How to determine if a Doctrine entity is persisted? - doctrine-orm

Question

Is there a way to determine if a parameter is an object that is already persisted by Doctrine or not? Something like an entity manager method that checks that an object is not a plain old object but actually something already in memory/persisted.
<?php
public function updateStatus(Entity $entity, EntityStatus $entityStatus)
{
$entityManager = $this->getEntityManager();
try {
// checking persisted entity
if (!$entityManager->isPersisted($entity)) {
throw new InvalidArgumentException('Entity is not persisted');
}
// ...
} catch (InvalidArgumentException $e) {
}
}

Answer 1

EDIT: As said by #Andrew Atkinson, it seems
EntityManager->contains($entity)
is the preferred way now.
Previous answer: You have to use UnitOfWork api like this:
$isPersisted = \Doctrine\ORM\UnitOfWork::STATE_MANAGED === $entityManager->getUnitOfWork()->getEntityState($entity);

Answer 2

The EntityManager method contains serves this purpose. See the documentation (2.4).
In Doctrine 2.4, the implementation looks like this:
class EntityManager {
// ...
public function contains($entity)
{
return $this->unitOfWork->isScheduledForInsert($entity)
|| $this->unitOfWork->isInIdentityMap($entity)
&& ! $this->unitOfWork->isScheduledForDelete($entity);
}

Answer 3

An Easier and more robust way to check if the entity is flushed or not, just check for the ID.
if (!$entity->getId()) {
echo 'new entity';
} else {
echo 'already persisted entity';
}
This solution is very much dependant on the case, but it may be the best for you
edit:
From comments it appears this is not the most relevant answer, however may provide useful for someone as it is closely related to the question.