From: ycsunil <ycsunil@...>
Date: 2008-02-26T19:09:57+09:00
Subject: Re: attr_writer vs attr_accessor

On Feb 26, 2:38 pm, Thomas Wieczorek <wieczo...@googlemail.com> wrote:
> On Tue, Feb 26, 2008 at 9:29 AM, ycsunil <ycsu...@gmail.com> wrote:
> > Hello all,
>
> >  From readings I understood that attr_accessor is the one which has the
> >  property of attr_reader and attr_writer. If we define a variable as
> >  attr_writer, we can use it to read and write as well. My question is;
> >  why do we need to use attr_accessor since attr_writer does the job of
> >  read and write?
>
> Did you try it? I get an error, when I use the following
>
> irb(main):001:0> class Foo
> irb(main):002:1> attr_writer :bar
> irb(main):003:1> def initialize
> irb(main):004:2> @bar = "hallo"
> irb(main):005:2> end
> irb(main):006:1> end
> => nil
> irb(main):007:0> Foo.new.bar
> NoMethodError: undefined method `bar' for #<Foo:0x2ad5640 @bar="hallo">
>         from (irb):7
> irb(main):008:0>
>
> attr_writer just creates the bar=(value) method, no bar() method to
> access the attribute.

Thanks! for clearing the doubt with an example. In general I thought;
if varialbe can be writable then it should hold property of
readable... which is not true in attr_writer.