How to access a attributes from the parent class?

ruby-talk
1

I am new to ruby and try to figure out how inheritance works.
I don't get the result I expect. I marked the line of code with "#error".
What do I need to do to get it to work?

    class WacFrames
      attr_reader :wacFrameNav
      attr_reader :wacFrameDisp
      def initialize()
        @wacFrameNav = "nav"
       @wacFrameDisp = "disp"
      end
    end

    class WacSubscribers
      attr_reader :fr
      attr_reader :frame
      def initialize()
   @fr = WacFrames.new()
  @frame = @fr.wacFrameNav
      end
    end
    
    class WacSubProfile < WacSubscribers
      def initialize()
  #some code
      end
      end
    end

    another = WacSubscribers.new()
    puts another.fr #works fine
    puts another.frame #works fine
    
    test = WacSubProfile.new()
    puts test.fr #error
    puts test.frame #error

Thanks

2

Paatsch, Bernd wrote:

I am new to ruby and try to figure out how inheritance works.
I don't get the result I expect. I marked the line of code with
"#error".
What do I need to do to get it to work?

<skip WacFrames />

    class WacSubscribers
      attr_reader :fr
      attr_reader :frame
      def initialize()
   @fr = WacFrames.new()
  @frame = @fr.wacFrameNav
      end
    end

    class WacSubProfile < WacSubscribers
      def initialize()
  #some code
      end
      end
    end

An extra 'end' there but I assume it is just a copy-paste error.

    another = WacSubscribers.new()
    puts another.fr #works fine
    puts another.frame #works fine

    test = WacSubProfile.new()
    puts test.fr #error
    puts test.frame #error

This should work fine (you might have problems if you
do not initialize the parent's instance variables by
calling #super but even still the methods should return
nils).

What error is it that you get?

Thanks

E

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