+ has_many :messages, :foreign_key => :to_user_id, :order => 'sent_on DESC'
+ has_many :new_messages, :class_name => "Message", :foreign_key => :to_user_id, :conditions => "message_read = 0", :order => 'sent_on DESC'
+ has_many :sent_messages, :class_name => "Message", :foreign_key => :from_user_id, :order => 'sent_on DESC'
+ has_many :friends, :include => :befriendee, :conditions => "users.visible = 1"
+ has_many :tokens, :class_name => "UserToken"
+ has_many :preferences, :class_name => "UserPreference"
+
+ validates_presence_of :email, :display_name
+ validates_confirmation_of :email, :message => 'Email addresses must match'