Including app URLs in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this Django URL inclusion?

Given the following urls.py setup, what URL pattern will match the path /blog/post/5/?

Django

from django.urls import path, include

# project urls.py
urlpatterns = [
    path('blog/', include('blog.urls')),
]

# blog/urls.py
from django.urls import path

urlpatterns = [
    path('post/<int:id>/', lambda request, id: id, name='post-detail'),
]

A /blog/post/5/ does not match any URL pattern

B /post/5/ matches and calls the view with id=5

C /blog/post/5/ matches but id is passed as a string '5'

D /blog/post/5/ matches and calls the view with id=5

💡 Hint

Remember how include() works with URL prefixes in Django.

The include('blog.urls') adds the blog/ prefix to all URLs defined in blog/urls.py. So post/5/ inside blog/urls.py becomes /blog/post/5/ in the project.

📝 Syntax

intermediate

Which option correctly includes app URLs in Django?

Choose the correct way to include the URLs from an app named shop inside the project's urls.py.

A path('shop/', include(shop.urls))

B path('shop/', include('shop.urls.py'))

C path('shop/', include('shop.urls'))

D path('shop/', include('shop'))

💡 Hint

The include() function expects a string with the module path to the app's urls.py.

Option C correctly passes the string 'shop.urls' to include(). Other options either miss quotes or use wrong module references.

🔧 Debug

advanced

Why does this URL inclusion cause an error?

Given this urls.py snippet, why does Django raise an error when starting the server?

Django

from django.urls import path, include

urlpatterns = [
    path('store/', include('store.urls')),
    path('store/', include('store.urls')),
]

A Duplicate URL patterns with the same prefix cause a conflict error

B The <code>include()</code> function cannot be called twice in the same file

C Missing trailing slash in the path causes the error

D Django requires app URLs to be included only once per project

💡 Hint

Think about what happens if two URL patterns match the same path prefix.

Defining two path('store/', ...) entries causes Django to have conflicting routes for the same URL prefix, which leads to errors or unexpected behavior.

❓ state_output

advanced

What is the value of request.resolver_match.app_name after including app URLs?

In the project urls.py, the app URLs are included as:

path('forum/', include(('forum.urls', 'forum'), namespace='forum'))

Inside a view called by /forum/thread/10/, what is the value of request.resolver_match.app_name?

A forum.urls

B forum

C None

D thread

💡 Hint

Check how the include() function sets the app_name when given as a tuple.

When including URLs with include(('forum.urls', 'forum'), namespace='forum'), the app_name is set to 'forum'. This is accessible via request.resolver_match.app_name.

🧠 Conceptual

expert

What happens if you include app URLs without a trailing slash in the path?

Consider this project urls.py snippet:

path('api', include('api.urls'))

What is the effect on URL matching and user requests?

A URLs must start with '/api' exactly, so '/api' matches but '/api/' does not

B Django automatically adds a trailing slash, so both '/api' and '/api/' work

C Requests to '/api/' will redirect to '/api' automatically

D No URLs under 'api' will match because the path is missing a trailing slash

💡 Hint

Think about how Django treats trailing slashes in path() definitions.

When the path is defined without a trailing slash, Django matches the exact string. So '/api' matches, but '/api/' does not unless explicitly handled.