Fixed #21718 -- Renamed has_app to is_installed.

django/apps/registry.py

@@ -192,7 +192,7 @@ class Apps(object):
         app_models[model_name] = model
         self.clear_cache()
 
-    def has_app(self, app_name):
+    def is_installed(self, app_name):
         """
         Checks whether an application with this name exists in the registry.
 

django/contrib/admin/sites.py

@@ -160,10 +160,10 @@ class AdminSite(object):
         The default implementation checks that admin and contenttypes apps are
         installed, as well as the auth context processor.
         """
-        if not apps.has_app('django.contrib.admin'):
+        if not apps.is_installed('django.contrib.admin'):
             raise ImproperlyConfigured("Put 'django.contrib.admin' in your "
                 "INSTALLED_APPS setting in order to use the admin application.")
-        if not apps.has_app('django.contrib.contenttypes'):
+        if not apps.is_installed('django.contrib.contenttypes'):
             raise ImproperlyConfigured("Put 'django.contrib.contenttypes' in "
                 "your INSTALLED_APPS setting in order to use the admin application.")
         if 'django.contrib.auth.context_processors.auth' not in settings.TEMPLATE_CONTEXT_PROCESSORS:

django/contrib/admin/templatetags/admin_static.py

@@ -3,7 +3,7 @@ from django.template import Library
 
 register = Library()
 
-if apps.has_app('django.contrib.staticfiles'):
+if apps.is_installed('django.contrib.staticfiles'):
     from django.contrib.staticfiles.templatetags.staticfiles import static
 else:
     from django.templatetags.static import static

django/contrib/messages/tests/base.py

@@ -15,7 +15,7 @@ from django.utils.translation import ugettext_lazy
 
 def skipUnlessAuthIsInstalled(func):
     return skipUnless(
-        apps.has_app('django.contrib.auth'),
+        apps.is_installed('django.contrib.auth'),
         "django.contrib.auth isn't installed")(func)
 
 

django/contrib/redirects/middleware.py

@@ -15,7 +15,7 @@ class RedirectFallbackMiddleware(object):
     response_redirect_class = http.HttpResponsePermanentRedirect
 
     def __init__(self):
-        if not apps.has_app('django.contrib.sites'):
+        if not apps.is_installed('django.contrib.sites'):
             raise ImproperlyConfigured(
                 "You cannot use RedirectFallbackMiddleware when "
                 "django.contrib.sites is not installed."

django/contrib/sitemaps/tests/test_flatpages.py

@@ -10,7 +10,7 @@ from .base import SitemapTestsBase
 
 class FlatpagesSitemapTests(SitemapTestsBase):
 
-    @skipUnless(apps.has_app('django.contrib.flatpages'),
+    @skipUnless(apps.is_installed('django.contrib.flatpages'),
                 "django.contrib.flatpages app not installed.")
     def test_flatpage_sitemap(self):
         "Basic FlatPage sitemap test"

django/contrib/sitemaps/tests/test_http.py

@@ -118,7 +118,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 """ % date.today()
         self.assertXMLEqual(response.content.decode('utf-8'), expected_content)
 
-    @skipUnless(apps.has_app('django.contrib.sites'),
+    @skipUnless(apps.is_installed('django.contrib.sites'),
                 "django.contrib.sites app not installed.")
     def test_sitemap_get_urls_no_site_1(self):
         """

django/test/client.py

@@ -390,7 +390,7 @@ class Client(RequestFactory):
         """
         Obtains the current session variables.
         """
-        if apps.has_app('django.contrib.sessions'):
+        if apps.is_installed('django.contrib.sessions'):
             engine = import_module(settings.SESSION_ENGINE)
             cookie = self.cookies.get(settings.SESSION_COOKIE_NAME, None)
             if cookie:
@@ -551,7 +551,7 @@ class Client(RequestFactory):
         """
         user = authenticate(**credentials)
         if (user and user.is_active and
-                apps.has_app('django.contrib.sessions')):
+                apps.is_installed('django.contrib.sessions')):
             engine = import_module(settings.SESSION_ENGINE)
 
             # Create a fake request that goes through request middleware

docs/ref/applications.txt

@@ -203,7 +203,7 @@ Application registry
     given ``app_label``. Raises :exc:`~exceptions.LookupError` if no such
     application exists.
 
-.. method:: apps.has_app(app_name)
+.. method:: apps.is_installed(app_name)
 
     Checks whether an application with the given name exists in the registry.
     ``app_name`` is the full name of the app, e.g. 'django.contrib.admin'.

tests/apps/tests.py

@@ -107,10 +107,10 @@ class AppsTests(TestCase):
             apps.get_app_config('webdesign')
 
     @override_settings(INSTALLED_APPS=SOME_INSTALLED_APPS)
-    def test_has_app(self):
-        self.assertTrue(apps.has_app('django.contrib.admin'))
-        self.assertTrue(apps.has_app('django.contrib.staticfiles'))
-        self.assertFalse(apps.has_app('django.contrib.webdesign'))
+    def test_is_installed(self):
+        self.assertTrue(apps.is_installed('django.contrib.admin'))
+        self.assertTrue(apps.is_installed('django.contrib.staticfiles'))
+        self.assertFalse(apps.is_installed('django.contrib.webdesign'))
 
     @override_settings(INSTALLED_APPS=['apps.apps.RelabeledAppsConfig'])
     def test_relabeling(self):