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【Sequelize】configファイルで環境変数を使いたい

Posted at

sequelize-cli

npm install --save-dev sequelize-cli
npx sequelize-cli init

こうするとRubyのActiveRecord風にSequelize経由でdbを操作することができるようになる。また、initで生成されたconfig/config.jsonからdbへの接続情報を指定することになる。

config.json
{
  "development": {
    "username": "root",
    "password": null,
    "database": "database_development",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "test": {
    "username": "root",
    "password": null,
    "database": "database_test",
    "host": "127.0.0.1",
    "dialect": "postgres"
  },
  "production": {
    "username": "root",
    "password": null,
    "database": "database_production",
    "host": "127.0.0.1",
    "dialect": "postgres"
  }
}

でも、jsonにパスワードなどを直接記入するのは避け、.envを使いたいところ。

.sequelizerc

そこで.sequelizercの登場。
プロジェクトのルートで

touch .sequelizerc
.sequelizerc
const path = require('path');

module.exports = {
    'config': path.resolve('./config', 'config.js'),
};

そして、先程のconfig.jsonconfig.jsにリネームし、内容を下記に書き換える。

config.js
module.exports = {
  development: {
    username: process.env.POSTGRES_USER,
    password: process.env.POSTGRES_PASSWORD,
    database: 'development',
    host: '127.0.0.1',
    dialect: 'postgres',
  },
}

このようにすることで、sequelizeのconfigに環境変数が利用できるようになった。

参考

Sequlize公式ドキュメント

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