wrapping_virtus.rb

value_object.rb

require 'virtus'

module ValueObject
  def self.new(&block)
    Class.new {
      include Virtus.value_object
      values do
        class_eval(&block)
      end
    }
  end
end

Person = ValueObject.new do
  attribute :name, String
  attribute :date_of_birth, Date

  def age
    (Date.today - date_of_birth).to_i
  end
end

person = Person.new(name: "John Doe", date_of_birth: "1970-01-01")
p person.age
p Person.new(name: "Anonymous") == Person.new(name: "Anonymous")