Record class changes and replay them. This may not look particularly useful at first, but combined with the Syncro gem (github.com/maccman/syncro), you can easily implement Ruby class synchronisation between remote clients.

Example:

require "scriber"

class Test
  class << self
    def var
      @var
    end

    def var=(v)
      @var = v
    end

    def scribe_play(type, data)
      case type
      when :var=
        self.var = data
      end
    end
  end
end

Scriber.record(Test, :var=, 1)
Scriber.record(Test, :var=, 2)
Scriber.record(Test, :var=, 3)

Scriber.play
Test.var #=> 3

To persist Scriber recordings, setup SuperModel's marshalling:

SuperModel::Marshal.path = “dump.db” SuperModel::Marshal.load

at_exit

SuperModel::Marshal.dump