moviewyrm/bookwyrm/migrations/0008_work_default_edition.py

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# Generated by Django 3.0.7 on 2020-11-04 18:15
from django.db import migrations, models
import django.db.models.deletion
def set_default_edition(app_registry, schema_editor):
db_alias = schema_editor.connection.alias
works = app_registry.get_model('bookwyrm', 'Work').objects.using(db_alias)
editions = app_registry.get_model('bookwyrm', 'Edition').objects.using(db_alias)
for work in works:
ed = editions.filter(parent_work=work, default=True).first()
if not ed:
ed = editions.filter(parent_work=work).first()
work.default_edition = ed
work.save()
class Migration(migrations.Migration):
dependencies = [
('bookwyrm', '0007_auto_20201103_0014'),
]
operations = [
migrations.AddField(
model_name='work',
name='default_edition',
field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='bookwyrm.Edition'),
),
migrations.RunPython(set_default_edition),
migrations.RemoveField(
model_name='edition',
name='default',
),
]