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

AUTHORS

@@ -561,6 +561,7 @@ answer newbie questions, and generally made Django that much better:
     Raúl Cumplido <raulcumplido@gmail.com>
     Remco Wendt <remco.wendt@gmail.com>
     Renaud Parent <renaud.parent@gmail.com>
+    Renbi Yu <averybigant@gmail.com>
     Reza Mohammadi <reza@zeerak.ir>
     rhettg@gmail.com
     Ricardo Javier Cárdenes Medina <ricardo.cardenes@gmail.com>

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):

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)

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)

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)
@@ -49,6 +51,11 @@ class CheckRegistry(object):
                 self.registered_checks.append(check)
             return check
 
+        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):

docs/releases/1.8.txt

@@ -364,6 +364,11 @@ Signals
   the request, was added to the :data:`~django.core.signals.request_started`
   signal.
 
+System Check Framework
+^^^^^^^^^^^^^^^^^^^^^^
+
+* :attr:`~django.core.checks.register` can now be used as a function.
+
 Templates
 ^^^^^^^^^
 

docs/topics/checks.txt

@@ -151,6 +151,20 @@ settings file like this::
 These checks will only be run if the :djadminopt:`--deploy` option is passed to
 the :djadmin:`check` command.
 
+You can also use ``register`` as a function rather than a decorator by
+passing a callable object (usually a function) as the first argument
+to ``register``.
+
+The code below is equivalent to the code above::
+
+    def my_check(app_configs, **kwargs):
+        ...
+    register(my_check, Tags.security, deploy=True)
+
+.. versionchanged:: 1.8
+
+    The ability to use register as a function was added.
+
 .. _field-checking:
 
 Field, Model, and Manager checks

tests/check_framework/tests.py

@@ -31,17 +31,47 @@ class DummyObj(object):
 class SystemCheckFrameworkTests(TestCase):
 
     def test_register_and_run_checks(self):
-        calls = [0]
 
-        registry = CheckRegistry()
-
-        @registry.register()
         def f(**kwargs):
             calls[0] += 1
             return [1, 2, 3]
+
+        def f2(**kwargs):
+            return [4, ]
+
+        def f3(**kwargs):
+            return [5, ]
+
+        calls = [0]
+
+        # test register as decorator
+        registry = CheckRegistry()
+        registry.register()(f)
+        registry.register("tag1", "tag2")(f2)
+        registry.register("tag2", deploy=True)(f3)
+
+        # test register as function
+        registry2 = CheckRegistry()
+        registry2.register(f)
+        registry2.register(f2, "tag1", "tag2")
+        registry2.register(f3, "tag2", deploy=True)
+
+        # check results
         errors = registry.run_checks()
-        self.assertEqual(errors, [1, 2, 3])
-        self.assertEqual(calls[0], 1)
+        errors2 = registry2.run_checks()
+        self.assertEqual(errors, errors2)
+        self.assertEqual(sorted(errors), [1, 2, 3, 4])
+        self.assertEqual(calls[0], 2)
+
+        errors = registry.run_checks(tags=["tag1"])
+        errors2 = registry2.run_checks(tags=["tag1"])
+        self.assertEqual(errors, errors2)
+        self.assertEqual(sorted(errors), [4])
+
+        errors = registry.run_checks(tags=["tag1", "tag2"], include_deployment_checks=True)
+        errors2 = registry2.run_checks(tags=["tag1", "tag2"], include_deployment_checks=True)
+        self.assertEqual(errors, errors2)
+        self.assertEqual(sorted(errors), [4, 5])
 
 
 class MessageTests(TestCase):