cup_size.rb

class Sizes::CupSize < Size

  US = %w[A B C D DD/E DDD/F DDDD/G DDDDD/H]
  EU = %w[A B C D E F G H]
  UK = %w[A B C D DD E F FF]

  [:us, :uk, :eu].each do |region|
    class_eval %Q"
      def #{region}
        by_region(:#{region})
      end
    "
  end

  private

  def by_region(r)
    "Sizes::CupSize::#{r.to_s.upcase}".constantize[read_attribute(r).to_i-1]
  end

end