0002_author_migrations.py

from django.db import migrations

from main_app.models import Book


def change_author(apps, schema_editor):
    Book.objects \
        .filter(authors__first_name=['Аркадий', 'Борис'], authors__last_name=['Стругацкий']) \
        .update('Суахили')


class Migration(migrations.Migration):
    dependencies = [
        ('main_app', '...prepend_migrations...'),
    ]

    operations = [
        migrations.RunPython(change_author, reverse_code=migrations.RunPython.noop),
    ]