house.rb

require_relative 'building'
require_relative 'butler'

class House < Building
  attr_accessor :butler

  def initialize(name, width, length, butler_name)
    super(name, width, length)
    @butler = Butler.new(butler_name, self)
  end

  def self.price_per_square_meter(city)
    case city
    when 'Paris'
      return 10000
    when 'Brussels'
      return 5000
    else
      return nil
    end
  end

  def price
    return floor_area * 100
  end
end

p House.price_per_square_meter('Paris')
p House.price_per_square_meter('Brussels')
ma_maison = House.new('La Maison du Bonheur', 10, 10, 'Georges')
p ma_maison.butler.name
p ma_maison.butler.clean_associated_house

p ma_maison.butler.name
p ma_maison.butler.clean_associated_house

green_house = House.new('Green House', 10, 10, 'John')
p green_house.butler.clean_associated_house