Sulu\Bundle\ContactBundle\Contact\AbstractContactManager::setMainEmail PHP Метод

    public function setMainEmail($entity)
    {
        // set main to first entry or to null
        if ($entity->getEmails()->isEmpty()) {
            $entity->setMainEmail(null);
        } else {
            $entity->setMainEmail($entity->getEmails()->first()->getEmail());
        }
    }