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

    public function isInIdentityMap($document)
    {
        $oid = spl_object_hash($document);
        if (!isset($this->documentIdentifiers[$oid])) {
            return false;
        }
        $class = $this->dm->getClassMetadata(get_class($document));
        $id = $this->getIdForIdentityMap($document);
        return isset($this->identityMap[$class->name][$id]);
    }

 /**
  * Determines whether a document instance is managed in this DocumentManager.
  *
  * @param object $document
  * @return boolean TRUE if this DocumentManager currently manages the given document, FALSE otherwise.
  */
 public function contains($document)
 {
     if (!is_object($document)) {
         throw new \InvalidArgumentException(gettype($document));
     }
     return $this->unitOfWork->isScheduledForInsert($document) || $this->unitOfWork->isInIdentityMap($document) && !$this->unitOfWork->isScheduledForDelete($document);
 }