Forum: Ruby on Rails yaml: custom saving and loading of specific classes

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Bob J. (Guest)
on 2006-01-12 06:07
I'm trying to use ruby's yaml library to serialise and deserialise some
legacy classes.  Simply adding a to_yaml_properties() method isn't
sufficient as special methods need to be called to get and set the
properties (they're not stored simply in instance variables that I can
access), and I don't want to change the class any more than I have to.
Can anyone offer any pointers on how to get some custom code executed
when an instance of such a class is serialised and deserialised?  What
I'd like to do is, when I call YAML.dump(), and it sees an instance of
the legacy class, to convert it into some data structure and dump that,
and do the reverse on YAML.load().  I'm guessing I can do part of this
with the to_yaml() function, but I haven't been able to find an adequate
reference anywhere.  I'd really appreciate any help anyone could give
me.  Thanks.
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