def method_missing(name, *args, &block)
      return attr(name[0..-2], args[0]) if args.size == 1 and name[-1] == '='
    end
def method_missing(name, *args, &block)
      return attr(name[0..-2], args[0]) if args.size == 1 and name[-1] == '='
    end
Dynamically write value