Doctrine\ODM\PHPCR\UnitOfWork::merge PHP Method

    public function merge($document)
    {
        $visited = array();
        return $this->doMerge($document, $visited);
    }

 /**
  * {@inheritDoc}
  *
  * Merge the state of the detached object into the persistence context of
  * this ObjectManager and returns the managed copy of the object.
  *
  * This will copy all fields of $document over the fields of the managed
  * document and then cascade the merge to relations as configured.
  *
  * The object passed to merge will *not* become associated/managed with
  * this ObjectManager.
  *
  * @param object $document The document to merge over a persisted document
  *      with the same id.
  *
  * @return object The managed document where $document has been merged
  *      into. This is *not* the same instance as the parameter.
  *
  * @throws InvalidArgumentException if $document is not an object.
  */
 public function merge($document)
 {
     if (!is_object($document)) {
         throw new InvalidArgumentException('Parameter $document needs to be an object, ' . gettype($document) . ' given');
     }
     $this->errorIfClosed();
     return $this->unitOfWork->merge($document);
 }