Question

Views.py
from django.shortcuts import render, get_object_or_404
from django.http import HttpResponse, HttpResponseRedirect
from django.urls import reverse
from . models import Question
from django.template import loader, RequestContext
# Create your views here.

def index(request):
    latest_questions = Question.objects.all()[:5]
    context = {'latest_questions': latest_questions}
    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):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, 'polls/results.html', {'question': question})


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():
        return render(request, 'polls/detail.html', {'question': question, 'error_message' : "Please select a choice"})
    else:
        selected_choice.votes += 1
        selected_choice.save()

        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

由于它不是有效的视图函数，因此我得到的结果没有反向匹配。我是django的新手。我该如何解决？这是否意味着我的view.py代码存在问题，或者在我学习本教程时可能是问题所在。

polls/urls.py
    from django.conf.urls import url
    from . import views

    urlpatterns=[
        url(r'^$', views.index,name='index'),

        url(r'^(?P<question_id>[0-2]+)/$', views.detail, name='detail'),

        url(r'^(?P<question_id>[0-2]+)/results', views.results, name='result'),

        url(r'^(?P<question_id>[0-2]+)/votes', views.vote, name='vote'),
    ]

这是polls / templates / polls / results.html文件

Results.html
{% extends 'polls/base.html' %}

{% block main_content %}

<h1>{{question.question_text}}</h1>

<ul>
    {% for choice in question.choice_set.all %}
        <li> {{choice.choice_text}} -- {{choice.votes}} vote{{ choice.votes|pluralize}}</li>
    {% endfor %}
</ul>

<a href="{% url 'polls:detail' question.id %}">Vote Again?</a>

{% endblock %}

我在其中使用命名空间的mysite / urls.py。可能是什么问题。

 Mysite/urls.py
    from django.contrib import admin
    from django.conf.urls import url, include

    urlpatterns = [

        url(r'^admin/', admin.site.urls),
        url(r'^polls/', include(('polls.urls', 'polls'), namespace='polls')),

    ]

Answer 1

您已在视图reverse中使用vote。将第一个参数从“ polls：results ”更改为“ polls：result ”或“ result ”。

Reverse用于指向urls.py中定义的URL模式。查看urlpatterns中的第三个条目，为它提供了名称“ result ”。那应该可以解决您的问题。

django.urls.exceptions.NoReverseMatch：找不到“结果”的反向。 “结果”不是有效的视图函数或模式名称

1 个答案: