/**
  * @param JobNursery      $jobNursery
  * @param ArrayCollection $originalPeriods
  * @param bool            $flush
  */
 public function cleanPeriods(JobNursery $jobNursery, ArrayCollection $originalPeriods, $flush = true)
 {
     foreach ($originalPeriods as $period) {
         if (false === $jobNursery->getPeriods()->contains($period)) {
             $this->manager->remove($period);
         }
     }
     if ($flush) {
         $this->manager->flush();
     }
 }