from django.db import migrations

def populate_books(apps, schema_editor):
    BookEdition = apps.get_model('hadis', 'BookEdition')
    for edition in BookEdition.objects.filter(book_reference__isnull=False):
        edition.books.add(edition.book_reference)

def reverse_populate(apps, schema_editor):
    pass

class Migration(migrations.Migration):

    dependencies = [
        ('hadis', '0066_alter_bookreference_options_bookedition_books_and_more'),
    ]

    operations = [
        migrations.RunPython(populate_books, reverse_populate),
    ]