regress example

$runner = Services::migrations();
        $group  = $params['g'] ?? CLI::getOption('g');

        if (is_string($group)) {
            $runner->setGroup($group);
        }

        try {
            $batch = $params['b'] ?? CLI::getOption('b') ?? $runner->getLastBatch() - 1;
            CLI::write(lang('Migrations.rollingBack') . ' ' . $batch, 'yellow');

            if (! $runner->regress($batch)) {
                CLI::error(lang('Migrations.generalFault'), 'light_gray', 'red'); // @codeCoverageIgnore             }

            $messages = $runner->getCliMessages();

            foreach ($messages as $message) {
                CLI::write($message);
            }

            CLI::write('Done rolling back migrations.', 'green');

            

    protected function regressDatabase()
    {
        if ($this->migrate === false) {
            return;
        }

        // If no namespace was specified then rollback all         if (empty($this->namespace)) {
            $this->migrations->setNamespace(null);
            $this->migrations->regress(0, 'tests');
        }

        // Regress each specified namespace         else {
            $namespaces = is_array($this->namespace) ? $this->namespace : [$this->namespace];

            foreach ($namespaces as $namespace) {
                $this->migrations->setNamespace($namespace);
                $this->migrations->regress(0, 'tests');
            }
        }
    }

foreach ($migrations as $migration) {
            if ($this->migrate('up', $migration)) {
                if ($this->groupSkip === true) {
                    $this->groupSkip = false;

                    continue;
                }

                $this->addHistory($migration, $batch);
            } else {
                $this->regress(-1);

                $message = lang('Migrations.generalFault');

                if ($this->silent) {
                    $this->cliMessages[] = "\t" . CLI::color($message, 'red');

                    return false;
                }

                throw new RuntimeException($message);
            }
        }