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calling another method in super class in ruby

class A
  def a
    puts 'in #a'
  end
end

class B < A
  def a
    b()
  end
  def b
    # here i want to call A#a.
  end
end  
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by (71.8m points)
class B < A

  alias :super_a :a

  def a
    b()
  end
  def b
    super_a()
  end
end  

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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