accessors.rb

module BasiaAttr
  def basia_reader(method_name)
    define_method(method_name) do
      instance_variable_get("@#{method_name}".to_sym)
    end
  end

  def basia_writer(method_name)
    define_method("#{method_name}=") do |value|
      instance_variable_set("@#{method_name}".to_sym, value)
    end
  end

  def basia_accessor(*methods)
    methods.each do |method_name|
      basia_reader(method_name)
      basia_writer(method_name)
    end
  end
end

class Hello
  extend BasiaAttr

  basia_accessor :rower, :samochod

end

hello = Hello.new
hello.rower = "To jest nierower"
hello.samochod = "To jest samochod"
puts hello.rower
puts hello.samochod