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ポリモフィック

Rails

Posted at 2019-12-14

ポリモフィックのロジックを考えてみる

前提

下記が存在する
Articleモデル
Eventモデル
Commentモデル

記事を参考に実装してみると下記になる

2.3.0 :008 > Comment.first.commentable
  Comment Load (0.3ms)  SELECT  "comments".* FROM "comments" ORDER BY "comments"."id" ASC LIMIT ?  [["LIMIT", 1]]
  Event Load (0.2ms)  SELECT  "events".* FROM "events" WHERE "events"."id" = ? LIMIT ?  [["id", 1], ["LIMIT", 1]]
 => #<Event id: 1, name: "e1", content: "e_contet", created_at: "2019-12-08 02:19:18", updated_at: "2019-12-08 02:19:18">

参考記事

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