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superって一体なんなんだ??(Ruby on Rails)

superとは

子クラスのインスタンスに対して、同名の親クラスのメソッドをそのまま呼び出すことが出来る
...と言われても、何だか分かりにくいので簡単なコードを書いてみました。

親クラスはHoge

class Hoge  
  def hogetyan
    "ほげちゃん"
  end
end

Hoge を継承している子クラスはPiyoMoke

class Piyo < Hoge
  def hogetyan
    "ピヨピヨ"
  end
end

class Moke < Hoge
  def hogetyan
    super
  end
end

Piyo に対してhogetyanを呼び出してみる

piyo = Piyo.new
piyo.hogetyan -> #ピヨピヨ
  • 親クラスのdef hogetyanはオーバーライドされてされている。

Moke に対してhogetyanを呼び出してみる

moke = Moke.new
moke.hogetyan -> #ほげちゃん
  • Mokeクラスのmokeというインスタンスに対してsuper(親クラスHogehogetyan)が実行される。
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