Django URL Routing and reverse() Resolution

Snippet

Django URL Routing and reverse() Resolution

Django's URL routing system uses named patterns with reverse resolution. The reverse() function generates URLs from their name and parameters, making your code more maintainable by decoupling URL structure from views. The app_name namespace prevents naming conflicts between apps.

snippet.py
python
# urls.py
from django.urls import path
from . import views
 
app_name = 'blog'
 
urlpatterns = [
    path('article/<int:year>/<slug:slug>/', views.article_detail, name='article_detail'),
    path('archive/', views.archive, name='archive'),
]
 
# views.py
from django.shortcuts import get_object_or_404
from django.urls import reverse
from .models import Article
 
 
def article_detail(request, year, slug):
    article = get_object_or_404(Article, pub_date__year=year, slug=slug)
    share_url = request.build_absolute_uri(
        reverse('blog:article_detail', args=[year, slug])
    )
    return render(request, 'blog/detail.html', {'article': article, 'share_url': share_url})
 
def archive(request):
    archive_url = reverse('blog:archive')  # /archive/
    return redirect(archive_url)

django

Breakdown

app_name = 'blog'

Namespaces the URL patterns for this app to avoid conflicts with other apps

path('article/<int:year>/<slug:slug>/', ...

Defines URL pattern with type converters: int and slug for dynamic segments

name='article_detail'

Names this pattern for reverse resolution in templates and views

request.build_absolute_uri(reverse(...))

Builds full absolute URL including domain for sharing purposes

reverse('blog:article_detail', args=[year, slug])

Reverses URL by app namespace and name, passing positional arguments

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Django URL Routing and reverse() Resolution

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