Question

我正在关注Django的教程，但是当我到达第5部分时遇到错误。

NoReverseMatch at /polls/ 
Reverse for 'detail' with arguments '('',)' not found. 1 pattern(s) tried: ['polls\\/(?P<pk>[0-9]+)\\/$']

Request Method: GET 
Request URL:    http://127.0.0.1:8000/polls/ 
Django Version: 2.0.2 
Exception Type: NoReverseMatch 
Exception Value:     Reverse for 'detail' with arguments '('',)' not found. 1 pattern(s) tried: ['polls\\/(?P<pk>[0-9]+)\\/$']

Error during template rendering
In template /media/shawn/New Volume/tests/django/mysite/polls/templates/polls/index.html, error at line 5
<li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>

轮询/ urls.py：

from django.urls import path

from . import views

app_name = 'polls'
urlpatterns = [
    path('', views.IndexView.as_view(), name='index'),
    path('<int:pk>/', views.DetailView.as_view(), name='detail'),
    path('<int:pk>/results/', views.ResultsView.as_view(), name='results'),
    path('<int:question_id>/vote/', views.vote, name='vote'),
]

轮询/模板/轮询/ index.html中：

{% load static %}

<link rel="stylesheet" type="text/css" href="{% static 'polls/style.css' %}" />

<li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>

轮询/ views.py：

from django.utils import timezone
from django.shortcuts import get_object_or_404, render
from django.http import HttpResponseRedirect
from django.urls import reverse
from django.views import generic

from .models import Choice, Question


class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'

    def get_queryset(self):
        """
        Return the last five published questions (not including those set to be
        published in the future).
        """
        return Question.objects.filter(
            pub_date__lte=timezone.now()
        ).order_by('-pub_date')[:5]


class DetailView(generic.DetailView):
    model = Question
    template_name = 'polls/detail.html'

    def get_queryset(self):
        """
        Excludes any questions that aren't published yet.
        """
        return Question.objects.filter(pub_date__lte=timezone.now())


class ResultsView(generic.DetailView):
    model = Question
    template_name = 'polls/results.html'


def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "You didn't select a choice.",
        })
    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=(question.id,)))

基于错误，它似乎是由于polls / index.html。但是，我真的不明白这意味着什么。

请告诉我如何解决此错误。

Answer 1

您的链接应该包含在for循环中：

{% for question in latest_question_list %}
    <li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
{% endfor %}

Django教程NoReverseMatch错误

1 个答案: