Django is great, and the tutorial is great. I'm having a problem at the
very end of tutorial-4.
I try to use generic views, and I get an error when I Redirect from the
POST request in vote() to the Results page. Details below.
The tutorial code says to put this in my urls.py:
url(r'^(?P<pk>\d+)/results/$',
DetailView.as_view(
model=Poll,
template_name='polls/results.html')
,name="poll_results"
),
And this in my views.py:
from django.shortcuts import get_object_or_404, render_to_response
from django.http import HttpResponseRedirect, HttpResponse
from django.core.urlresolvers import reverse
from django.template import RequestContext
from polls.models import Choice, Poll
def vote(request, poll_id):
p = get_object_or_404(Poll, pk=poll_id)
try:
selected_choice = p.choice_set.get(pk=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
# Redisplay the poll voting form.
return render_to_response('polls/detail.html', {
'poll': p,
'error_message': "You didn't select a choice.",
}, context_instance=RequestContext(request))
else:
selected_choice.votes += 1
selected_choice.save()
# Always return an HttpResponseRedirect after successfully dealing
# with POST data. This prevents data from being posted twice if a
# user hits the Back button.
return HttpResponseRedirect(reverse('polls_results', args=(p.id,)))
### OKAY: return HttpResponseRedirect("/polls/%i/results" % p.id)
### OKAY: return render_to_response("polls/results.html",
{"poll": p})
### BAD: return
HttpResponseRedirect(reverse('polls.views.results', args=(p.id,)))
NoReverseMatch at /polls/4/vote/
Reverse for 'polls_results' with arguments '(4,)' and keyword arguments
'{}' not found.
*Request Method:*
POST
*Request URL:*
http://127.0.0.1:8000/polls/4/vote/
*Django Version:*
1.4
*Exception Type:*
NoReverseMatch
*Exception Value:*
Reverse for 'polls_results' with arguments '(4,)' and keyword arguments
'{}' not found.
*Exception Location:*
/Library/Python/2.7/site-packages/django/core/urlresolvers.py in
_reverse_with_prefix, line 407
*Python Executable:*
/usr/bin/python
*Python Version:*
2.7.1
*Python Path:*
['/Users/s3/Desktop/CODE/APPSS3/EdAssistant/experiments/djtest',
'/Library/Python/2.7/site-packages/mercurial-2.0.2-py2.7-macosx-10.7-intel.egg',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
'/Library/Python/2.7/site-packages']
*Server time:*
Mon, 16 Jul 2012 11:53:21 -0500
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