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), ), ]