module ActiveRecord::Serialization

def attribute_names_for_serialization
  attribute_names
end

def serializable_hash(options = nil)
  if self.class._has_attribute?(self.class.inheritance_column)
    options = options ? options.dup : {}
    options[:except] = Array(options[:except]).map(&:to_s)
    options[:except] |= Array(self.class.inheritance_column)
  end
  super(options)
end