From: Its Me <itsme213@...>
Date: 2004-04-03T04:49:20+09:00
Subject: Re: Madeline - avoiding Command objects by 'Delegate'?

Thanks! Is is nifty.

What is the recommended way to deal with changes to schema / object
structure? I recall seeing this discussed a long time ago on Prevalence but
am interested in the Ruby best practice.


"David Heinemeier Hansson" <david@loudthinking.com> wrote in message
news:1F2015C4-84CA-11D8-9D10-000A958E6254@loudthinking.com...
> > Is it possible to avoid writing explicit Command objects by using (and
> > extending) "delegate"? Could the delegator take care of command-object
> > wrapping, so the callers still makes normal method calls?
>
> Have a look at madeleine/automatic.rb. It includes an interceptor
> module that can be mixed into the service you're using Madeleine with
> and all the methods are automatically turned into commands. Very nifty.
>
> Instiki uses this method. It goes one step further, though, and pulls
> all the Madeleine goodies into one MadeleineService class that you can
> inheirit from to have automatic snapshots setup automatically and
> convenience methods for accessing the service as a singleton and for
> clearing the database.
>
> You can get Instiki (with source of course) from
> http://instiki.rubyforge.org.
> --
> David Heinemeier Hansson,
> http://www.basecamphq.com/   -- Web-based Project Management
> http://www.loudthinking.com/ -- Broadcasting Brain
>
>
>