class Warden::SessionSerializer

def deserialize(keys)
  klass_name, *args = keys
  begin
    klass = ActiveSupport::Inflector.constantize(klass_name)
    if klass.respond_to? :serialize_from_session
      klass.serialize_from_session(*args)
    else
      Rails.logger.warn "[Devise] Stored serialized class #{klass_name} seems not to be Devise enabled anymore. Did you do that on purpose?"
      nil
    end
  rescue NameError => e
    if e.message =~ /uninitialized constant/
      Rails.logger.debug "[Devise] Trying to deserialize invalid class #{klass_name}"
      nil
    else
      raise
    end
  end
end

def serialize(record)
  klass = record.class
  array = klass.serialize_into_session(record)
  array.unshift(klass.name)
end