trying modules instead of classes for the actions

gistfile1.rb

module Action
end

module Carry
  include Action
end

module ShowOff
  include Action
end

module Travel
  include Action
end

class Vehicle
  def capable_of?(x)
    puts self.ancestors.include?(x)
  end
end

class Car < Vehicle  
  include Travel
end

class Truck < Vehicle
  include Travel
  include ShowOff
end


Car.capable_of?(Travel)
Car.capable_of?(ShowOff)
Truck.capable_of?(ShowOff)