// 基本構文
docker compose run api rails ---

// routes一覧確認
docker compose run api rails routes

// gemfileを編集後
docker compose build

// modelを作成+migrationも作成
docker compose run api rails g model model名

// db作成
docker compose run api rails db:create
docker compose run api rails db:migrate

// db削除
docker compose run api rails db:drop

// サービスのbashに入る
docker compose exec api /bin/bash

// railsコンソールに入る
rails c

$ docker compose exec db bash
bash-4.2# mysql -h 127.0.0.1 -P 3306 -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.40 MySQL Community Server (GPL)

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show database;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'database' at line 1
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| todo_development   |
| todo_test          |
+--------------------+
6 rows in set (0.00 sec)

mysql> use todo_development
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+----------------------------+
| Tables_in_todo_development |
+----------------------------+
| active_storage_attachments |
| active_storage_blobs       |
| ar_internal_metadata       |
| departments                |
| schema_migrations          |
| sections                   |
| task_statuses              |
| task_types                 |
| tasks                      |
| users                      |
+----------------------------+
10 rows in set (0.00 sec)

mysql> select * from users\G;
Empty set (0.00 sec)