from django.db import migrations, models def run_forward(apps, schema_editor): for config in apps.get_model('app', 'Config').objects.all(): config.name = f'Unnamed config ({config.created_at.date()})' config.save() class Migration(migrations.Migration): dependencies = [ ('app', '0005_user_force_pro'), ] operations = [ migrations.AddField( model_name='config', name='name', field=models.CharField(max_length=255, null=True), ), migrations.RunPython(run_forward, lambda _, __: None), migrations.AlterField( model_name='config', name='name', field=models.CharField(max_length=255), ), ]