From: El Gato <wmwilson01@...>
Date: 2007-02-27T01:43:09+09:00
Subject: Re: Subclassing Array

Ilan Berci wrote:
> El Gato wrote:
>> I'm sure I'm just being an idiot here... my mind is a little foggy this
>> morning, but I'm having a hard time understanding how to accomplish
>> this.  I've written a class (I'll just put some snippets in for
>> understanding) in which I'd like to be able to use the following
>> behavior:
>> 
> 
> El Gato,
> 
> My suggestion is to take a good look at Ruby's incredibly powerfull use 
> of delegates 
> http://www.ruby-doc.org/stdlib/libdoc/delegate/rdoc/index.html 
> (documentation provided by James Earl Gray II)
> 
> Secondly, there is a great book entitled "Ruby Recipes", which discusses 
> your question in great detail and I higly recommend that you pick it 
> up..
> 
> Hope this helps and this is only a suggestion as there exists 100 ways 
> to do what you are asking.. :)
> 
> ilan


I'm not sure if I'm missing something, but it appears that calling map() 
on a DelegateClass still returns an Array object.  I guess I would need 
map() and friends to return an InventoryReport class (i.e., Array 
doesn't have a save method, whereas InventoryReport does, so calling 
report.query.map {...}.save "/tmp/filename.xls" fails)

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