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findで指定カラムの値のみを取得

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モデルのカラムの値一つだけが知りたいとき、findでselectオプションを使えば指定のカラムの値だけを取得することができる。

例えば、idが1のUserモデルについてusernameカラムの値だけが知りたい時、以下のように記述する。

User.find(1, select: "username")

SQL

SELECT username FROM `users` WHERE `users`.`id` = 1

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