Question

我有三种不同的应用程序：

从用户
公司，从用户
候选人，来自人

在人模块中：

class Person(User):
    introductory_text = models.TextField(verbose_name=_(u"Introductory text"), blank=True, null=True)
    image = FilerImageField(null=True, blank=True, verbose_name="Image", related_name='image_person')

    class Meta:
        verbose_name = _(u"Person")
        verbose_name_plural = _(u"People")

    def __str__(self):
        return str(self.email)

在组织中，它与此人非常相似：

class Organization(User):
    organization_name = models.CharField(verbose_name=_(u"Organiztion name"), max_length=40)
    CIF = models.CharField(verbose_name=_("CIF"), max_length=9)

    class Meta:
        verbose_name=_(u"Organization")
        verbose_name_plural=_(u"Organizations")

    def __str__(self):
        return str(self.organization_name)

最后，在候选人应用中：

class Profile(models.Model):
    person = models.OneToOneField('person.Person', related_name='profile_person')
    mute_offer = models.BooleanField(verbose_name=_(u"Mute offers?"))

    class Meta:
        verbose_name = _(u"Profile")
        verbose_name_plural = _(u"Profiles")

    def __str__(self):
        return "Profile"

当我做makemigrations时，一切正常，但在进行迁移时：

    Operations to perform:
  Synchronize unmigrated apps: staticfiles, modeltranslation, redactor, messages, linkedin, bootstrap_admin, allauth, facebook, google
  Apply all migrations: person, auth, sites, easy_thumbnails, admin, contenttypes, django_messages, filer, notifications, sessions, push_notifications, organization, account, candidate, socialaccount
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states...Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/core/management/base.py", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/core/management/base.py", line 441, in execute
    output = self.handle(*args, **options)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 221, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/db/migrations/executor.py", line 104, in migrate
    state = migration.mutate_state(state, preserve=do_run)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/db/migrations/migration.py", line 83, in mutate_state
    operation.state_forwards(self.app_label, new_state)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/db/migrations/operations/fields.py", line 51, in state_forwards
    state.reload_model(app_label, self.model_name_lower)
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/db/migrations/state.py", line 122, in reload_model
    related_models.update(get_related_models_recursive(rel_model))
  File "/home/karlie/.virtualenvs/tuwing/lib/python3.4/site-packages/django/db/migrations/state.py", line 57, in get_related_models_recursive
    rel_app_label, rel_model_name = rel_mod._meta.app_label, rel_mod._meta.model_name
AttributeError: 'NoneType' object has no attribute '_meta'

如果我删除字段人OneToOneField一切正常，所以我想这可能是因为我与从User扩展的Person的关系。我怎样才能解决这个问题？我无法改变应用程序的结构，如果因为我有两个模型从Django的User模型扩展，我认为用User进行onetoonefield并不是一个好主意，因为它只会影响到此人。

任何帮助将不胜感激，

谢谢！

Answer 1

这可能只是一个依赖问题。

./manage.py makemigrations profile
./manage.py makemigrations person
./manage.py makemigrations organization
./manage.py migrate

您的要求如下： candidate.Profile需要person.Person和person.Person需要auth.User

您不需要再次使用auth.User运行makemigrations。请执行以下操作：

#include <string>
#include <sstream>

template<int index> double getValue() 
{
    std::stringstream ss("Not implemented for index ");
    ss << index;
    throw std::exception(ss.str()); 
}

template<> double getValue<0>() { return 3.6; }
template<> double getValue<1>() { return 7.77; }

template<int index> double multiply(double x)
{
    return getValue<index>() * x;
}

Answer 2

我已经解决了导入应用程序模块的问题：

from person import models as person_class

然后，在OneToOneField的领域：

person = models.OneToOneField(person_class.Person, verbose_name=_(u"Person"), related_name="person")

修改：
错了，错误又出来了。厌倦了搜索，我已将项目更改为Django 1.7（以前是django 1.8）并且此错误未再出现。

ForeignKey生成＆＃39; NoneType＆＃39;对象没有属性＆＃39; _meta＆＃39;进行迁移时

2 个答案: