From: elbows@... (Nathan Weston)
Date: 2003-11-29T08:07:12+09:00
Subject: Re: Marshalling delegates [RESOLVED]

After digging around a bit in the delegate source, I fixed the problem
like this:

class MarshalDelegator < SimpleDelegator
  alias :make_methods :initialize

  def marshal_dump
    return @obj
  end

  def marshal_load(obj)
    initialize(obj)
  end
end

To marshal, the delegator just dumps the object it is delegating for.
To unmarshal, it loads that object, and sets up the wrapper methods by
calling initialize.




matz@ruby-lang.org (Yukihiro Matsumoto) wrote in message news:<1069385366.583829.29360.nullmailer@picachu.netlab.jp>...
> Hi,
> 
> In message "Marshalling delegates"
>     on 03/11/21, Nathan Weston <elbows@spamcop.net> writes:
> 
> |I can't seem to marshal a delegate. The code below:
> |
> |class Foo < SimpleDelegate
> |end
> |
> |Marshal.dump(Foo.new(nil))
> |
> |Gives me an error:
> |TypeError: singleton can't be dumped
> |
> |The weird thing is that defining _dump or marshal_dump in Foo doesn't
> |make this problem go away.
> 
> It's a bug in 1.8.0.  Soon to be fixed.  Thank you.
> 
> 							matz.