404 error for "Views by namespace admin" at Admin Docs

[Girish]

I am currently running the master version of the django github project (on 5th Jun 2015 10:46 am).

I followed the instructions (​https://docs.djangoproject.com/en/dev/ref/contrib/admin/admindocs/)
to install the admin docs to my django application. Don't forget to install docutils using pip.

If you go the following url (Admin doc):
​http://127.0.0.1:8000/admin/doc/

and choose Views and you should get to ​http://127.0.0.1:8000/admin/doc/views/

there you should find two section

1. Views by empty namespace
2. Views by namespace admin

the links to Views by empty namespace works fine but Views by namespace admin leads to
404 error.

[Rigel Di Scala]

I'll take a look at it.

[Rigel Di Scala]

I am able to reproduce this in 1.9.dev20150607202342.

[Rigel Di Scala]

I believe the problem might be due to the fact that those views are actually methods of django.contrib.admin.sites.AdminSite.

[lordscales91]

I think I've spotted where the issue comes from. When you use namespaced urls on your ROOT_URL_CONF you will have RegexURLResolver instances in your patterns, but the _callback_strs are not properly added, maybe it's better to show you a snippet from the actual code on django.core.urlresolvers at version 1.8.4 (I added the comment at the end)

            if isinstance(pattern, RegexURLResolver):
                if pattern.namespace:
                    namespaces[pattern.namespace] = (p_pattern, pattern)
                    if pattern.app_name:
                        apps.setdefault(pattern.app_name, []).append(pattern.namespace)
                else:
                    parent_pat = pattern.regex.pattern
                    for name in pattern.reverse_dict:
                        for matches, pat, defaults in pattern.reverse_dict.getlist(name):
                            new_matches = normalize(parent_pat + pat)
                            lookups.appendlist(
                                name,
                                (
                                    new_matches,
                                    p_pattern + pat,
                                    dict(defaults, **pattern.default_kwargs),
                                )
                            )
                    for namespace, (prefix, sub_pattern) in pattern.namespace_dict.items():
                        namespaces[namespace] = (p_pattern + prefix, sub_pattern)
                    for app_name, namespace_list in pattern.app_dict.items():
                        apps.setdefault(app_name, []).extend(namespace_list)
                    self._callback_strs.update(pattern._callback_strs) # This should be done even if a namespace is specified I think

[Markus Holtermann]

PR: ​https://github.com/django/django/pull/6795

[Markus Holtermann]

This is a regression from #23601

[Tim Graham <timograham@…>]

In 625b8e92:

Fixed #24931 -- Made namespaced RegexURLResolvers populate callback strings.

Fixed a regression in 2f16ff5a6cbd71fc6c50e88e4087f3657222e90e.

Thanks Tim Graham for the review.

[Tim Graham <timograham@…>]

In 31a789f:

[1.10.x] Fixed #24931 -- Made namespaced RegexURLResolvers populate callback strings.

Fixed a regression in 2f16ff5a6cbd71fc6c50e88e4087f3657222e90e.

Thanks Tim Graham for the review.

Backport of 625b8e9295d79650208bfb3fca8bf9e6aaf578e4 from master