gist: 80914


  
    
      message.rb
    
    
      
      
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              class Message < ActiveRecord::Base
  belongs_to :sender, :class_name => "User"
  belongs_to :receiver, :class_name => "User"
 
  validates_presence_of :body
 
  before_validation_on_create :set_read
 
  def set_read
    self.read = false
  end
 
  def not(who)
    if self.sender != who
      self.sender
    else
      self.receiver
    end
  end
end