fields.E304 Django中的反向访问器冲突

时间:2017-01-11 16:00:42

标签: django

我正在尝试迁移这两个模型:

# models.py

from django.db import models


class Person(models.Model):
    name = models.CharField(max_length=64)


class Person2Person(models.Model):
    person = models.ForeignKey(Person)
    friend = models.ForeignKey(Person)

但我有这个错误:

SystemCheckError: System check identified some issues:

ERRORS:
website.Person2Person.friend: (fields.E304) Reverse accessor for 'Person2Person.friend' clashes with reverse accessor for 'Person2Person.person'.
    HINT: Add or change a related_name argument to the definition for 'Person2Person.friend' or 'Person2Person.person'.
website.Person2Person.person: (fields.E304) Reverse accessor for 'Person2Person.person' clashes with reverse accessor for 'Person2Person.friend'.
    HINT: Add or change a related_name argument to the definition for 'Person2Person.person' or 'Person2Person.friend'.

我想在模型Person中建立多对多的关系。为什么我的代码错了?我该如何解决?

1 个答案:

答案 0 :(得分:13)

代码错误,因为Person会得到一个反向关系回Person2Person.person,也回到Person2Person.friend;默认名称是Person.person2person_set,但Django不能为两者使用相同的名称。

因此,您可以在其中一个或两个上设置related_name

class Person2Person(models.Model):
    person = models.ForeignKey(Person, related_name='person2persons')
    friend = models.ForeignKey(Person, related_name='friends')

现在Person.friends与Person2Person对象相关,Person2Person对象将此Person作为朋友,Person.person2person与以此Person为人的对象相关。

然而,为什么你没有在Person上使用ManyToManyField到'self'