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Python Django Basics Final Details url Tag

Flore W
Flore W
4,743 Points

Namespace error with Django 2.0

Hi all, I can't make namespace work with Django 2.0. I checked on the documentation, and it says that you have to define the app_name. But I don't know which app_name to give and also in which file... can someone help me please? Everything else until then works as in the video.

That's my learning_site/urls.py file

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

from . import views

app_name = 'learning_site'

urlpatterns = [
    path('courses/', include('courses.urls', namespace='courses')),
    path('admin/', admin.site.urls),
    path('', views.hello_world, name='home'),

urlpatterns += staticfiles_urlpatterns()

And that's for example my course_list.html file

{% extends "layout.html" %}

{% block title %}Available Courses{% endblock %}

{% block content %}
<div class="cards">
    {% for course in courses %}
    <div class="card">
        <header><a href="{% url 'courses:detail' pk=course.pk %}">{{ course.title }}</a></header>
        <div class="card-copy">
            {{ course.description }}
    {% endfor %}
{% endblock %}

I get the error: "Django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead."

2 Answers

I had the same issue, but it seems that in Django 2 you need to add a name to your app in order to use namespacing.

I edited my courses/urls.py folder to include an app_name attribute of "courses" and the server stopped complaining.


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

from . import views

app_name = "courses"

urlpatterns = [
    path('', views.course_list, name='list'),
    path('<int:course_pk>/<int:step_pk>/', views.step_detail,
    path('<int:pk>/', views.course_detail, name='course_detail'),

I don't know if that app_name attribute has to match the namespacing or if there are any other requirements, but this worked for me for this project. Hope it helps.

Cheers, Owen

Flore W
Flore W
4,743 Points

Thanks Owen, this solved the issue! Thinking back it does make sense to give a name to that courses/urls.py file, so that whenever anything from that file is referenced inside the html files, we can just call it by [namespace]:[name].

Thanks a lot, Owen this is really helpful.