__init __（）缺少1个必需的位置参数：“ request”

Question

我正在尝试将Django项目从1.8升级到1.10。以下：Django error: render_to_response() got an unexpected keyword argument 'context_instance'

我从

更改了视图功能

from django.shortcuts import render
from django.http import HttpResponse
from django.template import RequestContext, loader
from django.shortcuts import render
from django.core.mail import EmailMessage
from django.http import HttpResponseRedirect
from sellmyland.settings import DEFAULT_FROM_EMAIL
from ipware.ip import get_ip
import json
from myapp.forms import myform


def index(request):


    form = myform()

    # return render('longform.html', {"form": form}, context_instance=RequestContext(request))

    return render(request,'longform.html',RequestContext())

您可以在代码中看到注释掉的版本。我收到上面的错误。这是回溯：

Traceback:

File "....\lib\site-packages\django\core\handlers\exception.py" in inner
  39.             response = get_response(request)

File "....\lib\site-packages\django\core\handlers\base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "....\lib\site-packages\django\core\handlers\base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "....\lib\site-packages\django\core\handlers\base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "....myapp\views.py" in index
  31.     return render(request,'longform.html',RequestContext())

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

我该如何工作？

编辑：

我尝试同时更改为两者：

return render(request,'longform.html', RequestContext(request, {'form': form}))

和

return render(request,'longform.html', {'form': form})

但是在两种情况下我都会得到：

Template loader postmortem
Django tried loading these templates, in this order:

Using engine :
    This engine did not provide a list of tried templates.



Traceback:

File "....\lib\site-packages\django\core\handlers\exception.py" in inner
  39.             response = get_response(request)

File "....\lib\site-packages\django\core\handlers\base.py" in _legacy_get_response
  249.             response = self._get_response(request)

File "....\lib\site-packages\django\core\handlers\base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "....\lib\site-packages\django\core\handlers\base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "E:\ENVS\r3\sellmyland3\app1\views.py" in index
  31.     return render(request,'longform.html', RequestContext(request, {'form': form}))

File "....\lib\site-packages\django\shortcuts.py" in render
  30.     content = loader.render_to_string(template_name, context, request, using=using)

File "....\lib\site-packages\django\template\loader.py" in render_to_string
  67.         template = get_template(template_name, using=using)

File "....\lib\site-packages\django\template\loader.py" in get_template
  25.     raise TemplateDoesNotExist(template_name, chain=chain)

Exception Type: TemplateDoesNotExist at /
Exception Value: longform.html

有什么想法吗？

edit2：

BASE_DIR = os.path.dirname(os.path.dirname(__file__))
PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))  


TEMPLATE_DIRS = (
    # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
    # Always use forward slashes, even on Windows.
    # Don't forget to use absolute paths, not relative paths.
    os.path.join(BASE_DIR, 'templates'),
)

edit3：

TypeError：dict最多应有1个参数，得到3个

edit4：

ERRORS:
?: (admin.E402) 'django.contrib.auth.context_processors.auth' must be in TEMPLATES in order to use the admin application.

WARNINGS:
?: (1_8.W001) The standalone TEMPLATE_* settings were deprecated in Django 1.8 and the TEMPLATES dictionary takes precedence. You must put the values of the following settings into your default TEMPLATES dict: TEMPLATE_DEBUG.

System check identified 2 issues (0 silenced).

最后编辑：

我使用以下方法使它起作用：

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'debug': DEBUG,
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

Answer 1

问题是RequestContext类。它具有必填参数request。但是您无需将RequestContext作为render参数来传递。只需使用dict即可：

return render(request, 'longform.html', {"form": form})

Answer 2

您没有将request传递给RequestContext()，这就是为什么会出错。签出文档here。

def index(request):

    form = myform()
    return render(request, 'longform.html', RequestContext(request, {'form': form}))

最好使用dict而不是RequestContext()。为此，您可以这样做。

def index(request):

    form = myform()
    return render(request, 'longform.html', {'form': form})

编辑：

将这些添加到您的settings.py。

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            # some options
        },
    },
]