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  class MortgageApplication
    include Validatable
    validates_presence_of :ssn, :groups => [:saving, :underwriting]
    validates_presence_of :name, :groups => :underwriting
    attr_accessor :name, :ssn
  end

  application = MortgageApplication.new
  application.ssn = 377990118
  application.valid_for_saving? #=> true
  application.valid_for_underwriting? #=> false

  class Person
    include Validatable
    validates_true_for :first_name, :logic => lambda { first_name == 'Book' }
    attr_accessor :first_name
  end

  person = Person.new
  person.valid? #=> false
  person.first_name = 'Book'
  person.valid? #=> true

  class Person
    include Validatable
    validates_numericality_of :age
  end

class Person
  include Validatable
  validates_presence_of :name
  attr_accessor :name
end
 
class ValidatesPresenceOf
  after_validate do |result, instance, attribute|
    instance.errors.add("#{attribute} can't be blank") unless result
  end
end

person = Person.new
person.valid? #=> false
person.errors.on(:name) #=> "name can't be blank"

  class Person
    include Validatable
    validates_presence_of :name
    attr_accessor :name
  end

  class PersonPresenter
    include Validatable
    include_validations_for :person, :map => { :name => :namen }, 
                            :if => lambda { not person.nil? }
    attr_accessor :person

    def initialize(person)
      @person = person
    end
  end

  presenter = PersonPresenter.new(Person.new)
  presenter.valid? #=> false
  presenter.errors.on(:namen) #=> "can't be blank"