TypeError at/post/render_to_response() hat ein unerwartetes Schlüsselwort argument 'context_instance'

Question

Ich versuche eine Vorschau des Formulars vor dem Speichern mit 'formtools'. Wenn ich Post besuchen gibt es folgende Fehler: Methode anfordern: Anforderungs-URL GET: http://127.0.0.1:8000/post/

Django Version: 1.10.1 
Python Version: 3.5.2 
Installed Applications: 
['django.contrib.admin', 
'django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'pagedown', 
'bootstrapform', 
'contact', 
'crispy_forms', 
'formtools', 
'member'] 
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'] 



Traceback: 

File "/home/ohid/test_venv/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner 
    39.    response = get_response(request) 

File "/home/ohid/test_venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _legacy_get_response 
    249.    response = self._get_response(request) 

File "/home/ohid/test_venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
    187.     response = self.process_exception_by_middleware(e, request) 

File "/home/ohid/test_venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
    185.     response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "/home/ohid/test_venv/lib/python3.5/site-packages/formtools/preview.py" in __call__ 
    34.   return method(request) 

File "/home/ohid/test_venv/lib/python3.5/site-packages/formtools/preview.py" in preview_get 
    58.    context_instance=RequestContext(request)) 

Exception Type: TypeError at /post/ 
Exception Value: render_to_response() got an unexpected keyword argument 'context_instance' 

Hier ist meine preview.py:

from .preview import PersonFormPreview 
from .forms import MemberForm 
from django import forms 

url(r'^post/$', PersonFormPreview(MemberForm)), 

:

from formtools.preview import FormPreview 
from django.http import HttpResponseRedirect 
from .models import Person 

    class PersonFormPreview(FormPreview): 
     form_template = 'member/person_form.html' 
     preview_template = 'member/person_review.html' 
     model = Person 

     def done(self, request, cleaned_data): 
      self.form.save() 
      # Do something with the cleaned_data, then redirect 
      # to a "success" page. 
      return HttpResponseRedirect('/form/success') 

Hier meine Urls ist

Wie behebe ich diesen Fehler?

Answer 1

Ich löste es durch einige Änderungen in lib/python3.5/site-packages/formtools/preview.py Datei. Hier ändere ich zuerst render_to_response zum Rendern und entferne dann context_instance = RequestContext (request) von argument. Es sei post_post Verfahren nun wie folgt aussehen:

def post_post(self, request): 
     """ 
     Validates the POST data. If valid, calls done(). Else, redisplays form. 
     """ 
     form = self.form(request.POST, auto_id=self.get_auto_id()) 
     if form.is_valid(): 
      if not self._check_security_hash(
        request.POST.get(self.unused_name('hash'), ''), 
        request, form): 
       return self.failed_hash(request) # Security hash failed. 
      return self.done(request, form.cleaned_data) 
     else: 
      return render(request, self.form_template, 
       self.get_context(request, form)) 

Hope this andere helfen.

Answer 2

formtools nicht unterstützt die Django 1.10 Version bitte downgrade Ihre Django-Version für die Problemumgehung.

https://github.com/django/django-formtools/issues/75

Answer 3

Es sieht aus wie es bereits in ihrem Repository festgelegt wurde:

in dieser

https://github.com/django/django-formtools/blob/master/formtools/preview.py#L88

begehen:

https://github.com/django/django-formtools/commit/46b6839fb0063fa10ffb896ce80f7155ca7a9f6e

Deinstallieren django-Formstähle (pip uninstall django-formtools) und die Bibliothek installieren Sie diese mit Dieser Pip-Befehl stattdessen:

pip install -e git+git://github.com/django/django-formtools#egg=django-formtools