class AWS::Record::InclusionValidator

def validate_attribute record, attribute_name, value_or_values
  each_value(value_or_values) do |value|
    included = if value.is_a?(Enumerable)
      value.all?{|v| value_included?(v) }
    else
      value_included?(value)
    end
    record.errors.add(attribute_name, message) unless included
  end
end