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在我的 django 项目中，我从一开始就将 django auth 用户换成了自定义用户模型。我为用户使用代理模型作为 AUTH_USER_MODEL。项目布局有点像这样，

manage.py
project/
    __init__.py
    settings.py
    urls.py
    wsgi.py
userlocal/
    models.py
userproxy/
    models.py

相关部分如下，

项目/settings.py

AUTH_USER_MODEL = 'userproxy.ProxyUser'

INSTALLED_APPS = (
    'south',

    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.admin',
    'django.contrib.admindocs',

    'project',
    'userlocal',
    'userproxy',
)

用户本地/models.py

from django.db import models
from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin


class LocalUser(AbstractBaseUser, PermissionsMixin):
    """
    Custom User Model
    """

    USERNAME_FIELD = 'username'
    REQUIRED_FIELDS = ['email']

    username = models.CharField(max_length=255, unique=True)
    email = models.CharField(max_length=255, unique=True)

    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_deleted = models.BooleanField(default=False)
    is_registered = models.BooleanField(default=True)

用户代理/models.py

from userlocal.models import LocalUser


class ProxyUser(LocalUser):

    class Meta():
        proxy = True

到目前为止，syncdb 工作正常。现在我想对我的 userlocal 模型进行更改，因此我创建了一个初始架构迁移。

python manage.py schememigration --initial userlocal

 + Added model userlocal.LocalUser
 + Added M2M table for groups on userlocal.LocalUser
 + Added M2M table for user_permissions on userlocal.LocalUser
Created 0001_initial.py ...

我将以下内容添加到我的 userlocal 模型中，

first_name = models.CharField(max_length=255, null=True)
last_name = models.CharField(max_length=255, null=True)

并为它创建一个新的迁移，

python manage.py schemamigration --auto userlocal

 + Added field first_name on userlocal.LocalUser
 + Added field last_name on userlocal.LocalUser
Created 0002_auto__...py. ...

现在，当我运行同步数据库时，它存在于 OperationalError 中

Syncing...
Creating tables ...
Creating table south_migrationhistory
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table django_content_type
Creating table django_session
Creating table django_site
Creating table django_admin_log
Creating table userlocal_localuser
Traceback (most recent call last)
...
...
...
django.db.utils.OperationalError:
(1005, "Can't create table 'project_dev.#sql-11e1_10e' (errno: 150)")

当我调试 syncdb 进程时，执行的最后一个查询是，

Creating table userlocal_localuser
ALTER TABLE `django_admin_log`
ADD CONSTRAINT `user_id_refs_id_7b1a6083`
FOREIGN KEY (`user_id`)
REFERENCES `userlocal_localuser` (`id`);

所以它试图创建一个从 django_admin_log 到 userlocal_localuser 的约束。但是后者不是在syncdb期间创建的，因为它有迁移，对吧......？那么为什么要创建这个约束......？

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