Fixed #21587 -- Added a warning for changing default of RedirectView.permanent.

django/views/generic/base.py

 from __future__ import unicode_literals
 
 import logging
+import warnings
 from functools import update_wrapper
 
 from django import http
@@ -8,8 +9,10 @@ from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import reverse, NoReverseMatch
 from django.template.response import TemplateResponse
 from django.utils.decorators import classonlymethod
+from django.utils.deprecation import RemovedInDjango19Warning
 from django.utils import six
 
+_sentinel = object()
 logger = logging.getLogger('django.request')
 
 
@@ -48,7 +51,6 @@ class View(object):
         """
         Main entry point for a request-response process.
         """
-        # sanitize keyword arguments
         for key in initkwargs:
             if key in cls.http_method_names:
                 raise TypeError("You tried to pass in the %s method name as a "
@@ -159,11 +161,23 @@ class RedirectView(View):
     """
     A view that provides a redirect on any GET request.
     """
-    permanent = True
+    permanent = _sentinel
     url = None
     pattern_name = None
     query_string = False
 
+    def __init__(self, *args, **kwargs):
+        if 'permanent' not in kwargs and self.permanent is _sentinel:
+            warnings.warn(
+                "Default value of 'RedirectView.permanent' will change "
+                "from True to False in Django 1.9. Set an explicit value "
+                "to silence this warning.",
+                RemovedInDjango19Warning,
+                stacklevel=3
+            )
+            self.permanent = True
+        super(RedirectView, self).__init__(*args, **kwargs)
+
     def get_redirect_url(self, *args, **kwargs):
         """
         Return the URL redirect to. Keyword arguments from the

docs/internals/deprecation.txt

@@ -214,6 +214,10 @@ details on these changes.
 * The `cache_choices` option to :class:`~django.forms.ModelChoiceField` and
   :class:`~django.forms.ModelMultipleChoiceField` will be removed.
 
+* The default value of the
+  :attr:`RedirectView.permanent <django.views.generic.base.RedirectView.permanent>`
+  attribute will change from ``True`` to ``False``.
+
 .. _deprecation-removed-in-1.8:
 
 1.8

docs/ref/class-based-views/base.txt

@@ -222,6 +222,11 @@ RedirectView
         status code 301. If ``False``, then the redirect will use status code
         302. By default, ``permanent`` is ``True``.
 
+        .. deprecated:: 1.8
+
+            The default value of the ``permanent`` attribute will change from
+            ``True`` to ``False`` in Django 1.9.
+
     .. attribute:: query_string
 
         Whether to pass along the GET query string to the new location. If

docs/releases/1.8.txt

@@ -1097,6 +1097,13 @@ deprecated: you should rename your ``qn`` arguments to ``compiler``, and call
 ``compiler.quote_name_unless_alias(...)`` where you previously called
 ``qn(...)``.
 
+Default value of ``RedirectView.permanent``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The default value of the
+:attr:`RedirectView.permanent <django.views.generic.base.RedirectView.permanent>`
+attribute will change from ``True`` to ``False`` in Django 1.9.
+
 .. removed-features-1.8:
 
 Features removed in 1.8

tests/generic_views/test_base.py

@@ -2,10 +2,14 @@ from __future__ import unicode_literals
 
 import time
 import unittest
+import warnings
 
 from django.core.exceptions import ImproperlyConfigured
 from django.http import HttpResponse
+from django.utils import six
+from django.utils.deprecation import RemovedInDjango19Warning
 from django.test import TestCase, RequestFactory, override_settings
+from django.test.utils import IgnoreDeprecationWarningsMixin
 from django.views.generic import View, TemplateView, RedirectView
 
 from . import views
@@ -328,7 +332,7 @@ class TemplateViewTest(TestCase):
 
 
 @override_settings(ROOT_URLCONF='generic_views.urls')
-class RedirectViewTest(TestCase):
+class RedirectViewTest(IgnoreDeprecationWarningsMixin, TestCase):
 
     rf = RequestFactory()
 
@@ -440,6 +444,69 @@ class RedirectViewTest(TestCase):
         self.assertEqual(response.status_code, 410)
 
 
+@override_settings(ROOT_URLCONF='generic_views.urls')
+class RedirectViewDeprecationTest(TestCase):
+
+    rf = RequestFactory()
+
+    def test_deprecation_warning_init(self):
+        with warnings.catch_warnings(record=True) as warns:
+            warnings.simplefilter('always')
+
+            view = RedirectView()
+            response = view.dispatch(self.rf.head('/python/'))
+
+        self.assertEqual(response.status_code, 410)
+        self.assertEqual(len(warns), 1)
+        self.assertIs(warns[0].category, RemovedInDjango19Warning)
+        self.assertEqual(
+            six.text_type(warns[0].message),
+            "Default value of 'RedirectView.permanent' will change "
+            "from True to False in Django 1.9. Set an explicit value "
+            "to silence this warning.",
+        )
+
+    def test_deprecation_warning_raised_when_permanent_not_passed(self):
+        with warnings.catch_warnings(record=True) as warns:
+            warnings.simplefilter('always')
+
+            view_function = RedirectView.as_view(url='/bbb/')
+            request = self.rf.request(PATH_INFO='/aaa/')
+            view_function(request)
+
+        self.assertEqual(len(warns), 1)
+        self.assertIs(warns[0].category, RemovedInDjango19Warning)
+        self.assertEqual(
+            six.text_type(warns[0].message),
+            "Default value of 'RedirectView.permanent' will change "
+            "from True to False in Django 1.9. Set an explicit value "
+            "to silence this warning.",
+        )
+
+    def test_no_deprecation_warning_when_permanent_passed(self):
+        with warnings.catch_warnings(record=True) as warns:
+            warnings.simplefilter('always')
+
+            view_function = RedirectView.as_view(url='/bar/', permanent=False)
+            request = self.rf.request(PATH_INFO='/foo/')
+            view_function(request)
+
+        self.assertEqual(len(warns), 0)
+
+    def test_no_deprecation_warning_with_custom_redirectview(self):
+        class CustomRedirectView(RedirectView):
+            permanent = False
+
+        with warnings.catch_warnings(record=True) as warns:
+            warnings.simplefilter('always')
+
+            view_function = CustomRedirectView.as_view(url='/eggs/')
+            request = self.rf.request(PATH_INFO='/spam/')
+            view_function(request)
+
+        self.assertEqual(len(warns), 0)
+
+
 class GetContextDataTest(unittest.TestCase):
 
     def test_get_context_data_super(self):

tests/test_client/tests.py

@@ -22,8 +22,11 @@ rather than the HTML rendered to the end-user.
 """
 from __future__ import unicode_literals
 
+import warnings
+
 from django.core import mail
 from django.http import HttpResponse
+from django.utils.deprecation import RemovedInDjango19Warning
 from django.test import Client, TestCase, RequestFactory
 from django.test import override_settings
 
@@ -174,14 +177,18 @@ class ClientTest(TestCase):
 
     def test_permanent_redirect(self):
         "GET a URL that redirects permanently elsewhere"
-        response = self.client.get('/permanent_redirect_view/')
-        # Check that the response was a 301 (permanent redirect)
-        self.assertRedirects(response, 'http://testserver/get_view/', status_code=301)
-
-        client_providing_host = Client(HTTP_HOST='django.testserver')
-        response = client_providing_host.get('/permanent_redirect_view/')
-        # Check that the response was a 301 (permanent redirect) with absolute URI
-        self.assertRedirects(response, 'http://django.testserver/get_view/', status_code=301)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/permanent_redirect_view/')
+            # Check that the response was a 301 (permanent redirect)
+            self.assertRedirects(response, 'http://testserver/get_view/', status_code=301)
+
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            client_providing_host = Client(HTTP_HOST='django.testserver')
+            response = client_providing_host.get('/permanent_redirect_view/')
+            # Check that the response was a 301 (permanent redirect) with absolute URI
+            self.assertRedirects(response, 'http://django.testserver/get_view/', status_code=301)
 
     def test_temporary_redirect(self):
         "GET a URL that does a non-permanent redirect"
@@ -191,26 +198,34 @@ class ClientTest(TestCase):
 
     def test_redirect_to_strange_location(self):
         "GET a URL that redirects to a non-200 page"
-        response = self.client.get('/double_redirect_view/')
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/double_redirect_view/')
 
-        # Check that the response was a 302, and that
-        # the attempt to get the redirection location returned 301 when retrieved
-        self.assertRedirects(response, 'http://testserver/permanent_redirect_view/', target_status_code=301)
+            # Check that the response was a 302, and that
+            # the attempt to get the redirection location returned 301 when retrieved
+            self.assertRedirects(response, 'http://testserver/permanent_redirect_view/', target_status_code=301)
 
     def test_follow_redirect(self):
         "A URL that redirects can be followed to termination."
-        response = self.client.get('/double_redirect_view/', follow=True)
-        self.assertRedirects(response, 'http://testserver/get_view/', status_code=302, target_status_code=200)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/double_redirect_view/', follow=True)
+            self.assertRedirects(response, 'http://testserver/get_view/', status_code=302, target_status_code=200)
         self.assertEqual(len(response.redirect_chain), 2)
 
     def test_redirect_http(self):
         "GET a URL that redirects to an http URI"
-        response = self.client.get('/http_redirect_view/', follow=True)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/http_redirect_view/', follow=True)
         self.assertFalse(response.test_was_secure_request)
 
     def test_redirect_https(self):
         "GET a URL that redirects to an https URI"
-        response = self.client.get('/https_redirect_view/', follow=True)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/https_redirect_view/', follow=True)
         self.assertTrue(response.test_was_secure_request)
 
     def test_notfound_response(self):

tests/urlpatterns_reverse/tests.py

@@ -18,7 +18,7 @@ from django.http import HttpRequest, HttpResponseRedirect, HttpResponsePermanent
 from django.shortcuts import redirect
 from django.test import TestCase, override_settings
 from django.utils import six
-from django.utils.deprecation import RemovedInDjango20Warning
+from django.utils.deprecation import RemovedInDjango19Warning, RemovedInDjango20Warning
 
 from admin_scripts.tests import AdminScriptTestCase
 
@@ -309,8 +309,10 @@ class ResolverTests(unittest.TestCase):
 class ReverseLazyTest(TestCase):
 
     def test_redirect_with_lazy_reverse(self):
-        response = self.client.get('/redirect/')
-        self.assertRedirects(response, "/redirected_to/", status_code=301)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RemovedInDjango19Warning)
+            response = self.client.get('/redirect/')
+            self.assertRedirects(response, "/redirected_to/", status_code=301)
 
     def test_user_permission_with_lazy_reverse(self):
         User.objects.create_user('alfred', 'alfred@example.com', password='testpw')