gistfile1.txt

class Person
   PEOPLE=[]
   attr_reader :name, :hobbies, :friends
   
   def initialize(name)
       @name=name
       @hobbies= []
       @friends= []
       PEOPLE<<self
   end

   def has_hobby(hobby)
      @hobbies << hobby
   end
   
   def has_friend(friend)
      @friends << friend
   end
   
   def self.method_missing(m,*args)
      method=m.to_s
      if method.start_with?("all_with_")
         attr=method[9..-1]
         if self.public_method_defined(attr)
            PEOPLE.find_all do |person|
              person.send(attr).include?(args[0])
            end
            else
            raise ArgumentError, "Cant find #{attr}"
         end
      else
      super
      end
   end
   
end

mor=Person.new("mor")
mor.has_friend("yossi")
p Person.all_with_yossi