为:
class AuthorTag(models.Model):
class Meta:
unique_together = ['tag', 'author']
tag = models.ForeignKey(TagIndex, on_delete=models.CASCADE)
author = models.ForeignKey(Author, on_delete=models.CASCADE)
使它工作.我不确定为什么.