Easy peasy serializer separation for DDD

gistfile1.txt

# app/controllers/users_controller.rb

class UsersController < ApplicationController
  respond_to :json, :xml

  def show
    @user = @user.find(params[:id])
    respond_with Serializer(@user)
  end
end

serialize.rb

# app/models/user/serialize.rb

class User::Serialize < ::Serializer
  def as_json(options = {})
    @object.as_json({ ... }.merge(options))
  end

  def to_xml(options = {})
    ...
  end
end

serializer.rb

# lib/serializer.rb

class Object
  def Serializer(object)
    serializer = object.class.const_get('Serialize') rescue nil
    serializer ? serializer.new(object) : object
  end
end

class Serializer
  def initialize(object)
    @object = object
  end

  def method_missing(m, *args, &block)
    @object.respond_to?(m) ? @object.send(m, *args, &block) : super
  end
end