From: "Mariusz Pękala" <skoot@...>
Date: 2007-05-11T17:46:08+09:00
Subject: Re: instance_variables doesn't return unassigned variables

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On 2007-05-11 06:58:48 +0900 (Fri, May), Robert Dober wrote:
> On 5/10/07, Jesse Merriman <jesse.d.merriman@gmail.com> wrote:
> >On Thursday 10 May 2007 06:00, Bernd wrote:
> >> Hi,
> >> I wrote a code like this.
> >>
> >> class ABC
> >>   attr_accesor :first, :second
> >> end
> >>
> >> when I wrote the following:
> >>
> >> x =3D ABC.new
> >> x.first =3D "test"
> >> puts x.instance_variables
> >>
> >> the output was only
> >>
> >> @first
> >
> >You could deduce them by looking for methods that end in an equals:
> Hmm that might not be a good idea, a method ending in equals does not
> induce the creation of an instance variable with that name.
> One could however put attr on steroids by creating a list of
> attributes for the class.
> Look at this quick and dirty hack do see if this could be helpfull for you
>=20
> class Module
>  alias_method :orig_attreader, :attr_reader
>  def attr_reader *symbols
>    @__atts__ ||=3D superclass.attributes.dup
>    @__atts__ +=3D symbols
>    @__atts__.uniq!
>    orig_attreader *symbols
>  end
>=20
>  def attributes
>    @__atts__ || []
>  end
> end
>=20
<snip>

=2E.or, since the original problem was that no instance variable has been
created, just create it (in quick and dirty way):

class Module
 alias_method :orig_attr, :attr
 def attr(symbol, writable =3D false)
   orig_attr symbol, writable
   send symbol
 end
 ...

--=20
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