friendship_redis_style.rb

class Friend < ActiveRecord::Base

 belongs_to :user
 belongs_to :contact, :class_name => "User", :foreign_key => "contact_id"

 # user befriends contact
 def self.befriend(user,contact)
    begin
     HELPERS.set_add contact.id, user.id
     HELPING.set_add user.id, contact.id
    rescue
     RedisLogger.info "Redis Exception"
    end
 end

end

class User < ActiveRecord::Base 
  
  has_many :friends, :dependent => :destroy
  has_many :contacts, :through => :friends, :order => "created_at DESC", :dependent => :destroy

end