alias_method.rb

module ObjectTracker
  module ClassMethods
   def track_method(method_name)
    alias_method :"#{method_name}_without_tracking", method_name
    define_method :"#{method_name}_with_tracking" do |*splat|
      params = self.class.instance_method(:"#{method_name}_without_tracking").parameters.collect(&:last)
      self.send(:"#{method_name}_without_tracking", *splat) # do method first
      self.track_event!(method_name, Hash[*(params.zip(splat).flatten)]) # then track
    end
    alias_method method_name, :"#{method_name}_with_tracking"
  end
end
end
 
class Dog
  include ObjectTracker
  extend ObjectTracker::ClassMethods
  attr_accessor :name

  def initialize(name)
    @name = name
  end
 
  def go(yolo, swag)
    puts "Going to #{yolo}'s house #{swag}"
  end  

  def track_event!(method_name, attrs)
    # attrs is a hash of the arguments that the method was called with
    # convert them 
    attrs = attrs.keys.collect {|k| [k, attrs[k]].join("=") }

    # Do whatever you want with the instance variables, or the arguments the method was called with
    puts "<#{self.class}.#{method_name} name=#{@name} #{attrs.join(" ")}>"
  end  
end
 
Dog.track_method(:go)
Dog.new("Sparky").go('Ryan', "Swag")
puts
jon = Dog.new("Jon")
jon.go("Bark", "Woof")