Django Error u“'polls” is not a registered namespace

Question

Yesterday I was working on my first app using this tutorial. It\'s a Poll and Choice app. The first page displays the question and when you click on the question it\'s suppose t

Answer 1

I think you missed the namespace:

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

Answer 2

Django 2.0

in yourapp/urls.py

from django.urls import path
from . import views

app_name = 'yourapp'

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

in urls.py

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


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

Answer 3

namespace should be added polls/urls.py file.

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

Answer 4

 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>

Answer 5

I also faced the same issue. it is fixed now by adding app_name = "<name of your app>" in app/urls.py

Answer 6

For anyone using "django-hosts":

I had the same error and for me adding this to my template solved it (without any us of namespace etc.):

{% load hosts %}
<a href="{% host_url 'YOUR_URL' host 'YOUR_HOST' %}">Admin dashboard</a>

Additionaly I added PARENT_HOST = 'YOUR_PARENT_HOST' to my settings.py

Reference