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include MongoMapper::EmbeddedDocument
class User
  include MongoMapper::Document
  one :person, :class_name => 'Person', :foreign_key => :owner_id
end

class Person
  include MongoMapper::Document
  include ROXML

  xml_accessor :_id
  xml_accessor :email
  xml_accessor :url
  xml_accessor :profile, :as => Profile

  key :email, String, :unique => true
  key :url, String
  key :owner_id, ObjectId

  belongs_to :owner, :class_name => 'User'
  one :profile, :class_name => 'Profile'
end

class Profile
  include MongoMapper::EmbeddedDocument
  include ROXML

  xml_reader :person_id
  xml_accessor :first_name
  xml_accessor :last_name
  xml_accessor :image_url

  key :first_name, String
  key :last_name, String
  key :image_url, String
end

def real_name
  "#{person.profile.first_name.to_s} #{person.profile.last_name.to_s}"
end