simplifying definition of the comparison operator in ruby

compare_by.rb

class Object
    def self.compare_by(*methods)
        include Comparable
        define_method('<=>') do |other|
          methods.inject(0) do |_,method|
            comp = self.send(method) <=> other.send(method)
            break comp if comp != 0
            comp
          end
        end
    end
end

class T
    def initialize(name,f1, f2) 
      @name,@f1, @f2 = name,f1, f2; 
    end

    def f1
      puts "checking #@name's f1"
      @f1
    end
    def f2
      puts "checking #@name's f2"
      @f2
    end

    compare_by  :f1, :f2
end

x = T.new('x',1,2)
y = T.new('y',2,3)
z = T.new('z',2,4)

p x < y #=> checking x's f1
        #   checking y's f1
        #   true
p x < z #=> checking x's f1
        #   checking z's f1
        #   true
p y > z #=> checking y's f1
        #   checking z's f1
        #   checking y's f2
        #   checking z's f2
        #   false