Produits Entr'ouvert » django-mellon

# Generated by Django 2.2.19 on 2021-09-14 18:54

from django.db import migrations

from django.db.models import Count

def migrate_issuer_forward(apps, schema_editor):

    UserSAMLIdentifier = apps.get_model('mellon', 'UserSAMLIdentifier')

    Issuer = apps.get_model('mellon', 'Issuer')

    issuers = UserSAMLIdentifier.objects.values_list('issuer').annotate(total=Count('id'))

    for issuer, total in issuers:

        issuer_instance = Issuer.objects.create(entity_id=issuer)

        UserSAMLIdentifier.objects.filter(issuer=issuer).update(issuer_fk=issuer_instance)

def migrate_issuer_backward(apps, schema_editor):

    UserSAMLIdentifier = apps.get_model('mellon', 'UserSAMLIdentifier')

    Issuer = apps.get_model('mellon', 'Issuer')

    for issuer in Issuer.objects.all():

        UserSAMLIdentifier.objects.filter(issuer_fk=issuer).update(isuer=issuer.entity_id)

class Migration(migrations.Migration):

    dependencies = [

        ('mellon', '0003_add_issuer_model'),

    ]

    operations = []

    operations = [

        migrations.RunPython(migrate_issuer_forward, migrate_issuer_backward),

    ]

from django.core.management import call_command

from django.db import connection

from django.db.migrations.executor import MigrationExecutor

@pytest.fixture()

def migration(request, transactional_db):

    # see https://gist.github.com/asfaltboy/b3e6f9b5d95af8ba2cc46f2ba6eae5e2

    """

    This fixture returns a helper object to test Django data migrations.

    The fixture returns an object with two methods;

     - `before` to initialize db to the state before the migration under test

     - `after` to execute the migration and bring db to the state after the migration

    The methods return `old_apps` and `new_apps` respectively; these can

    be used to initiate the ORM models as in the migrations themselves.

    For example:

        def test_foo_set_to_bar(migration):

            old_apps = migration.before([('my_app', '0001_inital')])

            Foo = old_apps.get_model('my_app', 'foo')

            Foo.objects.create(bar=False)

            assert Foo.objects.count() == 1

            assert Foo.objects.filter(bar=False).count() == Foo.objects.count()

            # executing migration

            new_apps = migration.apply([('my_app', '0002_set_foo_bar')])

            Foo = new_apps.get_model('my_app', 'foo')

            assert Foo.objects.filter(bar=False).count() == 0

            assert Foo.objects.filter(bar=True).count() == Foo.objects.count()

    Based on: https://gist.github.com/blueyed/4fb0a807104551f103e6

    """

    class Migrator:

        def before(self, targets, at_end=True):

            """Specify app and starting migration names as in:

            before([('app', '0001_before')]) => app/migrations/0001_before.py

            """

            executor = MigrationExecutor(connection)

            executor.migrate(targets)

            executor.loader.build_graph()

            return executor._create_project_state(with_applied_migrations=True).apps

        def apply(self, targets):

            """Migrate forwards to the "targets" migration"""

            executor = MigrationExecutor(connection)

            executor.migrate(targets)

            executor.loader.build_graph()

            return executor._create_project_state(with_applied_migrations=True).apps

    yield Migrator()

    call_command('migrate', verbosity=0)