From 32e62374506827723423471a115e6b25313ed887 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Thu, 10 Apr 2014 08:45:48 -0400
Subject: [PATCH] [1.7.x] Fixed #22195 -- Used constants to define built-in
 tags for check framework.

Thanks Elvard for the patch.

Backport of b513fa5fc6 from master
---
 django/contrib/admin/apps.py                     |  2 +-
 django/contrib/auth/apps.py                      |  2 +-
 django/contrib/contenttypes/apps.py              |  2 +-
 django/core/checks/__init__.py                   |  4 ++--
 django/core/checks/compatibility/django_1_6_0.py |  4 ++--
 django/core/checks/model_checks.py               |  6 +++---
 django/core/checks/registry.py                   | 10 ++++++++++
 7 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/django/contrib/admin/apps.py b/django/contrib/admin/apps.py
index a1f4042998..3b4f1a3028 100644
--- a/django/contrib/admin/apps.py
+++ b/django/contrib/admin/apps.py
@@ -11,7 +11,7 @@ class SimpleAdminConfig(AppConfig):
     verbose_name = _("Administration")
 
     def ready(self):
-        checks.register('admin')(check_admin_app)
+        checks.register(checks.Tags.admin)(check_admin_app)
 
 
 class AdminConfig(SimpleAdminConfig):
diff --git a/django/contrib/auth/apps.py b/django/contrib/auth/apps.py
index f0e169c23c..254a73d3db 100644
--- a/django/contrib/auth/apps.py
+++ b/django/contrib/auth/apps.py
@@ -10,4 +10,4 @@ class AuthConfig(AppConfig):
     verbose_name = _("Authentication and Authorization")
 
     def ready(self):
-        checks.register('models')(check_user_model)
+        checks.register(checks.Tags.models)(check_user_model)
diff --git a/django/contrib/contenttypes/apps.py b/django/contrib/contenttypes/apps.py
index fbe4fccfa6..0462e3163c 100644
--- a/django/contrib/contenttypes/apps.py
+++ b/django/contrib/contenttypes/apps.py
@@ -9,4 +9,4 @@ class ContentTypesConfig(AppConfig):
     verbose_name = _("Content Types")
 
     def ready(self):
-        checks.register('models')(check_generic_foreign_keys)
+        checks.register(checks.Tags.models)(check_generic_foreign_keys)
diff --git a/django/core/checks/__init__.py b/django/core/checks/__init__.py
index 82a3acf337..cd4d5cebea 100644
--- a/django/core/checks/__init__.py
+++ b/django/core/checks/__init__.py
@@ -4,7 +4,7 @@ from __future__ import unicode_literals
 from .messages import (CheckMessage,
         Debug, Info, Warning, Error, Critical,
         DEBUG, INFO, WARNING, ERROR, CRITICAL)
-from .registry import register, run_checks, tag_exists
+from .registry import register, run_checks, tag_exists, Tags
 
 # Import these to force registration of checks
 import django.core.checks.compatibility.django_1_6_0  # NOQA
@@ -14,5 +14,5 @@ __all__ = [
     'CheckMessage',
     'Debug', 'Info', 'Warning', 'Error', 'Critical',
     'DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL',
-    'register', 'run_checks', 'tag_exists',
+    'register', 'run_checks', 'tag_exists', 'Tags',
 ]
diff --git a/django/core/checks/compatibility/django_1_6_0.py b/django/core/checks/compatibility/django_1_6_0.py
index 06fb113005..a805053aec 100644
--- a/django/core/checks/compatibility/django_1_6_0.py
+++ b/django/core/checks/compatibility/django_1_6_0.py
@@ -3,10 +3,10 @@ from __future__ import unicode_literals
 
 from django.apps import apps
 
-from .. import Warning, register
+from .. import Warning, register, Tags
 
 
-@register('compatibility')
+@register(Tags.compatibility)
 def check_1_6_compatibility(**kwargs):
     errors = []
     errors.extend(_check_test_runner(**kwargs))
diff --git a/django/core/checks/model_checks.py b/django/core/checks/model_checks.py
index 46e5c6ff94..3f5a36b41b 100644
--- a/django/core/checks/model_checks.py
+++ b/django/core/checks/model_checks.py
@@ -6,10 +6,10 @@ import types
 
 from django.apps import apps
 
-from . import Error, register
+from . import Error, Tags, register
 
 
-@register('models')
+@register(Tags.models)
 def check_all_models(app_configs=None, **kwargs):
     errors = [model.check(**kwargs)
         for model in apps.get_models()
@@ -17,7 +17,7 @@ def check_all_models(app_configs=None, **kwargs):
     return list(chain(*errors))
 
 
-@register('models', 'signals')
+@register(Tags.models, Tags.signals)
 def check_model_signals(app_configs=None, **kwargs):
     """Ensure lazily referenced model signals senders are installed."""
     from django.db import models
diff --git a/django/core/checks/registry.py b/django/core/checks/registry.py
index 21efbf317e..e88e0b8c37 100644
--- a/django/core/checks/registry.py
+++ b/django/core/checks/registry.py
@@ -6,6 +6,16 @@ from itertools import chain
 from django.utils.itercompat import is_iterable
 
 
+class Tags(object):
+    """
+    Built-in tags for internal checks.
+    """
+    admin = 'admin'
+    compatibility = 'compatibility'
+    models = 'models'
+    signals = 'signals'
+
+
 class CheckRegistry(object):
 
     def __init__(self):