はじめに Railsで書いてると、便利なRailsAPIやGemを知らないがために、 早くいってよぉ〜 と思うことが多々ありました。 後続の方の参考になればと、ここに残しておきます ;) 目次 Enum ActiveRecord::Enum Gemenum_help Decoratorパターン(Gemactive_decorator) ValueObject Struct.newとActiveRecord::Aggregations#composed_of ActiveRecord::Type Enum ActiveRecord::Enum https://github.com/rails/rails/blob/master/activerecord/lib/active_record/enum.rb Rails 4.1.0から導入 Before # status :integer not
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