Save the instance namespace during the resolving process as a 'current_app' request attribute

django/core/handlers/base.py

@@ -100,8 +100,9 @@ def get_response(self, request):
                         urlresolvers.set_urlconf(urlconf)
                         resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
 
-                    callback, callback_args, callback_kwargs = resolver.resolve(
-                            request.path_info)
+                    match = resolver.resolve(request.path_info)
+                    callback, callback_args, callback_kwargs = match
+                    request.current_app = match.namespace if match.namespace else None
 
                     # Apply view middleware
                     for middleware_method in self._view_middleware:

django/http/__init__.py

@@ -160,6 +160,7 @@ def __init__(self):
         self.path = ''
         self.path_info = ''
         self.method = None
+        self.current_app = None
         self._post_parse_error = False
 
     def __repr__(self):
@@ -756,4 +757,3 @@ def str_to_unicode(s, encoding):
         return six.text_type(s, encoding, 'replace')
     else:
         return s
-

django/shortcuts/__init__.py

@@ -36,7 +36,7 @@ def render(request, *args, **kwargs):
             raise ValueError('If you provide a context_instance you must '
                              'set its current_app before calling render()')
     else:
-        current_app = kwargs.pop('current_app', None)
+        current_app = kwargs.pop('current_app', request.current_app)
         context_instance = RequestContext(request, current_app=current_app)
 
     kwargs['context_instance'] = context_instance

docs/topics/http/shortcuts.txt

@@ -58,7 +58,8 @@ Optional arguments
 ``current_app``
     A hint indicating which application contains the current view. See the
     :ref:`namespaced URL resolution strategy <topics-http-reversing-url-namespaces>`
-    for more information.
+    for more information. This value defaults to the ``current_app`` attribute
+    of the ``request`` argument.
 
 Example
 -------

docs/topics/http/urls.txt

@@ -549,6 +549,10 @@ instance namespace. For example, the ``urls`` attribute of Django's
 all the patterns in an admin site, plus the name of the admin instance, and the
 application namespace ``admin``.
 
+Requests objects passed to your application views carry an additional
+``current_app`` attribute conaining the instance namespace for the URL pattern
+that matched the requested URL.
+
 Once you have defined namespaced URLs, you can reverse them. For details on
 reversing namespaced urls, see the documentation on :ref:`reversing namespaced
 URLs <topics-http-reversing-url-namespaces>`.

tests/regressiontests/requests/tests.py

@@ -21,6 +21,7 @@ def test_httprequest(self):
         self.assertEqual(request.POST.keys(), [])
         self.assertEqual(request.COOKIES.keys(), [])
         self.assertEqual(request.META.keys(), [])
+        self.assertEqual(request.current_app, None)
 
     def test_httprequest_repr(self):
         request = HttpRequest()