Automatically set the current URL namespace based on the URL of the current request

[Aymeric Augustin]

The ​documentation on URL namespaces shows the following example:

def render_to_response(self, context, **response_kwargs):
    self.request.current_app = self.request.resolver_match.namespace
    return super(DetailView, self).render_to_response(context, **response_kwargs)

self.request.current_app = self.request.resolver_match.namespace looks like something that makes sense in general and could be done automatically for all requests.

This became possible in Django 1.8 because current_app is now an attribute of the request object.

There are some fairly obvious backwards-compatibility concerns, but this change looks like it could save a lot of boilerplate code.

[Tim Graham]

I felt awkward when I added that documentation.

[Tim Graham]

Marten, do you plan to move forward with this ticket? It should ease the deprecation in #24126 a bit as I noted there, I think.

[Marten Kenbeek]

Yes, working on it: ​https://github.com/django/django/pull/4919

[Marten Kenbeek <marten.knbk@…>]

In 6364df6:

Refs #24127 -- Added documentation for HttpRequest.current_app.

[Tim Graham <timograham@…>]

In ae93aee:

[1.8.x] Refs #24127 -- Added documentation for HttpRequest.current_app.

Backport of 6364df68879efc0d9451d6427e34b4542e3d7e0b from master

[Tim Graham <timograham@…>]

In bc7923b:

Fixed #24127 -- Changed the default current_app to the current namespace.

Changed the url template tag to use request.resolver_match.namespace as a
default for the current_app argument if request.current_app is not set.