Nextras\Orm\Mapper\Dbal\StorageReflection\StorageReflection::getStoragePrimaryKey PHP Метод

    public function getStoragePrimaryKey()
    {
        if (!$this->storagePrimaryKey) {
            $primaryKeys = [];
            foreach ($this->platform->getColumns($this->storageName) as $column => $meta) {
                if ($meta['is_primary']) {
                    $primaryKeys[] = $column;
                }
            }
            if (count($primaryKeys) === 0) {
                throw new InvalidArgumentException("Storage '{$this->storageName}' has not defined any primary key.");
            }
            $this->storagePrimaryKey = $primaryKeys;
        }
        return $this->storagePrimaryKey;
    }