class AWS::Record::Validator

def reject_unknown_options
  invalid_keys = options.keys - self.class::ACCEPTED_OPTIONS
  if invalid_keys.length == 1
    raise ArgumentError, "unknown option :#{invalid_keys.first}"
  elsif invalid_keys.length > 1
    bad = invalid_keys.collect{|k| ":#{k}" }.join(', ')
    raise ArgumentError, "unknown options #{bad}"
  end
end