Doctrine\DBAL\Migrations\Tools\Console\Command\MigrateCommand::getVersionNameFromAlias PHP 메소드

    private function getVersionNameFromAlias($versionAlias, OutputInterface $output, Configuration $configuration)
    {
        $version = $configuration->resolveVersionAlias($versionAlias);
        if ($version === null) {
            if ($versionAlias == 'prev') {
                $output->writeln('<error>Already at first version.</error>');
                return false;
            }
            if ($versionAlias == 'next') {
                $output->writeln('<error>Already at latest version.</error>');
                return false;
            }
            $output->writeln(sprintf('<error>Unknown version: %s</error>', $output->getFormatter()->escape($versionAlias)));
            return false;
        }
        return $version;
    }