python - Django——模型不存在，但 Django 仍然加载它们

Question

当我尝试删除一个 User 对象时，我得到一个 ProgrammingError，这就是 User.delete 发生的地方，它甚至发生在管理员中。

错误

Django 显然“认为”auth_user 和 apiHandlers_cardholders 之间的关系不存在，数据库没有这个列，并且有在名为 apiHandlers 的应用程序中既没有 models.[y 也没有 admin.py ，但 Django 期望它，甚至有一部分专门用于它的管理站点。当我从 SQLite 迁移到 PostGreSQL 时，这种情况才开始发生。

目前所有本地依赖项(模型、管理、表单和字段)都在一个名为 helpers 的应用程序中，我不确定这是否有效，但它会将所有内容都放在一个地方并避免复杂化。

更新 0.1

没有。其中一个可能会有很多更新

我以前在迁移时遇到过与 Django Rest Framework 相关的问题，但我最终设法通过快速 pip install 修复了 restframework 的新更新，它不再给我任何进行迁移和迁移时出错。

下面是我从 Django 管理员那里得到的当前回溯，它在其他删除方法中基本相同。

`

Environment:


Request Method: GET
Request URL: http://localhost:8000/admin/auth/user/3/delete/

Django Version: 1.9.2
Python Version: 2.7.10
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rest_framework',
 'corsheaders',
 'oauth2_provider',
 'apiHandlers',
 'frontEnd',
 'helpers',
 'nonUser']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'corsheaders.middleware.CorsMiddleware',
 'oauth2_provider.middleware.OAuth2TokenMiddleware']



Traceback:

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  149.                     response = self.process_exception_by_middleware(e, request)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper
  541.                 return self.admin_site.admin_view(view)(*args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  149.                     response = view_func(request, *args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
  244.             return view(request, *args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
  67.             return bound_func(*args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  149.                     response = view_func(request, *args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
  63.                 return func.__get__(self, type(self))(*args2, **kwargs2)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/utils/decorators.py" in inner
  184.                     return func(*args, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/contrib/admin/options.py" in delete_view
  1629.             [obj], opts, request.user, self.admin_site, using)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/contrib/admin/utils.py" in get_deleted_objects
  128.     collector.collect(objs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/contrib/admin/utils.py" in collect
  193.             return super(NestedObjects, self).collect(objs, source_attr=source_attr, **kwargs)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/deletion.py" in collect
  230.                     elif sub_objs:

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/query.py" in __nonzero__
  266.         return type(self).__bool__(self)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/query.py" in __bool__
  262.         self._fetch_all()

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
  1074.             self._result_cache = list(self.iterator())

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/query.py" in __iter__
  52.         results = compiler.execute_sql()

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
  848.             cursor.execute(sql, params)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  79.             return super(CursorDebugWrapper, self).execute(sql, params)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/utils.py" in __exit__
  95.                 six.reraise(dj_exc_type, dj_exc_value, traceback)

File "/Users/Mason/Documents/dev/FlowFrameWork/flow-framework/env/lib/python2.7/site-packages/django/db/backends/utils.py" in execute
  64.                 return self.cursor.execute(sql, params)

Exception Type: ProgrammingError at /admin/auth/user/3/delete/
Exception Value: relation "apiHandlers_cardholder" does not exist
LINE 1: ...user"."is_active", "auth_user"."date_joined" FROM "apiHandle...
                                                         ^

`

更新 0.2

• 我正在使用 ./manage.py runserver (Mac) 来运行它，到目前为止我还没有在我的服务器上用 Nginx 和 WSGI 测试它。

• 我没有收到警告说它可能会影响另一个模型，例如，在管理员中，我只是立即收到此错误。

Answer 1

这很可能是因为您在某处有一个杂散的 models.pyc 文件。清除所有 *.pyc 文件。如果你在 linux 上，你可以尝试这样的事情:

find . -name '*pyc' -exec 'rm' '{}' ';'

按照 ./manage.py makemigrations apihandlers 然后 ./manage.py migrate