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ActiveRecord findメソッドにidを配列で渡した結果はRelationではない

Last updated at 2015-03-29Posted at 2015-01-12

Rails4でfindにidの配列を渡すと、

profiles = Profile.find [1,2,3,4,5]
  # =>  SELECT "profiles".* FROM "profiles"  WHERE "profiles"."id" IN (1, 2, 3, 4, 5)
profiles.class
  # => Array

となり、結果はただの配列でActiveRecordの恩恵を受けられません。
素直にwhereで取得したほうがいいです。SQLも同じなので特に問題なさそうです。

profiles = Profile.where id: [1,2,3,4,5]
  # =>  SELECT "profiles".* FROM "profiles"  WHERE "profiles"."id" IN (1, 2, 3, 4, 5)
profiles.class
  # => Profile::ActiveRecord_Relation

Environment

pry(main)> Rails.version
=> "4.1.6"

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