python - Django 自定义管理 admin.site.register + admin.site.unregister 在第一个 HTTP GET 上与 AlreadyRegistered + NotRegistered 发生冲突(Apache + mod WSGI)

Question

在第一次 HTTP GET 期间(在守护进程模式下的 WSGI 重新加载之后)，admin.site.unregister 抛出 NotRegistered 异常，但 admin.site.register 抛出 AlreadyRegistered 异常(catch-22？)但是，在随后的 HTTP GET，一切都加载得很好，没有错误。

设置:

• Django 1.3
• Apache 2.2
• CentOS

设置.py:

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    #'django.contrib.sites', #(this didn't seem to make a difference)
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Uncomment the next line to enable the admin:
    'django.contrib.admin',
    # Uncomment the next line to enable admin documentation:
    'django.contrib.admindocs',
    'base',
    'sample',
    'reports',
    'south',
)

模型.py:

from django.db import models
from django.contrib import admin
from django.contrib.auth.models import User
from django.contrib.auth.admin import UserAdmin as AuthUserAdmin

class Company(models.Model):
  name = models.CharField(max_length=256)

class CompanyUser(models.Model):
  company = models.ForeignKey(Company)
  user = models.OneToOneField(User)

class CompanyUserInline(admin.StackedInline):
  model = CompanyUser
  max_num = 1
  can_delete = False

class CompanyUserAdmin(AuthUserAdmin):
  inlines = [ CompanyUserInline ]

# STUCK HERE !!
try:
  admin.site.unregister(User)
  # throws NotRegistered at / The model User is not registered
except:
  admin.site.register(User, CompanyUserAdmin)
  # throws AlreadyRegistered at / The model User is already registered

Answer 1

我在 freenode 的 #django 上找到了 mlavin 的答案

you are defining this in your models.py rather than admin.py (which is fine) but if you have any place in your code which does import * on that models file it will execute the register calls again

将 admin.py 中的内容移至 admin.py(从 models.py)解决了这个问题!不过，在我看来，我继承了代码库 - 我不确定为什么我要把这个代码片段放在 models.py 而不是 admin.py 中。

有趣的是:虽然这个问题从来没有通过“manage.py runserver”在本地出现过，但只有当我通过 Apache + WSGI 部署时，另一个人提到他们能够在本地重现它。奇怪。

但案件已结。