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RailsでON句を綺麗に書きたい

Last updated at Posted at 2021-11-19

目的

ActiveRecordで、(WHERE句でなく)ON句で絞り込んでからテーブルをJOINしたいが、ON句用のメソッドがない。
できるだけActiveRecordっぽく、綺麗に書きたい。

結論

テーブルをJOINする.join()の直後に、.join("AND ...")でON句は直書きする。

Sample.joins(:users) # usersテーブルをJOIN
      .joins("AND users.type = #{User::USERTYPE_COOK}") # 調理師(ON句)
      .where(users: {id: params[:user_id]} )
SELECT `samples`.* 
FROM `samples` 
INNER JOIN `users` 
  ON `users`.`id` = `samples`.`user_id`
  AND users.type = "cook"
WHERE `users`.`id` = 1
;

備考

.merge()を試したがダメだった。

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