Sokil\Mongo\Structure::mergePartial PHP Метод

    private function mergePartial(array &$document, array $updatedDocument, $prefix = null)
    {
        foreach ($updatedDocument as $key => $newValue) {
            // if original data is embedded document and value also - then merge
            if (is_array($newValue) && isset($document[$key]) && $this->isEmbeddedDocument($document[$key])) {
                $this->mergePartial($document[$key], $newValue, $prefix . $key . '.');
            } else {
                $document[$key] = $newValue;
                $this->modifiedFields[] = $prefix . $key;
            }
        }
    }