Symfony\Bridge\Doctrine\Form\ChoiceList\EntityChoiceList::getEntity PHP Method

    public function getEntity($key)
    {
        if (!$this->loaded) {
            $this->load();
        }

        try {
            if (count($this->identifier) > 1) {
                // $key is a collection index
                $entities = $this->getEntities();

                return isset($entities[$key]) ? $entities[$key] : null;
            } else if ($this->entities) {
                return isset($this->entities[$key]) ? $this->entities[$key] : null;
            } else if ($qb = $this->queryBuilder) {
                // should we clone the builder?
                $alias = $qb->getRootAlias();
                $where = $qb->expr()->eq($alias.'.'.current($this->identifier), $key);

                return $qb->andWhere($where)->getQuery()->getSingleResult();
            }

            return $this->em->find($this->class, $key);
        } catch (NoResultException $e) {
            return null;
        }
    }