Django 管理错误“WSGIRequest”对象没有属性“用户”

我正在练习 Django，当我尝试去http://localhost/admin/ http://localhost/admin/我收到以下错误，我已检查 settings.py 并且 MIDDLEWARE_CLASSES 确实存在，是否还有其他原因导致我收到此消息。

    AttributeError at /admin/
'WSGIRequest' object has no attribute 'user'
Request Method: GET
Request URL:    http://localhost/admin/
Django Version: 2.0
Exception Type: AttributeError
Exception Value:    
'WSGIRequest' object has no attribute 'user'
Exception Location: /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/contrib/admin/sites.py in has_permission, line 186
Python Executable:  /usr/local/bin/python3
Python Version: 3.6.1
Python Path:    
['/Users/yasserhussain/learning_site',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload',
 '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages']
Server time:    Thu, 4 Jan 2018 00:17:34 +0000

设置中中间件的内容

MIDDLEWARE = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.security.SecurityMiddleware',
)

Django 2.0 放弃了对旧式中间件类的支持MIDDLEWARE_CLASSES 变更日志，最后一项 https://docs.djangoproject.com/en/2.0/releases/2.0/

如果您仅使用标准中间件，升级就很简单，如升级 Django 1.10 之前版本的中间件 https://docs.djangoproject.com/en/2.0/topics/http/middleware/#upgrading-pre-django-1-10-style-middleware。 通常只是重命名MIDDLEWARE_CLASSES to MIDDLEWARE并删除'django.contrib.auth.middleware.SessionAuthenticationMiddleware'足够。

您还必须确保django.contrib.auth已正确安装 https://docs.djangoproject.com/en/2.0/topics/auth/#installation。此外SessionMiddleware，你已经有了，你应该添加django.contrib.auth.middleware.AuthenticationMiddleware to the MIDDLEWARE环境。