From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-11-17T22:58:56+09:00
Subject: Re: OpenStructable (was: OpenStruct#update)

On Wed, Nov 17, 2004 at 10:26:48PM +0900, trans.  (T. Onoma) wrote:
> | | While you are at it, please consider
> | |
> | | http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/3687
> | |
> | | and the other msgs in that thread.
> |
> | Okay, thanks. So what constitutes compatible marshal data?
> 
> Off the top of my head, would this work?
> 
>   def marshal_dump
>       Marshal.dump(@table)
>   end
> 
>   def marshal_load(obj)
>       @table = Marshal.load(obj)
>       @table.each_key{|key| self.new_ostruct_member(key) }
>   end

It introduces an unneeded indirection level (you end up
marshalling a string with the marshalled table; compare to
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/3690) and
doesn't solve the data compatibility problem: I believe that the goal
is having

# run with the new code
File.open("data", "w"){|f| f.write Marshal.dump(OpenStruct.new(:a => 1))}

# run with the old code
p Marshal.load(File.read("data"))  # we want => OpenStruct, not String or Hash

and vice versa.

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