Wrap instance methods of object to log them

methods_wrapper.rb

class User
  def say
    puts "Hello"
  end
end

def override_instance_methods(c)
  c.instance_methods(false).each do |m|
    c.class_eval <<-RUBY
      alias #{m}_original #{m}
      def #{m}(*args, &block)
        puts "Called #{c.name}##{m}"
        #{m}_original(*args, &block)
      end
    RUBY
  end
end

override_instance_methods User
User.new.say 
# => Called User#say
# => Hello