Fixed #23750 -- Allowed core.checks.register to be used as a function

4 files changed, 15 insertions, 8 deletions

diff --git a/django/contrib/admin/apps.py b/django/contrib/admin/apps.py
index 3b4f1a3028..b052746ff4 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(checks.Tags.admin)(check_admin_app)
+        checks.register(check_admin_app, checks.Tags.admin)
 
 
 class AdminConfig(SimpleAdminConfig):
diff --git a/django/contrib/auth/apps.py b/django/contrib/auth/apps.py
index 254a73d3db..3a0cb1aea1 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(checks.Tags.models)(check_user_model)
+        checks.register(check_user_model, checks.Tags.models)
diff --git a/django/contrib/contenttypes/apps.py b/django/contrib/contenttypes/apps.py
index 0462e3163c..6fc8633762 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(checks.Tags.models)(check_generic_foreign_keys)
+        checks.register(check_generic_foreign_keys, checks.Tags.models)
diff --git a/django/core/checks/registry.py b/django/core/checks/registry.py
index e8626f03c7..88cc519a50 100644
--- a/django/core/checks/registry.py
+++ b/django/core/checks/registry.py
@@ -23,11 +23,11 @@ class CheckRegistry(object):
         self.registered_checks = []
         self.deployment_checks = []
 
-    def register(self, *tags, **kwargs):
+    def register(self, check=None, *tags, **kwargs):
         """
-        Decorator. Register given function `f` labeled with given `tags`. The
-        function should receive **kwargs and return list of Errors and
-        Warnings.
+        Can be used as a function or a decorator. Register given function
+        `f` labeled with given `tags`. The function should receive **kwargs
+        and return list of Errors and Warnings.
 
         Example::
 
@@ -36,6 +36,8 @@ class CheckRegistry(object):
             def my_check(apps, **kwargs):
                 # ... perform checks and collect `errors` ...
                 return errors
+            # or
+            registry.register(my_check, 'mytag', 'anothertag')
 
         """
         kwargs.setdefault('deploy', False)
@@ -49,7 +51,12 @@ class CheckRegistry(object):
                 self.registered_checks.append(check)
             return check
 
-        return inner
+        if callable(check):
+            return inner(check)
+        else:
+            if check:
+                tags += (check, )
+            return inner
 
     def run_checks(self, app_configs=None, tags=None, include_deployment_checks=False):
         """ Run all registered checks and return list of Errors and Warnings.