public function setInventoryAudit(InventoryAudit $inventoryAudit) { if ($inventoryAudit === null) { $this->inventoryAudit = null; $inventoryAudit->removeInventoryTravelerIdAudit($this); } else { $this->inventoryAudit = $inventoryAudit; $inventoryAudit->addInventoryTravelerIdAudit($this); } return $this; }