Mongoid serialization and deserialization of Virtus value objects

example_usage.rb

class Bar
  include Virtus::ValueObject
  include Virtus::ValueObject::Mongoize

  values do
    attribute :bar, String
  end
end

class Foo
  include Mongoid::Document

  field :bar, :type => Bar
end

x = Foo.new(:bar => Bar.new(:bar => 'lol'))
x.save!

y = Foo.where(:bar => x.bar).first

y == x
y.bar == x.bar

mongoize.rb

module Virtus
  module ValueObject
    module Mongoize
      def self.included(base)
        base.extend ClassMethods
        base.class_eval do
          def mongoize
            as_json
          end
        end
      end

      module ClassMethods
        def demongoize(object)
          new(object)
        end

        def mongoize(object)
          case object
          when self then object.mongoize
          when Hash then new(object).mongoize
          else object
          end
        end

        def evolve(object)
          case object
          when self then object.mongoize
          else object
          end
        end
      end
    end
  end
end