Doctrine\ODM\MongoDB\UnitOfWork::computeSingleDocumentChangeSet PHP Method

    private function computeSingleDocumentChangeSet($document)
    {
        $state = $this->getDocumentState($document);
        if ($state !== self::STATE_MANAGED && $state !== self::STATE_REMOVED) {
            throw new \InvalidArgumentException('Document has to be managed or scheduled for removal for single computation ' . $this->objToStr($document));
        }
        $class = $this->dm->getClassMetadata(get_class($document));
        if ($state === self::STATE_MANAGED && $class->isChangeTrackingDeferredImplicit()) {
            $this->persist($document);
        }
        // Compute changes for INSERTed and UPSERTed documents first. This must always happen even in this case.
        $this->computeScheduleInsertsChangeSets();
        $this->computeScheduleUpsertsChangeSets();
        // Ignore uninitialized proxy objects
        if ($document instanceof Proxy && !$document->__isInitialized__) {
            return;
        }
        // Only MANAGED documents that are NOT SCHEDULED FOR INSERTION, UPSERT OR DELETION are processed here.
        $oid = spl_object_hash($document);
        if (!isset($this->documentInsertions[$oid]) && !isset($this->documentUpserts[$oid]) && !isset($this->documentDeletions[$oid]) && isset($this->documentStates[$oid])) {
            $this->computeChangeSet($class, $document);
        }
    }