Broken Module Prepend in Ruby

gistfile1.rb

module ExtraMessageLogging
  def do_something
    super
    puts "Prepend from #{self.class.name}"
  end
end

module AnotherExtraMessageLogging
  def do_something
    super
    puts "Prepend from #{self.class.name}"
  end
end

class ParentClass
  def do_something
    puts "In parent"
  end
  prepend ExtraMessageLogging
end

class ChildClass < ParentClass
  def do_something
    puts "In child"
  end
  prepend ExtraMessageLogging
end

class AnotherChildClass < ParentClass
  def do_something
    puts "In smarter child"
  end
  prepend AnotherExtraMessageLogging
end

ParentClass.new.do_something

p '----'

ChildClass.new.do_something

p '----'

AnotherChildClass.new.do_something