【发布时间】：2015-02-08 15:20:52
【问题描述】：
我整个早上都在努力完成 Django 1.7 教程04。我已经阅读了 stackoverflow 上关于 NoReverseMatch 错误的所有类似帖子，我的错误略有不同：
Reverse for 'vote' with arguments '('',)' and keyword arguments '{}' not found.
1 pattern(s) tried: [u'polls/(?P<question_id>\\d+)/vote/$']。
它似乎对我的 details.html 表单操作属性感到窒息：
<body bgcolor="white">
<h1>{{ question.question_text }}</h1>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
<form action="{% url 'polls:vote' question_id %}" method="post">
{% csrf_token %}
{% for choice in question.choice_set.all %}
<input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" />
<label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br />
{% endfor %}
<input type="submit" value="Vote" />
</form>
</body>我已经在我的主 url 中定义了 polls 命名空间，并让它在我的投票索引页面上运行 - ul li 中的 a 标签使用 {% url 'polls:detail' question.id %} 并且它工作得很好。
我的 polls/urls.py 看起来像：
from django.conf.urls import patterns, url
from polls import views
urlpatterns = patterns('',
url(r'^$',views.index, name='index'),
url(r'^(?P<question_id>\d+)/$', views.detail, name='detail'),
url(r'^(?P<question_id>\d+)/results/$', views.results, name='results'),
url(r'^(?P<question_id>\d+)/vote/$', views.vote, name='vote'),
)
最后是我的投票/views.py：
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse,Http404
from django.http import HttpResponseRedirect, HttpResponse
from polls.models import Question,Choice
# Create your views here.
def index(request):
latest_question_list = Question.objects.order_by('-pub_date')[:5]
context = {'latest_question_list': latest_question_list}
return render(request, 'polls/index.html', context)
def detail(request, question_id):
question = get_object_or_404(Question, pk=question_id)
return render(request, 'polls/detail.html', {'question':question})
def results(request, question_id):
response = HttpResponse("You're looking at the results of question %s.")
return HttpResponse(response % question_id)
def vote(request, question_id):
p = get_object_or_404(Question, pk=question_id)
try:
selected_choice = p.choice_set.get(pk=request.POST['choice'])
except (KeyError, Choice.DoesNotExist):
# redisplay the question voting form
return render(request, 'polls/detail.html', {
'question': p,
'error_message': "You didn't select a choice.",
})
else:
selected_choice.votes += 1
select_choice.save()
# always return response redirect after dealing with POST
# to prevent reposts if user hits back button
return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))
错误：
NoReverseMatch at /polls/1/
Reverse for 'vote' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'polls/(?P<question_id>\\d+)/vote/$']
Request Method: GET
Request URL: http://localhost:8000/polls/1/
Django Version: 1.7.4
Exception Type: NoReverseMatch
Exception Value:
Reverse for 'vote' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'polls/(?P<question_id>\\d+)/vote/$']
Exception Location: /usr/local/lib/python2.7/site-packages/django/core/urlresolvers.py in _reverse_with_prefix, line 468
Python Executable: /usr/bin/python
Python Version: 2.7.9
任何帮助将不胜感激。感谢您的阅读。
【问题讨论】：