# Migrations

OhMyAPI uses [Aerich](https://github.com/tortoise/aerich) - a database migrations tool for TortoiseORM.

## Making migrations

Whenever you add, remove or change fields of a database model, you need to create a migration for the change.

```
ohmyapi makemigrations [ <app> ]  # no app indicates all INSTALLED_APPS
```

This will create a `migrations/` directory with subdirectories for each of your apps.

## Migrating

When the migrations are create, they need to be applied:

```
ohmyapi migrate [ <app> ]  # no app indicates all INSTALLED_APPS
```