TypeError, __init__() missing 1 required positional argument: 'get_response' 在 python 中是什么意思？

Question

我正在关注https://www.howtographql.com/graphql-python/4-authentication/ 的 graphql python 教程。前 3 个部分运行良好，但在身份验证部分我遇到了这个问题。

我正在学习python，不知道Django或graphql，所以一次消化了很多，但到现在为止还可以。也不确定要在此处包含哪些相关位。

我遵循了所有的指示。当我在localhost:8000/graphql/ 访问我的本地项目站点时，我得到了

TypeError at /graphql/
__init__() missing 1 required positional argument: 'get_response'

这是我的settings.py的相关sn-p：

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    '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.contrib.auth.middleware.AuthenticationMiddleware',
]

GRAPHENE = {
    'SCHEMA': 'hackernews.schema.schema',
    'MIDDLEWARE': ['graphql_jwt.middleware.JSONWebTokenMiddleware', ],
}

AUTHENTICATION_BACKENDS = [
    'graphql_jwt.backends.JSONWebTokenBackend',
    'django.contrib.auth.backends.ModelBackend',
]

我还在我的主 schema.py 中导入了 graphql_jwt

这是某种堆栈跟踪

Environment:


Request Method: GET
Request URL: http://localhost:8000/graphql/

Django Version: 2.1.4
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',
 'graphene_django',
 'links']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 '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.contrib.auth.middleware.AuthenticationMiddleware']



Traceback:

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\django\core\handlers\exception.py" in inner
  34.             response = get_response(request)

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\django\core\handlers\base.py" in _get_response
  126.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\django\core\handlers\base.py" in _get_response
  124.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\django\views\decorators\csrf.py" in wrapped_view
  54.         return view_func(*args, **kwargs)

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\django\views\generic\base.py" in view
  62.             self = cls(**initkwargs)

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\graphene_django\views.py" in __init__
  88.             self.middleware = list(instantiate_middleware(middleware))

File "C:\Users\e79909\projects\python\graphql-python\venv\lib\site-packages\graphene_django\views.py" in instantiate_middleware
  48.             yield middleware()

Exception Type: TypeError at /graphql/
Exception Value: __init__() missing 1 required positional argument: 'get_response'

Answer 1

好的，我刚刚找到了。

GRAPHENE = {
    'SCHEMA': 'hackernews.schema.schema',
    'MIDDLEWARES': ['graphql_jwt.middleware.JSONWebTokenMiddleware'],
}

注意S。它必须是'MIDDLEWARES'，而不是'MIDDLEWARE'。

在GitHub issue找到解决方案

另外，根据this comment 在同一问题上，您应该将'graphql_jwt.middleware.JSONWebTokenMiddleware' 添加到MIDDLEWARE 列表（包含所有Django 中间件的列表）。

MIDDLEWARE = [
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'graphql_jwt.middleware.JSONWebTokenMiddleware', ### <---Add this line
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
]