From: yolanda washington <denise3664@...>
Date: 2011-02-14T03:45:18+09:00
Subject: Re: DCI and ruby

unsubscribe



----- Original Message ----
> From: Michel Demazure <michel@demazure.com>
> To: ruby-talk ML <ruby-talk@ruby-lang.org>
> Sent: Sun, February 13, 2011 10:26:03 AM
> Subject: Re: DCI and ruby
> 
> Andrew Wagner wrote in post #981397:
> > Hm, interesting question. Can you  give an example of when you might need
> > to
> > un-assign a role? It  only lasts for the length of the request anyway, if
> > I
> > understand  correctly.
> 
> I was thinking in general terms, not in a Rails setting. Just  thinking 
> about how the DCI idea could be useful in my work, as it seems very 
> ruby-esque (duck typing > classing).
> 
> I can imagine cases where the  given class has a given instance method, 
> say :foo. The object is assigned a  role where the :foo method is 
> redefined. Then you assign a new role, which  uses the generic :foo 
> method and you want it back.
> 
> If you use  mix/unmix, then when you assign (= mix) a role, you have to 
> know if you have  an already mixed-in role to unmix and which one. You 
> need to distinguish two  types of mixins, permanent and temporary. Just a 
> small addition to the  mechanism indeed, unless you want to mix (!) 
> things (including/excluding in  roles or vice versa). Difficult to say 
> more without real  examples.
> 
> Has this question something to do with the 'refinement'  proposal ?
> 
> _md
> 
> -- 
> Posted via  http://www.ruby-forum.com/.
> 
>