vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/OneToManyPersister.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Persisters;

use Doctrine\ORM\PersistentCollection;
use Doctrine\ORM\UnitOfWork;

/**
 * Persister for one-to-many collections.
 *
 * @author  Roman Borschel <roman@code-factory.org>
 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author  Alexander <iam.asm89@gmail.com>
 * @since   2.0
 */
class OneToManyPersister extends AbstractCollectionPersister
{
    /**
     * {@inheritdoc}
     *
     * @override
     */
    public function get(PersistentCollection $coll, $index)
    {
        $mapping   = $coll->getMapping();
        $uow       = $this->em->getUnitOfWork();
        $persister = $uow->getEntityPersister($mapping['targetEntity']);

        if (!isset($mapping['indexBy'])) {
            throw new \BadMethodCallException("Selecting a collection by index is only supported on indexed collections.");
        }

        return $persister->load(array($mapping['mappedBy'] => $coll->getOwner(), $mapping['indexBy'] => $index), null, null, array(), 0, 1);
    }

    /**
     * Generates the SQL UPDATE that updates a particular row's foreign
     * key to null.
     *
     * @param \Doctrine\ORM\PersistentCollection $coll
     *
     * @return string
     *