doctrine / orm

    /**

     * {@inheritDoc}

     */

    public function slice(PersistentCollection $collection, $offset, $length = null)

    {

        $mapping   = $collection->getMapping();

        $persister = $this->uow->getEntityPersister($mapping['targetEntity']);

        return $persister->getManyToManyCollection($mapping, $collection->getOwner(), $offset, $length);

    }

    /**

     * {@inheritdoc}

     */

    /**

     * {@inheritdoc}

     */

    public function count(PersistentCollection $collection)

    {

        $mapping   = $collection->getMapping();

        $persister = $this->uow->getEntityPersister($mapping['targetEntity']);

        // only works with single id identifier entities. Will throw an

        // exception in Entity Persisters if that is not the case for the

        // 'mappedBy' field.

        $criteria = new Criteria(Criteria::expr()->eq($mapping['mappedBy'], $collection->getOwner()));

        return $persister->count($criteria);

    }

    /**

     * {@inheritdoc}

    /**

     * {@inheritdoc}

     */

    public function slice(PersistentCollection $collection, $offset, $length = null)

    {

        $mapping   = $collection->getMapping();

        $persister = $this->uow->getEntityPersister($mapping['targetEntity']);

        return $persister->getOneToManyCollection($mapping, $collection->getOwner(), $offset, $length);

    }

    /**

     * {@inheritdoc}