Ruby on Rails

Robert Walker wrote in post #1034162:
> The reason this happens is because Rails does not provide inter-model
> change notification. Take the line:

Oh and BTW. If anyone is wondering why not just add a change
notification system to ActiveRecord?Well, How far do you want to take
that. It might be relatively straightforward if you have only a single
instance of an application. However, to support scaling to multiple
instances, maybe on several servers, you'd have to provide some sort of
distributed change notification. Obviously, this complicates matters
extensively. It's very much easier to just go back to the database to
discover changes in the underlying state.

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