如何修复"'polls‘不是已注册的命名空间“错误的"NoReverseMatch at /polls/”？

Question

我的mysite/urls.py是

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

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^polls/', include('polls.urls')),
]+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

并且，我的polls/urls.py是

from .import views
from django.conf.urls import url

from django.contrib.auth.views import login

urlpatterns= [
    url(r'^$',views.index, name= "index"),
    #127.0.0.1/polls
    url(r'^(?P<question_id>[0-9]+)/$', views.detail, name= "detail"),
    #127.0.0.1/polls/1
    url(r'^(?P<question_id>[0-9]+)/results$', views.results, name="results"),
    #127.0.0.1/polls/1/results
    url(r'^(?P<question_id>[0-9]+)/vote$', views.vote, name="vote"),
    #127.0.0.1/polls/1/vote
    url(r'^login/$', login, {'template_name': 'polls/login.html'})
]

我得到的错误是没有注册的命名空间作为轮询。一定要帮上忙。

Answer 1

在mysite/urls.py文件中，更改以下行：

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

到这一行：

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

Answer 2

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^polls/', include('polls.urls', namespace="polls")),
]+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

polls/urls.py应该有

app_name = 'polls' #This line is missing
urlpatterns= [
    url(r'^$',views.index, name= "index"),
    #127.0.0.1/polls
    url(r'^(?P<question_id>[0-9]+)/$', views.detail, name= "detail"),
    #127.0.0.1/polls/1
    url(r'^(?P<question_id>[0-9]+)/results$', views.results, name="results"),
    #127.0.0.1/polls/1/results
    url(r'^(?P<question_id>[0-9]+)/vote$', views.vote, name="vote"),
    #127.0.0.1/polls/1/vote
    url(r'^login/$', login, {'template_name': 'polls/login.html'})
]