How can I make a property aware of changes on another?

Hello Daniel,     It sounds like you are looking for the magic that makes the Observer design pattern happen. In Ruby this is done using the Observable module. Example code here ; O'Reilly Media - Technology and Business Training

    FYI, I have NOT tried this under rails, but, I would be intrigued to hear how you get along with it. Let us all know how it goes :wink:     Regards     Stef

Daniel Mantilla wrote: