python之NoReverseMatch Django 教程 1.8

所以我从教程的通用 View 部分开始，直到那时一切都很顺利，工作完美，然后我得到这个错误: 反向“投票”，参数为“(”)，未找到关键字参数“{}”。尝试了 1 种模式:[u'polls/(?P[0-9]+)/vote/$']

这是我的 urls.py:

from django.conf.urls import url 
from . import views 
 
urlpatterns = [ 
url(r'^$', views.IndexView.as_view(), name='index'), 
url(r'^(?P<pk>[0-9]+)/$', views.DetailView.as_view(), name='detail'), 
url(r'^(?P<pk>[0-9]+)/results/$', views.ResultsView.as_view(), name='results'), 
url(r'^(?P<question_id>[0-9]+)/vote/$', views.vote, name ='vote'), 
] 

这是我的views.py:

from django.shortcuts import render, get_object_or_404 
from django.http import HttpResponse, HttpResponseRedirect 
from django.template import RequestContext, loader  
from django.http import Http404 
from .models import Choice, Quesion 
from django.core.urlresolvers import reverse 
from django.views import generic 
# Create your views here. 
 
class IndexView(generic.ListView): 
    template_name = 'polls/index.html' 
    context_object_name = 'latest_question_list' 
 
    def get_queryset(self): 
        return Quesion.objects.order_by('-pub_date')[:5] 
 
class DetailView(generic.DetailView): 
    model = Quesion 
    template_name = 'polls/detail.html' 
 
class ResultsView(generic.DetailView): 
    model = Quesion 
    template_name = 'polls/results.html' 
 
def vote(request, question_id): 
    p = get_object_or_404(Quesion, pk=question_id) 
    try: 
        selected_choice = p.choice_set.get(pk=request.POST['choice']) 
    except (KeyError, Choice.DoesNotExist): 
        return render(request, 'polls/detail.html', { 
            'question': p, 
            'error_message':"No choice selected", 
        }) 
    else: 
        selected_choice.votes += 1 
        selected_choice.save() 
        return HttpResponseRedirect(reverse('polls:results',args=(p.id,))) 

这是我的 detail.html

<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_txt }}   </label><br /> 
{% endfor %} 
<input type="submit" value="vote" /> 
</form> 

请您参考如下方法:

你有两个问题。第一个是 DetailView 在模板中没有提供 question 变量，而是提供了一个名为 object 的变量。所以模板中的所有question实例都需要改为object。

其次，URL 需要关键字参数 question_id，但您将非关键字参数传递给 {% url %} 标记。您需要将其更改为 question_id=object.id。您的 detail.html 应该如下所示:

<h1>{{ object.question_text }}</h1> 
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %} 
 
<form action="{% url 'polls:vote' question_id=object.id %}" method="post"> 
{% csrf_token %} 
{% for choice in object.choice_set.all %} 
    <input type="radio" name="choice" id="choice{{ forloop.counter }}"    value="{{ choice.id }}" /> 
    <label for="choice{{ forloop.counter }}">{{ choice.choice_txt }}   </label><br /> 
{% endfor %} 
<input type="submit" value="vote" /> 
</form>