Django cross-site reverse URLs

Question

Probably simple question and I\'m just missing something, but I\'m stuck out of ideas.

I have Django project serving several sites with distinct sessions.py

Answer 1

Yes, you'd need to make your own {% url %} tag which uses it's own reversal method.

For example, to reverse specifically against the site_a urlconf then you could use a method like this:

from django.core.urlresolvers import reverse
import site_a

def site_a_reverse(viewname, args=None, kwargs=None):
    # If your sites share the same database, you could get prefix from Site.objects.get(pk=site_a.settings.SITE_ID)
    prefix = 'http://a.example.com/'  # Note, you need the trailing slash
    reverse(viewname, urlconf=site_a.urls, args=args, kwargs=kwargs, prefix=prefix)

Answer 2

I've implemented it by overriding django.core.urlresolvers.reverse with my custom function:

from django.core import urlresolvers
from django.conf import settings

__real_reverse = urlresolvers.reverse

def reverse(viewname, urlconf=None, args=None, kwargs=None, prefix=None):
    try:
        return __real_reverse(viewname, urlconf, args, kwargs, prefix)
    except urlresolvers.NoReverseMatch, no_match:
        external_urlconfs = getattr(settings, 'EXTERNAL_URLCONFS', [])
        for p, c in external_urlconfs:
            c = urlresolvers.RegexURLResolver(r'^/', c)
            try:
                return p + c.reverse(viewname, *args, **kwargs)
            except urlresolvers.NoReverseMatch:
                pass
        raise no_match

urlresolvers.reverse = reverse

Then listing URLconfs in settings.py like this:

ROOT_URLCONF = 'project.urls_a'

EXTERNAL_URLCONFS = (
    ('http://b.example.com/', 'project.urls_b'),
)

Answer 3

Reverse overwrite for Django 1.7.x using the same settings from @drdaeman

# -*- coding: utf-8 -*-
from django.core import urlresolvers
from django.conf import settings

__real_reverse = urlresolvers.reverse


def reverse(viewname, urlconf=None, args=None, kwargs=None, prefix=None, current_app=None):
    try:
        return __real_reverse(viewname, urlconf, args, kwargs, prefix, current_app)
    except urlresolvers.NoReverseMatch, no_match:
        external_urlconfs = getattr(settings, 'EXTERNAL_URLCONFS', [])
        for p, c in external_urlconfs:
            urlconf = c
            try:
                return p + __real_reverse(viewname, urlconf, args, kwargs, prefix, current_app)
            except urlresolvers.NoReverseMatch:
                pass
        raise no_match

urlresolvers.reverse = reverse

I placed the code in the urls.py file to execute at startup

Answer 4

I would suggest making two changes. (1) Move templates to a common directory (rather than per-application) if you already haven't. (2) Investigate the newly added URL namespaces feature.

The first change will allow you to have a common base template and selectively override it for various apps/sites. The second might serve to make your URLs "drier".