A simple example showing how attributes of objects that are objects are also serialized when we serialize the base object

YAML serialization

require 'yaml'

class RetainAttributeOfToYaml
  attr_accessor :name
  def initialize(name)
    @name = "Hi, my name is #{name}."
  end
end

class ToYaml
  attr_accessor :attribute_to_retain
  def initialize(attribute)
    @attribute_to_retain = attribute
  end
end

attribute1 = RetainAttributeOfToYaml.new("Schrodinger")
attribute2 = RetainAttributeOfToYaml.new("Cat")

ex1 = ToYaml.new(attribute1)
ex2 = ToYaml.new(attribute2)

ex1_serialized   = YAML::dump(ex1)
ex2_serialized   = YAML::dump(ex2)

ex1_deserialized = YAML::load(ex1_serialized)
ex2_deserialized = YAML::load(ex2_serialized)