adding messaging function, needs tests...

app/models/message.rb

@@ -1,5 +1,10 @@
 class Message < ActiveRecord::Base
   belongs_to :user
   attr_accessible :creator_id, :message, :read, :receiver_id
-  
+  validates_presence_of :creator_id, :receiver_id, :message
+
+  def creator_name
+    creator = User.where(:id => self.creator_id).first
+    creator.full_name
+  end
 end