Suppressed the `if Site._meta.installed` pattern.

The purpose of this construct is to test if the django.contrib.sites
application is installed. But in Django 1.9 it will be forbidden to
import the Site model when the django.contrib.sites application isn't
installed.

No model besides Site used this pattern.

Refs #21719, #21923.

django/contrib/auth/tests/test_views.py

@@ -3,8 +3,8 @@ import itertools
 import os
 import re
 
+from django.apps import apps
 from django.conf import global_settings, settings
-from django.contrib.sites.models import Site
 from django.contrib.sites.requests import RequestSite
 from django.contrib.admin.models import LogEntry
 from django.contrib.auth.models import User
@@ -446,7 +446,8 @@ class LoginTest(AuthViewsTestCase):
     def test_current_site_in_context_after_login(self):
         response = self.client.get(reverse('login'))
         self.assertEqual(response.status_code, 200)
-        if Site._meta.installed:
+        if apps.is_installed('django.contrib.sites'):
+            Site = apps.get_model('sites.Site')
             site = Site.objects.get_current()
             self.assertEqual(response.context['site'], site)
             self.assertEqual(response.context['site_name'], site.name)

django/contrib/contenttypes/views.py

@@ -1,9 +1,9 @@
 from __future__ import unicode_literals
 
 from django import http
+from django.apps import apps
 from django.contrib.contenttypes.models import ContentType
-from django.contrib.sites.models import Site
-from django.contrib.sites.shortcuts import get_current_site
+from django.contrib.sites.requests import RequestSite
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils.translation import ugettext as _
 
@@ -41,7 +41,9 @@ def shortcut(request, content_type_id, object_id):
     # relation to the Site object
     object_domain = None
 
-    if Site._meta.installed:
+    if apps.is_installed('django.contrib.sites'):
+        Site = apps.get_model('sites.Site')
+
         opts = obj._meta
 
         # First, look for an many-to-many relationship to Site.
@@ -70,10 +72,14 @@ def shortcut(request, content_type_id, object_id):
         # Fall back to the current site (if possible).
         if object_domain is None:
             try:
-            object_domain = get_current_site(request).domain
+                object_domain = Site.objects.get_current().domain
             except Site.DoesNotExist:
                 pass
 
+    else:
+        # Fall back to the current request's site.
+        object_domain = RequestSite(request).domain
+
     # If all that malarkey found an object domain, use it. Otherwise, fall back
     # to whatever get_absolute_url() returned.
     if object_domain is not None:

django/contrib/sitemaps/__init__.py

@@ -1,9 +1,10 @@
-from django.contrib.sites.models import Site
+from django.apps import apps as django_apps
 from django.core import urlresolvers, paginator
 from django.core.exceptions import ImproperlyConfigured
 from django.utils.six.moves.urllib.parse import urlencode
 from django.utils.six.moves.urllib.request import urlopen
 
+
 PING_URL = "http://www.google.com/webmasters/tools/ping"
 
 
@@ -32,6 +33,9 @@ def ping_google(sitemap_url=None, ping_url=PING_URL):
     if sitemap_url is None:
         raise SitemapNotFound("You didn't provide a sitemap_url, and the sitemap URL couldn't be auto-detected.")
 
+    if not django_apps.is_installed('django.contrib.sites'):
+        raise ImproperlyConfigured("ping_google requires django.contrib.sites, which isn't installed.")
+    Site = django_apps.get_model('sites.Site')
     current_site = Site.objects.get_current()
     url = "http://%s%s" % (current_site.domain, sitemap_url)
     params = urlencode({'sitemap': url})
@@ -75,7 +79,8 @@ class Sitemap(object):
 
         # Determine domain
         if site is None:
-            if Site._meta.installed:
+            if django_apps.is_installed('django.contrib.sites'):
+                Site = django_apps.get_model('sites.Site')
                 try:
                     site = Site.objects.get_current()
                 except Site.DoesNotExist:
@@ -111,6 +116,9 @@ class Sitemap(object):
 
 class FlatPageSitemap(Sitemap):
     def items(self):
+        if not django_apps.is_installed('django.contrib.sites'):
+            raise ImproperlyConfigured("ping_google requires django.contrib.sites, which isn't installed.")
+        Site = django_apps.get_model('sites.Site')
         current_site = Site.objects.get_current()
         return current_site.flatpage_set.filter(registration_required=False)
 

django/contrib/sitemaps/tests/base.py

@@ -1,11 +1,10 @@
-from django.contrib.sites.models import Site
+from django.apps import apps
 from django.core.cache import cache
 from django.db import models
 from django.test import TestCase
 
 
 class TestModel(models.Model):
-    "A test model for "
     name = models.CharField(max_length=100)
 
     class Meta:
@@ -20,7 +19,8 @@ class TestModel(models.Model):
 
 class SitemapTestsBase(TestCase):
     protocol = 'http'
-    domain = 'example.com' if Site._meta.installed else 'testserver'
+    sites_installed = apps.is_installed('django.contrib.sites')
+    domain = 'example.com' if sites_installed else 'testserver'
     urls = 'django.contrib.sitemaps.tests.urls.http'
 
     def setUp(self):