public function up($limit = 0)
    {
        $migrations = $this->getNewMigrations();

        if (empty($migrations)) {
            $this->messages[] = 'No new migration found. Your system is up-to-date.';
            return true;
        }

        foreach ($migrations as $migration) {
            if (!$this->migrateUp($migration)) {
                $this->messages[] = "Migration {$migration} failed. The rest of the migrations are canceled.";
                return false;
            }
        }
        return true;
    }