class ActiveRecord::Coders::ColumnSerializer

def load(payload)
  if payload.nil?
    if @object_class != ::Object
      return @object_class.new
    end
    return nil
  end
  object = coder.load(payload)
  assert_valid_value(object, action: "load")
  object ||= object_class.new if object_class != Object
  object
end