Django admin 产生'WSGIRequest' object has no attribute 'user'的错误

Django服务起来之后，登录admin后台时，抛出下面错误：

AttributeError at /admin/
'WSGIRequest' object has no attribute 'user'
Request Method: GET
Request URL:    http://localhost:8000/admin/ Django Version: 1.8.2
Exception Type: AttributeError
Exception Value:
'WSGIRequest' object has no attribute 'user'
Exception Location: C:\Python27\lib\site-packages\django\contrib\admin\sites.py in has_permission, line 162
Python Executable:  C:\Python27\python.exe

google了下，说是MIDDLEWARE配置的有问题，顺序应该保持参见（http://stackoverflow.com/questions/26576192/wsgirequest-object-has-no-attribute-user）：

'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',

但是这样设置之后，依然没有解决。

我的MIDDLEWARE的配置是：

MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

实际上，这是Django版本的问题，1.10之前，中间件的key为MIDDLEWARE_CLASSES, 1.10之后，为MIDDLEWARE。所以在开发环境和其他环境的版本不一致时，要特别小心，会有坑。

改配置为：

MIDDLEWARE_CLASSES = [
'django.middleware.security.SecurityMiddleware',
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

问题解决。

参考 http://www.ziqiangxuetang.com/django/django-middleware.html