From: sur max <sur.max@...>
Date: 2007-02-16T22:40:32+09:00
Subject: Re: class design issues

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But i think there is a point to discuss here...

as lf1.name is simply an instance method which is(should be) only capable of
returning the instance variable "@name"

so by defining :name as attr_reader should block everything which is trying
to write the instance variable "@name"



On 2/16/07, sur max <sur.max@gmail.com> wrote:
>
> It means even need not to go for lf1.instance_variable_set
>
> it is pretty working as
>
> lf1.name.gsub!(/.*/,"")
>
> lf1.name << "new broken name"
>
> On 2/16/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
> >
> > Hi --
> >
> > On Fri, 16 Feb 2007, sur max wrote:
> >
> > > Hi David,
> > >
> > > Now this should not be available !!
> > >
> > > lf1.name << "more stuffs"
> > > this should generate error !! ... (i agree it is working)
> >
> > Strings response to "<<", so assuming lf1.name returns a string,
> > there's no error of any kind here.
> >
> > > but is name is an attr_reader then the manipulations with "<<" should
> > not be
> > > supported, as the case of "="
> > > or it should be ?
> >
> > It's not really that = is or is not supported; it's all a matter of
> > what methods you define.  If you define a method that returns a
> > string, then you get a string, which is mutable, from that method.
> > The notion of an "attribute" is really in the mind of the programmer.
> > Objects don't know whether they're attributes or not; they just exist,
> > and do what they're told.
> >
> >
> > 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)
> >
> >
>
>
> --
> sur
> http://expressica.com




-- 
sur
http://expressica.com

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