Django login 'NoneType' object 没有属性 'append'

Question

Django Allauth 存在问题。 当我注销一个用户并与另一个用户重新登录时，我在本地和生产中都遇到了这个问题。

我正在使用最新版本的 Allauth，Django 3.0.5 和 Python 3.7.4。

这似乎是一个 Allauth 问题，但我还没有在其他任何地方看到它在网上报告过。 所以只是想知道接下来我能做些什么来排除故障。 登录工作正常，更少我刚刚退出另一个用户。

'NoneType' object has no attribute 'append'
Request Method: POST
Request URL:    http://127.0.0.1:8000/account/login/
Django Version: 3.0.5
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'append'
Exception Location: /Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py in authentication_failed, line 507
Python Executable:  /Users/[USERDIR]/Sites/frontline/venv/bin/python
Python Version: 3.7.4
Python Path:    
['/Users/[USERDIR]/Sites/frontline',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python37.zip',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/lib-dynload',
 '/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf']
Server time:    Thu, 16 Apr 2020 17:53:52 -0700

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/account/login/

Django Version: 3.0.5
Python Version: 3.7.4
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.humanize',
 'django.contrib.sites',
 'django.contrib.sitemaps',
 'django.contrib.postgres',
 'common',
 'bootstrap4',
 's3direct',
 'bootstrap_datepicker_plus',
 'import_export',
 'tinymce',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'debug_toolbar',
 'dashboard',
 'marketing']
Installed Middleware:
('debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')



Traceback (most recent call last):
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
    return view(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 138, in dispatch
    return super(LoginView, self).dispatch(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 81, in dispatch
    **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 103, in post
    if form.is_valid():
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 180, in is_valid
    return self.is_bound and not self.errors
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 175, in errors
    self.full_clean()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 377, in full_clean
    self._clean_form()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 404, in _clean_form
    cleaned_data = self.clean()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/forms.py", line 179, in clean
    **credentials)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py", line 497, in authenticate
    self.authentication_failed(request, **credentials)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py", line 507, in authentication_failed
    data.append(time.mktime(dt.timetuple()))

Exception Type: AttributeError at /account/login/
Exception Value: 'NoneType' object has no attribute 'append'

Answer 1

将您的allauth包放在已安装应用程序的顶部，然后重试。 这可能是一个冲突问题，因为默认的django.contrib.auth package 位于层次结构的顶部，当 django 查看已安装的应用程序时，它会在第一个匹配的应用程序上停止。

Answer 2

查看allauth代码，

def authentication_failed(self, request, **credentials):
  if app_settings.LOGIN_ATTEMPTS_LIMIT:
    cache_key = self._get_login_attempts_cache_key(
      request, **credentials
    )
    data = cache.get(cache_key, [])
    dt = timezone.now()
    data.append(time.mktime(dt.timetuple()))
    cache.set(cache_key, data, app_settings.LOGIN_ATTEMPTS_TIMEOUT)

似乎由于某种原因，缓存正在为登录尝试键存储None值（请注意，它忽略了默认值[] ）。 CACHE设置变量设置是否正确？

环顾四周， memcached 似乎存在一些问题，如果那是您正在使用的（编辑：我现在认为这是不可能的，因为 Django 代码只是将值设置为默认值，如果结果为None ，无论是否实际上是这样，或者由于python-memcached限制，密钥不存在）。 这是非常奇怪的行为，您可以按照评论中的建议停用此功能，但这似乎是一个等待咬人的潜在问题。