# Aerich
[](https://pypi.python.org/pypi/aerich)
[](https://github.com/long2ice/aerich)
[](https://github.com/long2ice/aerich/actions?query=workflow:pypi)
[](https://github.com/long2ice/aerich/actions?query=workflow:test)
## Introduction
Aerich is a database migrations tool for Tortoise-ORM, which like alembic for SQLAlchemy, or Django ORM with it\'s own
migrations solution.
~~**Important: You can only use absolutely import in your `models.py` to make `aerich` work.**~~
From version `v0.5.0`, there is no such limitation now.
## Install
Just install from pypi:
```shell
> pip install aerich
```
## Quick Start
```shell
> aerich -h
Usage: aerich [OPTIONS] COMMAND [ARGS]...
Options:
-c, --config TEXT Config file. [default: aerich.ini]
--app TEXT Tortoise-ORM app name. [default: models]
-n, --name TEXT Name of section in .ini file to use for aerich config.
[default: aerich]
-h, --help Show this message and exit.
Commands:
downgrade Downgrade to specified version.
heads Show current available heads in migrate location.
history List all migrate items.
init Init config file and generate root migrate location.
init-db Generate schema and generate app migrate location.
inspectdb Introspects the database tables to standard output as...
migrate Generate migrate changes file.
upgrade Upgrade to latest version.
```
## Usage
You need add `aerich.models` to your `Tortoise-ORM` config first, example:
```python
TORTOISE_ORM = {
"connections": {"default": "mysql://root:123456@127.0.0.1:3306/test"},
"apps": {
"models": {
"models": ["tests.models", "aerich.models"],
"default_connection": "default",
},
},
}
```
### Initialization
```shell
> aerich init -h
Usage: aerich init [OPTIONS]
Init config file and generate root migrate location.
Options:
-t, --tortoise-orm TEXT Tortoise-ORM config module dict variable, like settings.TORTOISE_ORM.
[required]
--location TEXT Migrate store location. [default: ./migrations]
-h, --help Show this message and exit.
```
Init config file and location:
```shell
> aerich init -t tests.backends.mysql.TORTOISE_ORM
Success create migrate location ./migrations
Success generate config file aerich.ini
```
### Init db
```shell
> aerich init-db
Success create app migrate location ./migrations/models
Success generate schema for app "models"
```
If your Tortoise-ORM app is not default `models`, you must specify
`--app` like `aerich --app other_models init-db`.
### Update models and make migrate
```shell
> aerich migrate --name drop_column
Success migrate 1_202029051520102929_drop_column.sql
```
Format of migrate filename is
`{version_num}_{datetime}_{name|update}.sql`.
And if `aerich` guess you are renaming a column, it will ask `Rename {old_column} to {new_column} [True]`, you can
choice `True` to rename column without column drop, or choice `False` to drop column then create, note that the after maybe lose data.
### Upgrade to latest version
```shell
> aerich upgrade
Success upgrade 1_202029051520102929_drop_column.sql
```
Now your db is migrated to latest.
### Downgrade to specified version
```shell
> aerich init -h
Usage: aerich downgrade [OPTIONS]
Downgrade to specified version.
Options:
-v, --version INTEGER Specified version, default to last. [default: -1]
-d, --delete Delete version files at the same time. [default:
False]
--yes Confirm the action without prompting.
-h, --help Show this message and exit.
```
```shell
> aerich downgrade
Success downgrade 1_202029051520102929_drop_column.sql
```
Now your db rollback to specified version.
### Show history
```shell
> aerich history
1_202029051520102929_drop_column.sql
```
### Show heads to be migrated
```shell
> aerich heads
1_202029051520102929_drop_column.sql
```
### Inspect db tables to TortoiseORM model
```shell
Usage: aerich inspectdb [OPTIONS]
Introspects the database tables to standard output as TortoiseORM model.
Options:
-t, --table TEXT Which tables to inspect.
-h, --help Show this message and exit.
```
Inspect all tables and print to console:
```shell
aerich --app models inspectdb
```
Inspect a specified table in default app and redirect to `models.py`:
```shell
aerich inspectdb -t user > models.py
```
Note that this command is restricted, which is not supported in some solutions, such as `IntEnumField`
and `ForeignKeyField` and so on.
### Multiple databases
```python
tortoise_orm = {
"connections": {
"default": expand_db_url(db_url, True),
"second": expand_db_url(db_url_second, True),
},
"apps": {
"models": {"models": ["tests.models", "aerich.models"], "default_connection": "default"},
"models_second": {"models": ["tests.models_second"], "default_connection": "second", },
},
}
```
You need only specify `aerich.models` in one app, and must specify `--app` when run `aerich migrate` and so on.
## Support this project
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## License
This project is licensed under the
[Apache-2.0](https://github.com/long2ice/aerich/blob/master/LICENSE) License.