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  Ruby on Railsの木構造Gemのacts_as_treeで、N+1を消し去る - Qiita

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  • qiita.com/jin-jar-ale
  • テクノロジー
  • 2020/07/31

  SELECT "technologies".* FROM "technologies" WHERE "technologies"."parent_id" IS NULL SELECT 1 AS one FROM "technologies" WHERE "technologies"."parent_id" = $1 LIMIT $2 [["parent_id", 1], ["LIMIT", 1]] SELECT "technologies".* FROM "technologies" WHERE "technologies"."parent_id" = $1 [["parent_id", 1]] SELECT 1 AS one FROM "technologies" WHERE "technologies"."parent_id" = $1 LIMIT $2 [["parent_id",