NullObject
==========

Adds a :null_object option to ActiveRecord has_one and belongs_to associations for specifying an object to be returned in place of nil

Implements the null object pattern as described in 'Refactoring - Ruby Edition' (Addison-Wesley)

Just a very experimental start - use at your own peril. For feedback please contact me at ingo@ingoweiss.com

Example
=======

user.country = nil
user.country.name
=> 'Missing country'

classs User < ActiveRecord::Base

  belongs_to :country, :null_object => MissingCountry.instance
  
  def missing?
    false
  end
  
end

class MissingCountry
  
  def missing?
    true
  end
  
  def name
    'Unknown country'
  end
  
end


Copyright (c) 2008 Ingo Weiss, released under the MIT license