private function getMigrationPaths($edition = null)
    {
        $allMigrationPaths = $this->facts->getMigrationPaths();

        if (is_null($edition)) {
            return $allMigrationPaths;
        }

        $migrationPaths = [];
        foreach ($allMigrationPaths as $migrationEdition => $migrationPath) {
            if (strtolower($migrationEdition) === strtolower($edition)) {
                $migrationPaths[$migrationEdition] = $migrationPath;
                break;
            }
        }

        return $migrationPaths;
    }