Question

I want to invoke method a from method of module B. How can I do it? I don’t want to specify A::a every time.

module A
  def self.a
    "a"
  end
end

module B
  extend A

  def self.b
    a
  end
end

p B::b  # => undefined local variable or method `a' for B:Module

Answer 1

I found here a method to solve it but it doesn’t look good to me:

module A 
  module ClassMethods
    def a
      puts "a"
    end
  end
  extend ClassMethods
  def self.included( other )
    other.extend( ClassMethods )
  end
end

module B
  include A

  def self.b
    a
  end
end

p B::b  # => "a"