gistfile1.rb

class User
  include MongoMapper::Document
  
  key :uid,                             String, :required => true, :unique => true     
  one :profile
end

class Profile
  include MongoMapper::EmbeddedDocument

  embedded_in :user

  many  :industries
end

class Expertise
  include MongoMapper::EmbeddedDocument
	
  key :expertise, 			String, :required => true
  key :proficiency, 		Fixnum
end

class Industry < Expertise
  validates :expertise,		:unique_expertise => true,
                          :inclusion => { :in => Profile::INDUSTRIES }

  validates :proficiency, :inclusion => { :in => 0..4 },
                          :presence => true
end