From: Harry <ruby.hardware@...>
Date: 2007-03-03T22:11:58+09:00
Subject: Re: Question about attr_accessor

On 3/3/07, Roland Swingler <roland.swingler@gmail.com> wrote:
> Hi,
>
> I came across something unexpected today, and wondered if anyone could
> explain it to me. If I have this class:
>
> class Foo
>   def initialize
>     @bar = 0
>   end
>
>   attr_accessor :bar
>
>   def add
>     bar += 1
>   end
> end
>
> then the "add" function doesn't work - it complains about a nil
> object. You have to specifically put "self.bar += 1". Why is that - I
> thought that the "self" was implicitly there?
>
> Doing:
>
> f = Foo.new
> f.add
>
> works as the class stands, so you only seem to need the self if you
> are calling the accessor from within your class.
>
> Confused...
>
> TIA
> Roland
>
>
>
attr_accessor :bar refers to the instance variable @bar.
bar and @bar are not the same.


Harry

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