Sulu\Bundle\ContactBundle\Entity\AccountInterface::setMainFax PHP Method

    public function setMainFax($mainFax);

 /**
  * sets Entity's Main-Fax.
  *
  * @param Contact|AccountInterface $entity
  */
 public function setMainFax($entity)
 {
     // set main to first entry or to null
     if ($entity->getFaxes()->isEmpty()) {
         $entity->setMainFax(null);
     } else {
         $entity->setMainFax($entity->getFaxes()->first()->getFax());
     }
 }