From: Mark Noworolski <jmarkn@...>
Date: 2006-12-11T14:43:22+09:00
Subject: Re: Question on IO objects, initialize, and yaml

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I _want_ to use a built-in hook (the ruby way, if you will), if I can figure
out which one and how to use it.

Based on your suggestion, I've googled and found this code:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/104402

Now, I've experimented with initialize_copy on this code and your
recommendation, and I cannot get it to do what I want.

Anybody got any other suggestions, or a concrete example for me?
mark


On 12/10/06, Eric Hodel <drbrain@segment7.net> wrote:
>
> On Dec 10, 2006, at 12:19 , Mark Noworolski wrote:
>
> > Say I have a class with pseudo code as follows:
> > class Test
> > def initialize
> >  @a=1
> >  @b=File.open("file+Time.now or similar")
> > end
> > end
> >
> > Now, imagine that I use this class for a while and then I want to
> > dump it to
> > a YAML file.
> >
> > When I restart my code, I want it to read in stuff from the YAML
> > file (if it
> > exists) and use that as a starting point to work from (basically, I am
> > saving state in the yaml file). You'll note that I cannot just do
> > this as
> > is, because reading in from YAML does not initialize the class, so
> > @b would
> > not be initialized correctly on restart.
>
> Ruby and YAML provide hooks to cause things to happen when you load
> from Marshal or YAML.  I think #initialize_copy gets called for
> Marshal, I don't know the YAML ones, but  they should be easy to find.
>
> > I'd like to just initialize the thing, then read in the YAML file to
> > overwrite the state with the saved values. Is there some extremely
> > obvious
> > ruby way to do this or something equivalent?
>
> Don't do this, use the built-in hooks, that's what they're for.
>
> --
> Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
>
> I LIT YOUR GEM ON FIRE!
>
>
>

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