GraphAware\Neo4j\OGM\Repository\BaseRepository::findOneBy PHP Метод

    public function findOneBy($key, $value)
    {
        $instances = $this->findBy($key, $value);
        if (count($instances) > 1) {
            throw new \Exception('Expected only one result, got ' . count($instances));
        }
        return isset($instances[0]) ? $instances[0] : null;
    }