/**
* Tells the DocumentManager to make an instance managed and persistent.
*
* The document will be entered into the database at or before transaction
* commit or as a result of the flush operation.
*
* NOTE: The persist operation always considers documents that are not yet known to
* this DocumentManager as NEW. Do not pass detached documents to the persist operation.
*
* @param object $document The instance to make managed and persistent.
* @throws \InvalidArgumentException When the given $document param is not an object
*/
public function persist($document)
{
if (!is_object($document)) {
throw new \InvalidArgumentException(gettype($document));
}
$this->errorIfClosed();
$this->unitOfWork->persist($document);
}