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python - 对于我，枚举中的中间件（settings.MIDDLEWARE）：TypeError：'NoneType'对象不可迭代

问题描述

当我尝试运行时出现此错误

python manage.py runserver

或命令行中的任何其他 python manage.py * 命令。

但是当我尝试 python manage.py shell 时，它没有错误地连接并从数据库中获取数据。

错误：

 Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fa03b7386a8>
Traceback (most recent call last):
  File "/home/tornike/apps/env/lib/python3.6/site-packages/django/utils/autoreload.py", line 227, in wrapper
    fn(*args, **kwargs)
  File "/home/tornike/apps/env/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 125, in inner_run
    self.check(display_num_errors=True)
  File "/home/tornike/apps/env/lib/python3.6/site-packages/django/core/management/base.py", line 359, in check
    include_deployment_checks=include_deployment_checks,
  File "/home/tornike/apps/env/lib/python3.6/site-packages/django/core/management/base.py", line 346, in _run_checks
    return checks.run_checks(**kwargs)
  File "/home/tornike/apps/env/lib/python3.6/site-packages/django/core/checks/registry.py", line 81, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/home/tornike/apps/env/lib/python3.6/site-packages/debug_toolbar/apps.py", line 25, in check_middleware
    for i, middleware in enumerate(settings.MIDDLEWARE):
TypeError: 'NoneType' object is not iterable




MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    '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',
    'django.middleware.security.SecurityMiddleware'
)

标签： pythondjango

解决方案

错误清除表明 settings.MIDDLEWARE 为 None 但您已发布从 Django 2.0 中删除的 MIDDLEWARE_CLASSES。如果 django 的版本 >=2.0，请确保在 settings.py 中使用 MIDDLEWARE。

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