From: Michael Jackson <mjijackson@...>
Date: 2010-07-08T11:32:02+09:00
Subject: Re: Extending OpenStruct to be lazy and recursive

I've done something similar that's pretty lightweight. My version
actually extends Hash, so it should be pretty fast and you get all the
niceties of Hash for free.

http://mjijackson.com/symboltable
http://github.com/mjijackson/symboltable

--
Michael Jackson
http://mjijackson.com
@mjijackson



On Wed, Jul 7, 2010 at 6:29 PM, Benjamin Kudria <ben@kudria.net> wrote:
> I'm trying to extend OpenStruct for an application I'm building, where
> I'd like to access nested hashes as models. OpenStruct (in core) sounds
> perfect for this, but I ran into two problems:
>
>  - Recursion
>    My hashes have nested hashes, and I want to convert *those* to
> objects, too. I was able to solve this problem pretty easily, see the
> to_self method in the linked code [1].
>
> However, this made me run into the second problem - speed. I was loading
> rather large documents, and it was taking quite a bit of time to go
> through them, instantiating classes for everything. I though I'd make
> the code lazy-load, using the lazy.rb [0]
>
> However, I overrode some more core methods for OpenStruct, to create
> promises, and demand them, but now the code simply produces incorrect
> results.
>
> In IRB, I do:
>> LazyStruct.new({:a=>1, :b => 2}).a
>
> But my result is 2, not 1. The code is here:
> http://gist.github.com/467459
>
> What could be going wrong? Any inishgt would be appreciatted. I'm using
> Ruby 1.9.2-preview3
>
> (Apologies for the Railsisms, this is part of a Rails project. The
> classify method turns things into a string resembling a class, and
> constantize turns that string into a constant - hopefully a class. This
> code is bypassed in my simple example.)
>
> 0: http://github.com/mental/lazy
>
> Thanks!
> Benjamin Kudria
> ben@kudria.net
> --
> Posted via http://www.ruby-forum.com/.
>
>