[1.7.x] Fixed #21795 -- Made add_preserved_filters account for url prefixes.

Thanks to trac username honyczek for the report. Refs #6903.

Backport of 4339e9a9 from master

django/contrib/admin/templatetags/admin_urls.py

@@ -5,7 +5,7 @@ except ImportError:
 
 from django import template
 from django.contrib.admin.utils import quote
-from django.core.urlresolvers import resolve, Resolver404
+from django.core.urlresolvers import Resolver404, get_script_prefix, resolve
 from django.utils.http import urlencode
 
 register = template.Library()
@@ -33,8 +33,9 @@ def add_preserved_filters(context, url, popup=False, to_field=None):
     if opts and preserved_filters:
         preserved_filters = dict(parse_qsl(preserved_filters))
 
+        match_url = '/%s' % url.partition(get_script_prefix())[2]
         try:
-            match = resolve(url)
+            match = resolve(match_url)
         except Resolver404:
             pass
         else:

docs/releases/1.6.3.txt

@@ -30,5 +30,9 @@ several bugs in 1.6.2:
 * Fixed a regression in the :mod:`django.contrib.gis` SQL compiler for
   non-concrete fields (`#22250 <http://code.djangoproject.com/ticket/22250>`_).
 
+* Fixed :attr:`ModelAdmin.preserve_filters
+  <django.contrib.admin.ModelAdmin.preserve_filters>` when running a site with
+  a URL prefix (`#21795 <http://code.djangoproject.com/ticket/21795>`_).
+
 Additionally, Django's vendored version of six, :mod:`django.utils.six` has been
 upgraded to the latest release (1.6.1).

tests/admin_views/tests.py

@@ -11,16 +11,18 @@ from django.core import mail
 from django.core.checks import Error
 from django.core.files import temp as tempfile
 from django.core.exceptions import ImproperlyConfigured
-from django.core.urlresolvers import reverse, NoReverseMatch
+from django.core.urlresolvers import (NoReverseMatch,
+    get_script_prefix, reverse, set_script_prefix)
 # Register auth models with the admin.
 from django.contrib.auth import get_permission_codename
 from django.contrib.admin import ModelAdmin
 from django.contrib.admin.helpers import ACTION_CHECKBOX_NAME
 from django.contrib.admin.models import LogEntry, DELETION
+from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
+from django.contrib.admin.tests import AdminSeleniumWebDriverTestCase
 from django.contrib.admin.utils import quote
 from django.contrib.admin.validation import ModelAdminValidator
 from django.contrib.admin.views.main import IS_POPUP_VAR
-from django.contrib.admin.tests import AdminSeleniumWebDriverTestCase
 from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.contrib.auth.models import Group, User, Permission
 from django.contrib.contenttypes.models import ContentType
@@ -4440,11 +4442,14 @@ class AdminKeepChangeListFiltersTests(TestCase):
     def tearDown(self):
         self.client.logout()
 
-    def get_changelist_filters_querystring(self):
-        return urlencode({
+    def get_changelist_filters(self):
+        return {
             'is_superuser__exact': 0,
             'is_staff__exact': 0,
-        })
+        }
+
+    def get_changelist_filters_querystring(self):
+        return urlencode(self.get_changelist_filters())
 
     def get_preserved_filters_querystring(self):
         return urlencode({
@@ -4586,6 +4591,29 @@ class AdminKeepChangeListFiltersTests(TestCase):
         response = self.client.post(self.get_delete_url(), {'post': 'yes'})
         self.assertRedirects(response, self.get_changelist_url())
 
+    def test_url_prefix(self):
+        context = {
+            'preserved_filters': self.get_preserved_filters_querystring(),
+            'opts': User._meta,
+        }
+
+        url = reverse('admin:auth_user_changelist', current_app=self.admin_site.name)
+        self.assertEqual(
+            self.get_changelist_url(),
+            add_preserved_filters(context, url),
+        )
+
+        original_prefix = get_script_prefix()
+        try:
+            set_script_prefix('/prefix/')
+            url = reverse('admin:auth_user_changelist', current_app=self.admin_site.name)
+            self.assertEqual(
+                self.get_changelist_url(),
+                add_preserved_filters(context, url),
+            )
+        finally:
+            set_script_prefix(original_prefix)
+
 
 class NamespacedAdminKeepChangeListFiltersTests(AdminKeepChangeListFiltersTests):
     admin_site = site2