Django教程第3部分 - / poll /中的NoReverseMatch-Java 学习之路

我一直在关注Django tutorial part 3，当我尝试查看http://localhost:8000/polls/时收到以下错误：

**Reverse for 'detail' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'polls/(?P<question_id>[0-9]+)/$']**

我的文件如下：

mysite的/ urls.py：

from django.conf.urls import include, url
from django.contrib import admin
urlpatterns = [
    url(r'^polls/', include('polls.urls', namespace="polls")),
    url(r'^admin/', admin.site.urls),
]

民调/ urls.py：

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

民调/ detail.html：

<h1>{{ question.question_text }}</h1>
<ul>
{% for choice in question.choice_set.all %}
    <li>{{ choice.choice_text }}</li>
{% endfor %}
</ul>

民调/模板/调查/ index.html的：

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

What does this error mean?

How do I debug it?

Can you suggest a fix?

注：我见过并尝试过类似问题的答案：

NoReverseMatch at /polls/ (django tutorial) Django 1.8.2 -- Tutorial Chapter 3 -- Error: NoReverseMatch at /polls/ -- Python 3.4.3 NoReverseMatch - Django 1.7 Beginners tutorial Django: Reverse for 'detail' with arguments '('',)' and keyword arguments '{}' not found https://groups.google.com/forum/#!msg/django-users/etSR78dgKBo/euSYcSyMCgAJ NoReverseMatch at /polls/ (django tutorial) https://www.reddit.com/r/django/comments/3d43gb/noreversematch_at_polls1results_in_django/

编辑，我最初错过了以下问题 . 它的优秀答案部分回答了我的问题（如何调试），但没有涵盖我的具体问题 .

What is a NoReverseMatch error, and how do I fix it?

1 回答

这是问题所在：

polls / templates / polls / index.html应该是：

{% if latest_question_list %}
    <ul>
    {% for question in latest_question_list %}
        <li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
    {% endfor %}
    </ul>
{% else %}
    <p>No polls are available.</p>
{% endif %}

我无意中用以下行替换了整个文件，而不仅仅是更新了相关的行（隐含here）：

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

正如@Sayse在评论中所述，这意味着question.id为空，导致错误 .

回复于 2024-04-27T00:43:23+08:00

Django教程第3部分 - / poll /中的NoReverseMatch

1 回答

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