Fixed #21477 -- Renamed db to using in pre/post_migrate signals.

django/contrib/auth/management/__init__.py

@@ -60,7 +60,7 @@ def _check_permission_clashing(custom, builtin, ctype):
         pool.add(codename)
 
 
-def create_permissions(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
+def create_permissions(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
     if not app_config.models_module:
         return
 
@@ -69,7 +69,7 @@ def create_permissions(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_
     except LookupError:
         return
 
-    if not router.allow_migrate(db, Permission):
+    if not router.allow_migrate(using, Permission):
         return
 
     from django.contrib.contenttypes.models import ContentType
@@ -82,7 +82,7 @@ def create_permissions(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_
     for klass in app_config.get_models():
         # Force looking up the content types in the current database
         # before creating foreign keys to them.
-        ctype = ContentType.objects.db_manager(db).get_for_model(klass)
+        ctype = ContentType.objects.db_manager(using).get_for_model(klass)
         ctypes.add(ctype)
         for perm in _get_all_permissions(klass._meta, ctype):
             searched_perms.append((ctype, perm))
@@ -90,7 +90,7 @@ def create_permissions(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_
     # Find all the Permissions that have a content_type for a model we're
     # looking for.  We don't need to check for codenames since we already have
     # a list of the ones we're going to create.
-    all_perms = set(Permission.objects.using(db).filter(
+    all_perms = set(Permission.objects.using(using).filter(
         content_type__in=ctypes,
     ).values_list(
         "content_type", "codename"
@@ -113,13 +113,13 @@ def create_permissions(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_
                     verbose_name_max_length,
                 )
             )
-    Permission.objects.using(db).bulk_create(perms)
+    Permission.objects.using(using).bulk_create(perms)
     if verbosity >= 2:
         for perm in perms:
             print("Adding permission '%s'" % perm)
 
 
-def create_superuser(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
+def create_superuser(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
     try:
         apps.get_model('auth', 'Permission')
     except LookupError:
@@ -139,7 +139,7 @@ def create_superuser(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_AL
                 confirm = input('Please enter either "yes" or "no": ')
                 continue
             if confirm == 'yes':
-                call_command("createsuperuser", interactive=True, database=db)
+                call_command("createsuperuser", interactive=True, database=using)
             break
 
 

django/contrib/contenttypes/management.py

@@ -6,7 +6,7 @@ from django.utils import six
 from django.utils.six.moves import input
 
 
-def update_contenttypes(app_config, verbosity=2, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
+def update_contenttypes(app_config, verbosity=2, interactive=True, using=DEFAULT_DB_ALIAS, **kwargs):
     """
     Creates content types for models in the given app, removing any model
     entries that no longer have a matching model class.
@@ -19,7 +19,7 @@ def update_contenttypes(app_config, verbosity=2, interactive=True, db=DEFAULT_DB
     except LookupError:
         return
 
-    if not router.allow_migrate(db, ContentType):
+    if not router.allow_migrate(using, ContentType):
         return
 
     ContentType.objects.clear_cache()
@@ -36,7 +36,7 @@ def update_contenttypes(app_config, verbosity=2, interactive=True, db=DEFAULT_DB
     # Get all the content types
     content_types = dict(
         (ct.model, ct)
-        for ct in ContentType.objects.using(db).filter(app_label=app_label)
+        for ct in ContentType.objects.using(using).filter(app_label=app_label)
     )
     to_remove = [
         ct
@@ -53,7 +53,7 @@ def update_contenttypes(app_config, verbosity=2, interactive=True, db=DEFAULT_DB
         for (model_name, model) in six.iteritems(app_models)
         if model_name not in content_types
     ]
-    ContentType.objects.using(db).bulk_create(cts)
+    ContentType.objects.using(using).bulk_create(cts)
     if verbosity >= 2:
         for ct in cts:
             print("Adding content type '%s | %s'" % (ct.app_label, ct.model))

django/core/management/sql.py

@@ -217,7 +217,7 @@ def emit_pre_migrate_signal(create_models, verbosity, interactive, db):
             app_config=app_config,
             verbosity=verbosity,
             interactive=interactive,
-            db=db)
+            using=db)
         # For backwards-compatibility -- remove in Django 1.9.
         models.signals.pre_syncdb.send(
             sender=app_config.models_module,
@@ -240,7 +240,7 @@ def emit_post_migrate_signal(created_models, verbosity, interactive, db):
             app_config=app_config,
             verbosity=verbosity,
             interactive=interactive,
-            db=db)
+            using=db)
         # For backwards-compatibility -- remove in Django 1.9.
         models.signals.post_syncdb.send(
             sender=app_config.models_module,

django/db/models/signals.py

@@ -62,8 +62,8 @@ post_delete = ModelSignal(providing_args=["instance", "using"], use_caching=True
 
 m2m_changed = ModelSignal(providing_args=["action", "instance", "reverse", "model", "pk_set", "using"], use_caching=True)
 
-pre_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "db"])
-post_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "db"])
+pre_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using"])
+post_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "using"])
 
 pre_syncdb = Signal(providing_args=["app", "create_models", "verbosity", "interactive", "db"])
 post_syncdb = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive", "db"])

docs/ref/signals.txt

@@ -408,7 +408,7 @@ Arguments sent with this signal:
     For example, the :mod:`django.contrib.auth` app only prompts to create a
     superuser when ``interactive`` is ``True``.
 
-``db``
+``using``
     The alias of database on which a command will operate.
 
 pre_syncdb
@@ -459,7 +459,7 @@ Arguments sent with this signal:
     For example, the :mod:`django.contrib.auth` app only prompts to create a
     superuser when ``interactive`` is ``True``.
 
-``db``
+``using``
     The alias of database on which a command will operate.
 
 post_migrate

tests/migrate_signals/tests.py

@@ -6,7 +6,7 @@ from django.utils import six
 
 
 APP_CONFIG = apps.get_app_config('migrate_signals')
-PRE_MIGRATE_ARGS = ['app_config', 'verbosity', 'interactive', 'db']
+PRE_MIGRATE_ARGS = ['app_config', 'verbosity', 'interactive', 'using']
 MIGRATE_DATABASE = 'default'
 MIGRATE_VERBOSITY = 1
 MIGRATE_INTERACTIVE = False
@@ -35,7 +35,7 @@ class OneTimeReceiver(object):
     def __call__(self, signal, sender, **kwargs):
         # Although test runner calls migrate for several databases,
         # testing for only one of them is quite sufficient.
-        if kwargs['db'] == MIGRATE_DATABASE:
+        if kwargs['using'] == MIGRATE_DATABASE:
             self.call_counter = self.call_counter + 1
             self.call_args = kwargs
             # we need to test only one call of migrate
@@ -74,4 +74,4 @@ class MigrateSignalTests(TestCase):
         self.assertEqual(args['app_config'], APP_CONFIG)
         self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
         self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
-        self.assertEqual(args['db'], 'default')
+        self.assertEqual(args['using'], 'default')