eager_load, preload, includesの違い（自分用まとめ） - Qiita

SELECT `users`.`id` AS t0_r0, `users`.`name` AS t0_r1, `users`.`created_at` AS t0_r2, `users`.`updated_at` AS t0_r3, `posts`.`id` AS t1_r0, `posts`.`user_id` AS t1_r1, `posts`.`created_at` AS t1_r2, `posts`.`updated_at` AS t1_r3 FROM `users` LEFT OUTER JOIN `posts` ON `posts`.`user_id` = `users`.`id` SELECT `users`.`id` AS t0_r0, `users`.`name` AS t0_r1, `users`.`created_at` AS t0_r2, `users`.`upd

[kent-where-the-light-is]

“includes 空気を読んで、eager_loadの挙動かpreloadの挙動に変わる。”