django - 外键作为 Django 1.5 可配置用户模型上的必填字段，createsuperuser 表示 : AttributeError: 'NoneType' object has no attribute '_state'

Question

使用新 Configurable user model从 Django 1.5 (1, 5, 0, 'beta', 2) 运行 manage.py createsuperuser 时出现此错误尝试设置必填字段的外键:

AttributeError: 'NoneType' object has no attribute '_state'

因为我有一个 fixtures/initial_data.yaml使用我的用户模型所需的值，工作流程是:

创建数据库

python manage.py syncdb

对您刚刚安装了 Django 的身份验证系统的问题回答“否”，这意味着您没有定义任何 super 用户。您想现在创建一个吗？ (是/否)

从 1 个固定装置安装了 14264 个对象

python manage.py createsuperuser

我尝试在导入设备后创建 super 用户，因此这不是由 City 模型的空数据库表引起的问题。

代码摘录，基于 documentation :

模型.py

class City(models.Model):
    city = models.CharField(max_length=70, help_text="City.")
    state = models.CharField(max_length=2, help_text="State.")
    class Meta:
        ordering = ['city']
    def __unicode__(self):
        return "%s (%s)" % (self.city, self.state)

class PersonaManager(BaseUserManager):
    [...]
    def create_superuser(self, email, name, birthplace, password):
        """
        Creates and saves a superuser with the given email, date of
        birth and password.
        """
        user = self.create_user(email,
            password=password,
            name=name,
            birthplace=birthplace,
        )
        user.is_admin = True
        user.save(using=self._db)
        return user

class Person(AbstractBaseUser):
    email = models.EmailField(
        verbose_name='email address',
        max_length=255,
        unique=True,
        db_index=True,
    )
    name = models.CharField(max_length=60)
    birthplace = models.ForeignKey('myapp.City', related_name="person_birthplace")
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)

    objects = PersonaManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['name', 'birthplace']

如何让外键在我的用户模型上的必填字段上工作？谢谢你。

编辑:
追溯自 manage.py createsuperuser --traceback :

Traceback (most recent call last):
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/core/management/base.py", line 222, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/core/management/base.py", line 252, in execute
    output = self.handle(*args, **options)
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/contrib/auth/management/commands/createsuperuser.py", line 112, in handle
    user_data[field_name] = field.clean(raw_value, None)
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 211, in clean
    self.validate(value, model_instance)
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1014, in validate
    using = router.db_for_read(model_instance.__class__, instance=model_instance)
  File "/home/asd/Envs/envdjango15/local/lib/python2.7/site-packages/django/db/utils.py", line 142, in _route_db
    return hints['instance']._state.db or DEFAULT_DB_ALIAS
AttributeError: 'NoneType' object has no attribute '_state'
AttributeError: 'NoneType' object has no attribute '_state'

Answer 1

不是 100% 确定这会解决它，但只是为了踢球，加入 PermissionsMixin 并从模型中删除 is_superuser。

也许在后台进行了某种权限检查——当然它不应该发生，但试一试。

我的怀疑来自于它试图找出它需要应用的模型权限的概念。