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Refactored the migration signals to use app configs. 

De-aliased pre/post_syncdb to pre/post_migrate to increase
backwards-compatibility.
This commit is contained in:
Aymeric Augustin 2013-12-27 20:55:58 +01:00
parent 5782c94f23
commit 00110904ac
11 changed files with 187 additions and 76 deletions
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27
django/contrib/auth/management/__init__.py
View File

@ -60,18 +60,21 @@ def _check_permission_clashing(custom, builtin, ctype):
pool.add(codename)
def create_permissions(app, created_models, verbosity, db=DEFAULT_DB_ALIAS, **kwargs):
def create_permissions(app_config, verbosity=22, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
if not app_config.models_module:
return
try:
apps.get_model('auth', 'Permission')
Permission = apps.get_model('auth', 'Permission')
except LookupError:
return
if not router.allow_migrate(db, auth_app.Permission):
if not router.allow_migrate(db, Permission):
return
from django.contrib.contenttypes.models import ContentType
app_models = apps.get_models(app)
app_models = apps.get_models(app_config.models_module)
# This will hold the permissions we're looking for as
# (content_type, (codename, name))
@ -89,20 +92,20 @@ def create_permissions(app, created_models, verbosity, db=DEFAULT_DB_ALIAS, **kw
# 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(auth_app.Permission.objects.using(db).filter(
all_perms = set(Permission.objects.using(db).filter(
content_type__in=ctypes,
).values_list(
"content_type", "codename"
))
perms = [
auth_app.Permission(codename=codename, name=name, content_type=ctype)
Permission(codename=codename, name=name, content_type=ctype)
for ctype, (codename, name) in searched_perms
if (ctype.pk, codename) not in all_perms
]
# Validate the permissions before bulk_creation to avoid cryptic
# database error when the verbose_name is longer than 50 characters
permission_name_max_length = auth_app.Permission._meta.get_field('name').max_length
permission_name_max_length = Permission._meta.get_field('name').max_length
verbose_name_max_length = permission_name_max_length - 11 # len('Can change ') prefix
for perm in perms:
if len(perm.name) > permission_name_max_length:
@ -112,13 +115,13 @@ def create_permissions(app, created_models, verbosity, db=DEFAULT_DB_ALIAS, **kw
verbose_name_max_length,
)
)
auth_app.Permission.objects.using(db).bulk_create(perms)
Permission.objects.using(db).bulk_create(perms)
if verbosity >= 2:
for perm in perms:
print("Adding permission '%s'" % perm)
def create_superuser(app, created_models, verbosity, db, **kwargs):
def create_superuser(app_config, verbosity=22, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
try:
apps.get_model('auth', 'Permission')
except LookupError:
@ -128,7 +131,7 @@ def create_superuser(app, created_models, verbosity, db, **kwargs):
from django.core.management import call_command
if UserModel in created_models and kwargs.get('interactive', True):
if not UserModel.objects.exists() and interactive:
msg = ("\nYou just installed Django's auth system, which means you "
"don't have any superusers defined.\nWould you like to create one "
"now? (yes/no): ")
@ -203,7 +206,9 @@ def get_default_username(check_db=True):
return ''
return default_username
signals.post_migrate.connect(create_permissions,
dispatch_uid="django.contrib.auth.management.create_permissions")
signals.post_migrate.connect(create_superuser,
sender=auth_app, dispatch_uid="django.contrib.auth.management.create_superuser")
sender=apps.get_app_config('auth'),
dispatch_uid="django.contrib.auth.management.create_superuser")

18
django/contrib/auth/tests/test_management.py
View File

@ -232,13 +232,15 @@ class PermissionTestCase(TestCase):
Test that we show proper error message if we are trying to create
duplicate permissions.
"""
auth_app_config = apps.get_app_config('auth')
# check duplicated default permission
models.Permission._meta.permissions = [
('change_permission', 'Can edit permission (duplicate)')]
six.assertRaisesRegex(self, CommandError,
"The permission codename 'change_permission' clashes with a "
"builtin permission for model 'auth.Permission'.",
create_permissions, models, [], verbosity=0)
create_permissions, auth_app_config, verbosity=0)
# check duplicated custom permissions
models.Permission._meta.permissions = [
@ -249,21 +251,23 @@ class PermissionTestCase(TestCase):
six.assertRaisesRegex(self, CommandError,
"The permission codename 'my_custom_permission' is duplicated for model "
"'auth.Permission'.",
create_permissions, models, [], verbosity=0)
create_permissions, auth_app_config, verbosity=0)
# should not raise anything
models.Permission._meta.permissions = [
('my_custom_permission', 'Some permission'),
('other_one', 'Some other permission'),
]
create_permissions(models, [], verbosity=0)
create_permissions(auth_app_config, verbosity=0)
def test_default_permissions(self):
auth_app_config = apps.get_app_config('auth')
permission_content_type = ContentType.objects.get_by_natural_key('auth', 'permission')
models.Permission._meta.permissions = [
('my_custom_permission', 'Some permission'),
]
create_permissions(models, [], verbosity=0)
create_permissions(auth_app_config, verbosity=0)
# add/change/delete permission by default + custom permission
self.assertEqual(models.Permission.objects.filter(
@ -272,7 +276,7 @@ class PermissionTestCase(TestCase):
models.Permission.objects.filter(content_type=permission_content_type).delete()
models.Permission._meta.default_permissions = []
create_permissions(models, [], verbosity=0)
create_permissions(auth_app_config, verbosity=0)
# custom permission only since default permissions is empty
self.assertEqual(models.Permission.objects.filter(
@ -280,10 +284,12 @@ class PermissionTestCase(TestCase):
).count(), 1)
def test_verbose_name_length(self):
auth_app_config = apps.get_app_config('auth')
permission_content_type = ContentType.objects.get_by_natural_key('auth', 'permission')
models.Permission.objects.filter(content_type=permission_content_type).delete()
models.Permission._meta.verbose_name = "some ridiculously long verbose name that is out of control"
six.assertRaisesRegex(self, exceptions.ValidationError,
"The verbose_name of permission is longer than 39 characters",
create_permissions, models, [], verbosity=0)
create_permissions, auth_app_config, verbosity=0)

16
django/contrib/contenttypes/management.py
View File

@ -1,5 +1,4 @@
from django.apps import apps
from django.contrib.contenttypes.models import ContentType
from django.db import DEFAULT_DB_ALIAS, router
from django.db.models import signals
from django.utils.encoding import smart_text
@ -7,13 +6,16 @@ from django.utils import six
from django.utils.six.moves import input
def update_contenttypes(app, created_models, verbosity=2, db=DEFAULT_DB_ALIAS, **kwargs):
def update_contenttypes(app_config, verbosity=2, interactive=True, db=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.
"""
if not app_config.models_module:
return
try:
apps.get_model('contenttypes', 'ContentType')
ContentType = apps.get_model('contenttypes', 'ContentType')
except LookupError:
return
@ -21,7 +23,7 @@ def update_contenttypes(app, created_models, verbosity=2, db=DEFAULT_DB_ALIAS, *
return
ContentType.objects.clear_cache()
app_models = apps.get_models(app)
app_models = apps.get_models(app_config.models_module)
if not app_models:
return
# They all have the same app_label, get the first one.
@ -85,11 +87,13 @@ If you're unsure, answer 'no'.
print("Stale content types remain.")
def update_all_contenttypes(verbosity=2, **kwargs):
def update_all_contenttypes(**kwargs):
for app_config in apps.get_app_configs(only_with_models_module=True):
update_contenttypes(app_config.models_module, None, verbosity, **kwargs)
update_contenttypes(app_config, **kwargs)
signals.post_migrate.connect(update_contenttypes)
if __name__ == "__main__":
update_all_contenttypes()

26
django/contrib/sites/management.py
View File

@ -2,17 +2,22 @@
Creates the default Site object.
"""
from django.db.models import signals
from django.db import connections
from django.db import router
from django.contrib.sites.models import Site
from django.contrib.sites import models as site_app
from django.apps import apps
from django.core.management.color import no_style
from django.db import DEFAULT_DB_ALIAS, connections, router
from django.db.models import signals
def create_default_site(app, created_models, verbosity, db, **kwargs):
# Only create the default sites in databases where Django created the table
if Site in created_models and router.allow_migrate(db, Site):
def create_default_site(app_config, verbosity=22, interactive=True, db=DEFAULT_DB_ALIAS, **kwargs):
try:
Site = apps.get_model('sites', 'Site')
except LookupError:
return
if not router.allow_migrate(db, Site):
return
if not Site.objects.exists():
# The default settings set SITE_ID = 1, and some tests in Django's test
# suite rely on this value. However, if database sequences are reused
# (e.g. in the test suite after flush/syncdb), it isn't guaranteed that
@ -32,6 +37,7 @@ def create_default_site(app, created_models, verbosity, db, **kwargs):
for command in sequence_sql:
cursor.execute(command)
Site.objects.clear_cache()
Site.objects.clear_cache()
signals.post_migrate.connect(create_default_site, sender=site_app)
signals.post_migrate.connect(create_default_site, sender=apps.get_app_config('sites'))

14
django/core/management/sql.py
View File

@ -211,6 +211,13 @@ def emit_pre_migrate_signal(create_models, verbosity, interactive, db):
if verbosity >= 2:
print("Running pre-migrate handlers for application %s" % app_config.label)
models.signals.pre_migrate.send(
sender=app_config,
app_config=app_config,
verbosity=verbosity,
interactive=interactive,
db=db)
# For backwards-compatibility -- remove in Django 1.9.
models.signals.pre_syncdb.send(
sender=app_config.models_module,
app=app_config.models_module,
create_models=create_models,
@ -225,6 +232,13 @@ def emit_post_migrate_signal(created_models, verbosity, interactive, db):
if verbosity >= 2:
print("Running post-migrate handlers for application %s" % app_config.label)
models.signals.post_migrate.send(
sender=app_config,
app_config=app_config,
verbosity=verbosity,
interactive=interactive,
db=db)
# For backwards-compatibility -- remove in Django 1.9.
models.signals.post_syncdb.send(
sender=app_config.models_module,
app=app_config.models_module,
created_models=created_models,

9
django/db/models/signals.py
View File

@ -62,7 +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", "create_models", "verbosity", "interactive", "db"])
pre_syncdb = pre_migrate
post_migrate = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive", "db"])
post_syncdb = post_migrate
pre_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "db"])
post_migrate = Signal(providing_args=["app_config", "verbosity", "interactive", "db"])
pre_syncdb = Signal(providing_args=["app", "create_models", "verbosity", "interactive", "db"])
post_syncdb = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive", "db"])

5
docs/internals/deprecation.txt
View File

@ -165,10 +165,7 @@ these changes.
* The ``syncdb`` command will be removed.
* ``django.db.models.signals.pre_syncdb`` and
``django.db.models.signals.post_syncdb`` will be removed, and
``django.db.models.signals.pre_migrate`` and
``django.db.models.signals.post_migrate`` will lose their
``create_models`` and ``created_models`` arguments.
``django.db.models.signals.post_syncdb`` will be removed.
* ``allow_syncdb`` on database routers will no longer automatically become
``allow_migrate``.

117
docs/ref/signals.txt
View File

@ -381,12 +381,10 @@ handlers are registered anywhere else they may not be loaded by
Arguments sent with this signal:
``sender``
The ``models`` module of the app about to be migrated/synced.
For example, if :djadmin:`migrate` is about to install
an app called ``"foo.bar.myapp"``, ``sender`` will be the
``foo.bar.myapp.models`` module.
An :class:`~django.apps.AppConfig` instance for the application about to
be migrated/synced.
``app``
``app_config``
Same as ``sender``.
``verbosity``
@ -415,14 +413,48 @@ pre_syncdb
.. deprecated:: 1.7
This signal has been renamed to :data:`~django.db.models.signals.pre_migrate`.
This signal has been replaced by :data:`~django.db.models.signals.pre_migrate`.
Alias of :data:`django.db.models.signals.pre_migrate`. As long as this alias
is present, for backwards-compatibility this signal has an extra argument it sends:
Sent by the :djadmin:`syncdb` command before it starts to install an
application.
Any handlers that listen to this signal need to be written in a particular
place: a ``management`` module in one of your :setting:`INSTALLED_APPS`. If
handlers are registered anywhere else they may not be loaded by
:djadmin:`syncdb`.
Arguments sent with this signal:
``sender``
The ``models`` module that was just installed. That is, if
:djadmin:`syncdb` just installed an app called ``"foo.bar.myapp"``,
``sender`` will be the ``foo.bar.myapp.models`` module.
``app``
Same as ``sender``.
``create_models``
A list of the model classes from any app which :djadmin:`migrate` is
going to create, **only if the app has no migrations**.
A list of the model classes from any app which :djadmin:`syncdb` plans to
create.
``verbosity``
Indicates how much information manage.py is printing on screen. See
the :djadminopt:`--verbosity` flag for details.
Functions which listen for :data:`pre_syncdb` should adjust what they
output to the screen based on the value of this argument.
``interactive``
If ``interactive`` is ``True``, it's safe to prompt the user to input
things on the command line. If ``interactive`` is ``False``, functions
which listen for this signal should not try to prompt for anything.
For example, the :mod:`django.contrib.auth` app only prompts to create a
superuser when ``interactive`` is ``True``.
``db``
The alias of database on which a command will operate.
post_migrate
------------
@ -444,11 +476,10 @@ idempotent changes (e.g. no database alterations) as this may cause the
Arguments sent with this signal:
``sender``
The ``models`` module that was just installed. That is, if
:djadmin:`migrate` just installed an app called ``"foo.bar.myapp"``,
``sender`` will be the ``foo.bar.myapp.models`` module.
An :class:`~django.apps.AppConfig` instance for the application that was
just installed.
``app``
``app_config``
Same as ``sender``.
``verbosity``
@ -489,14 +520,62 @@ post_syncdb
.. deprecated:: 1.7
This signal has been renamed to :data:`~django.db.models.signals.post_migrate`.
This signal has been replaced by :data:`~django.db.models.signals.post_migrate`.
Alias of :data:`django.db.models.signals.post_migrate`. As long as this alias
is present, for backwards-compatibility this signal has an extra argument it sends:
Sent by the :djadmin:`syncdb` command after it installs an application, and the
:djadmin:`flush` command.
Any handlers that listen to this signal need to be written in a particular
place: a ``management`` module in one of your :setting:`INSTALLED_APPS`. If
handlers are registered anywhere else they may not be loaded by
:djadmin:`syncdb`. It is important that handlers of this signal perform
idempotent changes (e.g. no database alterations) as this may cause the
:djadmin:`flush` management command to fail if it also ran during the
:djadmin:`syncdb` command.
Arguments sent with this signal:
``sender``
The ``models`` module that was just installed. That is, if
:djadmin:`syncdb` just installed an app called ``"foo.bar.myapp"``,
``sender`` will be the ``foo.bar.myapp.models`` module.
``app``
Same as ``sender``.
``created_models``
A list of the model classes from any app which :djadmin:`migrate` has
created, **only if the app has no migrations**.
A list of the model classes from any app which :djadmin:`syncdb` has
created so far.
``verbosity``
Indicates how much information manage.py is printing on screen. See
the :djadminopt:`--verbosity` flag for details.
Functions which listen for :data:`post_syncdb` should adjust what they
output to the screen based on the value of this argument.
``interactive``
If ``interactive`` is ``True``, it's safe to prompt the user to input
things on the command line. If ``interactive`` is ``False``, functions
which listen for this signal should not try to prompt for anything.
For example, the :mod:`django.contrib.auth` app only prompts to create a
superuser when ``interactive`` is ``True``.
``db``
The database alias used for synchronization. Defaults to the ``default``
database.
For example, ``yourapp/management/__init__.py`` could be written like::
from django.db.models.signals import post_syncdb
import yourapp.models
def my_callback(sender, **kwargs):
# Your specific logic here
pass
post_syncdb.connect(my_callback, sender=yourapp.models)
Request/response signals
========================

9
docs/releases/1.7.txt
View File

@ -47,11 +47,12 @@ but a few of the key features are:
* A new ``makemigrations`` command provides an easy way to autodetect changes
to your models and make migrations for them.
* :data:`~django.db.models.signals.pre_syncdb` and
:data:`~django.db.models.signals.post_syncdb` have been renamed to
:data:`~django.db.models.signals.pre_syncdb` and
:data:`~django.db.models.signals.post_syncdb` have been replaced by
:data:`~django.db.models.signals.pre_migrate` and
:data:`~django.db.models.signals.post_migrate` respectively. The
``create_models``/``created_models`` argument has also been deprecated.
:data:`~django.db.models.signals.post_migrate` respectively. These new
signals have slightly different arguments. Check the documentation for
details.
* The ``allow_syncdb`` method on database routers is now called ``allow_migrate``,
but still performs the same function. Routers with ``allow_syncdb`` methods

4
tests/migrate_signals/models.py
View File

@ -1,2 +1,2 @@
# Remove this module when pre/post_migrate are refactored to use something
# other than a models module for their "sender" argument.
# This module has to exist, otherwise pre/post_migrate aren't sent for the
# migrate_signals application.

18
tests/migrate_signals/tests.py
View File

@ -1,12 +1,12 @@
from django.apps import apps
from django.db.models import signals
from django.test import TestCase
from django.core import management
from django.utils import six
from . import models
PRE_MIGRATE_ARGS = ['app', 'create_models', 'verbosity', 'interactive', 'db']
APP_CONFIG = apps.get_app_config('migrate_signals')
PRE_MIGRATE_ARGS = ['app_config', 'verbosity', 'interactive', 'db']
MIGRATE_DATABASE = 'default'
MIGRATE_VERBOSITY = 1
MIGRATE_INTERACTIVE = False
@ -39,7 +39,7 @@ class OneTimeReceiver(object):
self.call_counter = self.call_counter + 1
self.call_args = kwargs
# we need to test only one call of migrate
signals.pre_migrate.disconnect(pre_migrate_receiver, sender=models)
signals.pre_migrate.disconnect(pre_migrate_receiver, sender=APP_CONFIG)
# We connect receiver here and not in unit test code because we need to
@ -51,21 +51,19 @@ class OneTimeReceiver(object):
# 3. Test runner calls migrate for create default database.
# 4. Test runner execute our unit test code.
pre_migrate_receiver = OneTimeReceiver()
signals.pre_migrate.connect(pre_migrate_receiver, sender=models)
signals.pre_migrate.connect(pre_migrate_receiver, sender=APP_CONFIG)
class MigrateSignalTests(TestCase):
available_apps = [
'migrate_signals',
]
available_apps = ['migrate_signals']
def test_pre_migrate_call_time(self):
self.assertEqual(pre_migrate_receiver.call_counter, 1)
def test_pre_migrate_args(self):
r = PreMigrateReceiver()
signals.pre_migrate.connect(r, sender=models)
signals.pre_migrate.connect(r, sender=APP_CONFIG)
management.call_command('migrate', database=MIGRATE_DATABASE,
verbosity=MIGRATE_VERBOSITY, interactive=MIGRATE_INTERACTIVE,
load_initial_data=False, stdout=six.StringIO())
@ -73,7 +71,7 @@ class MigrateSignalTests(TestCase):
args = r.call_args
self.assertEqual(r.call_counter, 1)
self.assertEqual(set(args), set(PRE_MIGRATE_ARGS))
self.assertEqual(args['app'], models)
self.assertEqual(args['app_config'], APP_CONFIG)
self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
self.assertEqual(args['db'], 'default')