How can a nested class access a method in the outer class in Ruby?

Question

def class A
  def a
    raise \"hi\" #can\'t be reached
  end

  class B
    def b
      a() #doesn\'t find method a.
    end
  end
end

I want to invok

Answer 1

You can use methods like parent, parent_name, parents to get outer modules, eg.:

class A
  def self.a; puts 'a!' end

  class B
    def self.b; parent.a end
  end
end

A::B.b #=> a!