gistfile1.php

$campsite = $campsiteRepo->find(100011);
$ranking = $campsite->getRanking();

$ranking = $rankingRepo->findOneBy(['campsite' => 100011]);
$campsite = $ranking->getCampsite();

ranking fixture

<?php
/**
* RankingLoader
*
* @category  CampsiteRankingFixture
* @package   CampsiteRankingFixture
* @copyright 2014 ACSI Holding bv (http://www.acsi.eu)
* @version   SVN: $Id$
*/

namespace CampsiteRankingFixture;

use AcsiCampsite\Entity\Ranking;
use Doctrine\Common\DataFixtures\AbstractFixture;
use Doctrine\Common\DataFixtures\DependentFixtureInterface;
use Doctrine\Common\Persistence\ObjectManager;

class RankingLoader extends AbstractFixture implements DependentFixtureInterface
{
    /**
     * @param ObjectManager $manager
     */
    public function load(ObjectManager $manager)
    {
        $ranking = new Ranking();

        $ranking->setCampsite($this->getReference('campsite-100000'));
        $ranking->setRankEurocampings(3);
        $ranking->setRankCca(4);
        $ranking->setIsCampsiteOfTheWeek(true);
        $ranking->setIsThemeTopCca(false);
        $ranking->setIsThemeTopEurocampings(false);
        $ranking->setPercentageClicksConsumed(20);

        $this->addReference('ranking-1', $ranking);

        $manager->persist($ranking);
        $manager->flush();
    }

    /**
     * This method must return an array of fixtures classes
     * on which the implementing class depends on
     *
     * @return array
     */
    function getDependencies()
    {
        return['CampsiteDetailsFixture\CampsiteDetailsLoader'];
    }
}