Response to http://www.naildrivin5.com/blog/2014/05/27/rails-does-not-define-your-application-architecture.html

en.yml

en:
  short_names:
    default:
      male: "Mr %{surname}"
      female: "Ms %{surname}"
  full_names:
    default:
      male: "%{given_name} %{surname}"
      female: "%{given_name} %{surname}"
      not_specified: "%{given_name} %{surname}"
    nationalities:
      chinese:
        male: "%{surname} %{given_name}"
        female: "%{surname} %{given_name}"
        not_specified: "%{surname} %{given_name}"

person.rb

class Person < ActiveRecord::Base
  def name
    given_name? ? full_name : short_name
  end

  def short_name
    I18n.t nationality, surname: surname,
      scope: :"short_names.nationalities.#{gender}",
      default: I18n.t(:"short_names.default.#{gender}")
  end

  def full_name
    I18n.t nationality,
      given_name: given_name, surname: surname,
      scope: :"full_names.nationalities.#{gender}",
      default: I18n.t(:"full_names.default.#{gender}")
  end
end