Defining Dynamic Method and passing model as argument

dynamic_methods.rb

class Person
  attr_accessor :firstname
  attr_accessor :age
end

class Object
  def metaclass
    class << self; self; end
  end
end

class Main
  def create_method
    metaclass.instance_eval do
      define_method :print_my_data do |person|
        p "My name is #{person.firstname}"
        p "My age is #{person.age}"
      end
    end
  end
end

p1 = Person.new
p1.firstname = 'Subhash'
p1.age = 30
p2 = Person.new
p2.firstname = 'Sumedha'
p2.age = 23
m = Main.new
m.create_method
m.print_my_data(p1)
m.print_my_data(p2)