TypeError，__init__()缺少1所需的位置参数是什么?在python中'get_response‘指的是什么？

Question

我正在https://www.howtographql.com/graphql-python/4-authentication/上学习graphql教程。对于前三个部分，它运行得很好，但是在身份验证部分，我遇到了这个问题。

我正在学习python，不知道Django或graphql，所以它需要一次消化很多，但到目前为止还不错。也不确定这里要包含哪些相关的位元。

我遵守了所有的指示。当我去localhost:8000/graphql/的本地项目网站时，我得到了

TypeError at /graphql/

__init__() missing 1 required positional argument: 'get_response'

下面是我的settings.py的相关片段：

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graphql_jwt中导入了schema.py

下面是某种堆栈跟踪

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

好吧，我刚找到它。

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

注意S。需要的是'MIDDLEWARES'，而不是'MIDDLEWARE'。

在这个GitHub问题上找到了解决方案

此外，根据同一问题上的这句话，您应该将'graphql_jwt.middleware.JSONWebTokenMiddleware'添加到MIDDLEWARE列表(带有所有Django中间件的那个)。

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',
]

Answer 2

将django-graphql从教程的0.1.5升级到0.3.4 (或更高)

Answer 3

当我们从Django 2.2版本移到Django 4.0.5版本时，就面临着这个问题。将DRF版本从3.12.0更新到3.14.0以解决此问题。

pip安装djangorestframework==3.14.0