Marshal/Serialization Question

ruby-talk
1

Hello all,

I'm trying to Marshal some Ruby objects to file and I have a question
about parent classes. Say I have the following:

class Device
  @@id = 0
  @@id_map = Hash.new
  @@device_map = Hash.new

  def initialize(*args)
    id = @@id += 1
    @@id_map[self] = id
    @@device_map[id] = self
  end

  def self.id(device)
    return @@id_map[device]
  end

  def self.device(id)
    return @@device_map[id]
  end
end

class Foo < Device
  def initialize
    super
  end
end

Now, if I create a Foo class, dump it to file and then load it again
using Marshal, should I be able to use the id and device methods in the
parent class or will the class variables not be dumped and loaded?

···

--
Thanks!
Bryan
--
Posted via http://www.ruby-forum.com/.

2

Try it out. I'd say, most likely they are not dumped as classes are not serialized IIRC. Class variables are evil anyway... :slight_smile:

Kind regards

  robert

···

On 19.08.2008 23:38, Bryan Richardson wrote:

Hello all,

I'm trying to Marshal some Ruby objects to file and I have a question
about parent classes. Say I have the following:

class Device
  @@id = 0
  @@id_map = Hash.new
  @@device_map = Hash.new

  def initialize(*args)
    id = @@id += 1
    @@id_map[self] = id
    @@device_map[id] = self
  end

  def self.id(device)
    return @@id_map[device]
  end

  def self.device(id)
    return @@device_map[id]
  end
end

class Foo < Device
  def initialize
    super
  end
end

Now, if I create a Foo class, dump it to file and then load it again
using Marshal, should I be able to use the id and device methods in the
parent class or will the class variables not be dumped and loaded?