How do I wrap the invocation of a Ruby method by including a module?

Question

I want to be notified when certain things happen in some of my classes. I want to set this up in such a way that the implementation of my methods in those classes doesn\'t c

Answer 1

I imagine you could use an alias method chain.

Something like this:

def notify_when(method)  
  alias_method "#{method}_without_notification", method
  define_method method do |*args|
    puts "#{method} called"
    send "#{method}_without_notification", args
  end
end

You do not have to modify methods yourself with this approach.