使用Django Cache Middleware会导致contrib.auth单元测试失败 [英] Using Django Cache Middleware causes contrib.auth unit tests to fail

问题描述

问题::将UpdateCacheMiddleware和FetchFromCacheMiddleware添加到我的Django项目中时，出现单元测试失败.这与我使用的CACHE_BACKEND无关(现在我正在使用locmem://，但是当我使用file:///path_to_cache时，错误是相同的)

Problem: When I add UpdateCacheMiddleware and FetchFromCacheMiddleware to my Django project, I get unittest failures. This is regardless of the CACHE_BACKEND I use (right now I am using locmem://, but the errors are the same when I use file:///path_to_cache)

我的中间件:

MIDDLEWARE_CLASSES = (
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware',
)

我所有的测试失败看起来都像下面这样:'NoneType'对象不可取消

All my test failures look like the one below: 'NoneType' object is unsubscriptable

======================================================================
Error: test_last_login (django.contrib.auth.tests.remote_user.RemoteUserTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Python26\lib\site-packages\django\contrib\auth\tests\remote_user.py",
 line 87, in test_last_login
    self.assertNotEqual(default_login, response.context['user'].last_login)
TypeError: 'NoneType' object is unsubscriptable

在网络上搜索此问题时，我一定会丢失某些东西(或做错了什么)，但似乎没人遇到过.

I must be missing something (or doing something wrong) as I have searched around the web for this issue, but no one seems to have encountered it.

复制步骤:

1. 启动一个新的django项目(django-admin.py startproject myproject)并配置settings.py
2. 将CACHE_BACKEND添加到settings.py，并从Django添加两个缓存中间件
3. 运行python manage.py测试

注意事项:使用dummy://缓存时只有一次测试失败，并记录在以下位置: http://code.djangoproject.com/ticket/11640

Notes: There is only one test failure when using dummy:// cache and it is documented at: http://code.djangoproject.com/ticket/11640

推荐答案

对于失败的测试，解决方案是将CACHE_MIDDLEWARE_SECONDS设置为0(例如，在您的开发环境中将其设置为0).这将使django.contrib测试全部通过.

The solution to the failing tests is to set CACHE_MIDDLEWARE_SECONDS to 0 (e.g. set this to be 0 in your dev environment). This will allow the django.contrib tests to all pass.

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