From: KJF <Kevin.Fagan1@...>
Date: 2007-03-29T21:45:05+09:00
Subject: Re: Inheritance not working as expected

On Mar 29, 1:04 pm, "Chris Carter" <cdcar...@gmail.com> wrote:
> On 3/29/07, KJF <Kevin.Fag...@gmail.com> wrote:
>
>
>
> > I am trying to build up some classes using inheritance but I'm not
> > getting the expected results
>
> > Here are my classes and test data
>
> > class Control
> >         attr :attributes, true
>
> >         def initialize(x, y, w, h)
> >                 @attributes = {
> >                         'x'=>x,
> >                         'y'=>y,
> >                         'h'=>w,
> >                         'w'=>h
> >                 }
> >         end
>
> >         def getAttributes
> >                 return @attributes
> >         end
> > end
>
> > class StaticTextControl < Control
>
> >         def initialize(x, y, w, h, xBorder, yBorder, fontSize, fontMode,
> > phrase)
> >                 super(x, y, w, h)
> >                 @@desc = 'STATIC_TEXT_CONTROL'
> >                 @attributes = {
> >                         'xBorder'=>xBorder,
> >                         'yBorder'=>yBorder,
> >                         'fontSize'=>fontSize,
> >                         'fontMode'=>fontMode,
> >                         'phrase'=>phrase
> >                 }
> >         end
>
> >         def getAttributes
> >                 return @attributes.merge(super)
> >         end
> > end
>
> > stc = StaticTextControl.new(1,2,3,4,5,6,7,8,9)
> > puts stc.getAttributes
>
> > When I run the script I get this:
> > returning attributes {"phrase"=>9, "xBorder"=>5, "fontSize"=>7,
> > "yBorder"=>6, "fontMode"=>8}
> > phrase9xBorder5yBorder6fontSize7fontMode8
>
> > I am expecting the attributes from the super class to be included as
> > well.
> > Can anyone tell me what I'm doing wrong?
>
> > Thanks.
>
> You call super, which assigns the @attributes hash, then you just
> reassign it.  In the subclass you need to add to the hash not
> overwrite it.
>
> >                 super(x, y, w, h)
> >                 @@desc = 'STATIC_TEXT_CONTROL'
>
>                 @attributes.merge( {
>                          'xBorder'=>xBorder,
>                          'yBorder'=>yBorder,
>                          'fontSize'=>fontSize,
>                          'fontMode'=>fontMode,
>                          'phrase'=>phrase
>                 })
>
> Chris Carter
> concentrationstudios.com
> brynmawrcs.com

Thanks for the help guys, makes sense now.