Django Error u"'polls"不是注册的命名空间

Question

昨天我正在使用本教程开发我的第一个应用程序.这是一个民意调查和选择应用程序.第一页显示问题,当您点击问题时,它会显示您可以对其进行投票的选项.

昨天我有很棒的人帮我,并告诉我使用命名空间.我已经阅读了命名空间教程,并尝试将我的知识应用到场景中,但到目前为止它还没有工作.

当我点击第一页的问题时,这是我的错误.

 NoReverseMatch at /polls/5/

 u"'polls" is not a registered namespace

 Request Method:    GET
 Request URL:   http://127.0.0.1:8000/polls/5/
 Django Version:    1.4.3
 Exception Type:    NoReverseMatch
 Exception Value:   

 u"'polls" is not a registered namespace

 Exception Location:    C:\hp\bin\Python\Lib\site-packages\django\template\defaulttags.py in render, line 424
 Python Executable:     C:\hp\bin\Python\python.exe
 Python Version:    2.5.2
 Python Path:   

 ['C:\\djcode\\mysite',
  'C:\\hp\\bin\\Python\\python25.zip',
  'C:\\hp\\bin\\Python\\DLLs',
  'C:\\hp\\bin\\Python\\lib',
  'C:\\hp\\bin\\Python\\lib\\plat-win',
  'C:\\hp\\bin\\Python\\lib\\lib-tk',
  'C:\\hp\\bin\\Python',
  'C:\\hp\\bin\\Python\\lib\\site-packages',
  'C:\\hp\\bin\\Python\\lib\\site-packages\\win32',
  'C:\\hp\\bin\\Python\\lib\\site-packages\\win32\\lib',
  'C:\\hp\\bin\\Python\\lib\\site-packages\\Pythonwin']

 Server time:   Fri, 15 Feb 2013 21:04:10 +1100
 Error during template rendering

 In template C:\djcode\mysite\myapp\templates\myapp\detail.html, error at line 5
 u"'polls" is not a registered namespace
 1  <h1>{{ poll.question }}</h1>
 2  
 3  {% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
 4  
 5  {% url 'polls:vote' poll.id %}
 6  {% csrf_token %}
 7  {% for choice in poll.choice_set.all %}
 8  <input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" />
 9  <label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br />
 10     {% endfor %}
 11     <input type="submit" value="Vote" />
 12     </form>

现在我知道问题隐藏在detail.html,我的主要网址和我的应用程序myapp URLCONF和views.py中

现在我的主URLconf是:C:\ djcode\mysite\mysite

 from django.conf.urls import patterns, include, url
 from django.contrib import admin
 from django.conf import settings
 # Uncomment the next two lines to enable the admin:
 # from django.contrib import admin
 admin.autodiscover()

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

我的app文件夹名为myapp,这是myapp URLconf:C:\ djcode\mysite\myapp

 from django.conf.urls import patterns, include, url
 from django.contrib import admin
 from django.conf import settings

 from django.conf.urls import patterns, include, url

 urlpatterns = patterns('myapp.views',
     url(r'^$', 'index'),
     url(r'^(?P<poll_id>\d+)/$', 'detail'),
     url(r'^(?P<poll_id>\d+)/results/$', 'results'),
     url(r'^(?P<poll_id>\d+)/vote/$', 'vote'),


)

我在myapp中的views.py是:

 from django.http import HttpResponse
 from myapp.models import Poll ,choice
 from django.template import Context, loader
 from django.http import Http404
 from django.shortcuts import render_to_response, get_object_or_404
 from django.template import RequestContext

 def index(request):
     latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5]
     return render_to_response('myapp/index.html', {'latest_poll_list': latest_poll_list})

 def results(request, poll_id):
     p = get_object_or_404(Poll, pk=poll_id)
     return render_to_response('myapp/results.html', {'poll': p})

 def vote(request, poll_id):
     p = get_object_or_404(Poll, pk=poll_id)
     try:
         selected_choice = p.choice_set.get(pk=request.POST['choice'])
     except (KeyError, Choice.DoesNotExist):
         # Redisplay the poll voting form.
         return render_to_response('myapp/detail.html', {
             'poll': p,
             'error_message': "You didn't select a choice.",
         }, context_instance=RequestContext(request))
     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('myapp.views.results', args=(p.id,)))

 def detail(request, poll_id):
     p = get_object_or_404(Poll, pk=poll_id)
     return render_to_response('myapp/detail.html', {'poll': p},
                                context_instance=RequestContext(request))

我的detail.html C:\ djcode\mysite\myapp\templates\myapp

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

 {% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}

 {% url 'polls:vote' poll.id %}
 {% csrf_token %}
 {% for choice in poll.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>

Answer 1

请仔细阅读官方Django文档,您将找到最合适的答案.

答案是将命名空间添加到根URLconf.在mysite/urls.py文件(项目的urls.py,而不是应用程序的文件)中,继续并将其更改为包括命名空间:

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

此外,在教程命名空间URL名称的第3部分中,提到使用app_name作为添加轮询命名空间的可接受方式.您可以在此处添加polls/urls.py以下内容:

app_name = 'polls'
urlpatterns = [
    ...
]

Answer 2

遵循相同的Django教程并具有相同的名称,我不得不改变mysite/urls.py :

url(r'^polls/', include('polls.urls')),

至:

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

Answer 3

您需要将以下行添加到detail.html的顶部:

{% load url from future %}

(注意,您已经在index.html中使用了这一行,以便使用polls命名空间)

Answer 4

在myapp/urls.py中添加以下模块级属性:

app_name = "polls"

这将为该应用程序设置"应用程序命名空间名称".当您反向使用"polls:submit"这样的名称时,Django会查看两个位置:应用程序命名空间(如上所述)和实例命名空间(使用"url"函数中的namespace =参数设置).如果您的项目有多个应用程序实例,后者很重要,但通常它是您想要的前者.

我遇到了这个问题,并且在url()函数中将namespace =设置为某种方式似乎是错误的.

请参阅教程的以下条目:https://docs.djangoproject.com/en/1.9/intro/tutorial03/#namespacing-url-names

更新:此信息适用于Django 1.9.在1.9之前,为include添加namespace =属性确实是正确的方法.

Answer 5

Django 2.0

在yourapp/urls.py中

from django.urls import path
from . import views

app_name = 'yourapp'

urlpatterns = [
    path('homepage/', views.HomepageView.as_view(), name='homepage'),
]

在urls.py中

from django.contrib import admin
from django.urls import path, include


urlpatterns = [
    path('admin/', admin.site.urls),
    path('yourapp/', include('yourapp.urls')),
    ]

Answer 6

我想你错过了命名空间:

urlpatterns = patterns('',
    url(r'^polls/', include('polls.urls', namespace="polls")),
)

Answer 7

 from django.conf.urls import patterns, include, url
 from django.contrib import admin
 from django.conf import settings



 urlpatterns = patterns('myapp.views',
     url(r'^$', 'index', name="index"),
     url(r'^(?P<poll_id>\d+)/$', 'detail', name="detail"),
     url(r'^(?P<poll_id>\d+)/results/$', 'results', name="results"),
     url(r'^(?P<poll_id>\d+)/vote/$', 'vote', name="vote"),
)

----------------------------------    

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

 {% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}

 <form method="post" action="{% url myapp:vote poll.id %}">
 {% csrf_token %}
 {% for choice in poll.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>