Rewriting accessor methods by a macro

Help & Support
1

Hello, I want to iterate all my entity subclasses and then iterate all their instvars and generate some method for each instvar by a macro, something like this (there are entity classes already defined in another files with My::Entityas superclass) :

module My::Entities
  {% for cls in My::Entity.subclasses %}
  class {{cls.id}}
    def hard_coded_method_just_for_testing
      puts "something"
    end

    {% for atr in @type.instance_vars %}
    def {{atr.id}}
      puts "--- getting attr #{{{atr.stringify}}}"
    end
    {% end %}
  end
  {% end %}
end

But methods in the nested for macro cycle are not generated (method hard_coded_method_just_for_testing is generated successfully for all classes), so iteration over subclasses is OK, but iteration over their instvars does nothing.

Thanks very much for advice.

2

This is not possible to do. When macros run outside of methods instance vars of classes are not yet known.

3

OK, thanks.

Is there any way, that I can redefine existing getters of various existing classes with my new implementation (automatically, by a macro, not by hard-coding it one-by-one of course)?

I want to inject some fucntionality into existing property getters/setters (something like before/after aspects with the ability to ignore original getter/setter implementation)?