From: "David A. Black" <dblack@...>
Date: 2007-03-18T22:00:01+09:00
Subject: Re: attr_accessor

Hi --

On 3/18/07, Clifford Heath <no.spam@please.net> wrote:
> Corey Konrad wrote:
> > wow this attr_accessor thing is really great i can see this saving ALOT
> > of typing.
>
> If you want to check that assigned values are valid at the
> time of assignment (instead of later during validation),
> please consider using "typed_attr" from my "chattr" gem.
>
> gem install chattr
>
> class Foo
>         typed_attr String :bar do |v| v.size <= 20 end
> end
>
> Now you can't assign a string that's nil or more than 20 characters
> without an exception being thrown.

Wouldn't it be better to call that checked_attr?  I'm just thinking
that it's mostly checking the class, rather than the type (though
calling size on it implicitly means that it's of type "object that has
a size method"), so a more generic name might be good.


David

-- 
Q. What is THE Ruby book for Rails developers?
A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black)
   (See what readers are saying!  http://www.rubypal.com/r4rrevs.pdf)
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)