save freight order ids on carrier

src/FreightOrder/UseCases/CreateFreightOrder.php

@@ -2,6 +2,7 @@
 
 namespace FreightQuote\FreightOrder\UseCases;
 
+use FreightQuote\Carrier\CarrierRepository;
 use FreightQuote\FreightOrder\FreightOrderRepository;
 use FreightQuote\FreightOrder\FreightOrder;
 
@@ -9,10 +10,36 @@ class CreateFreightOrder
 {
     public function __construct(
         private FreightOrderRepository $freightOrderRepo,
+        private CarrierRepository $carrierRepo,
     ) {}
 
     public function execute(
         CreateFreightOrderRequestDTO $dto,
+    ): FreightOrder {
+        $savedFreightOrder = $this->constructFreightOrder($dto);
+        foreach ($dto->carrierIds as $carrierId) {
+            $this->updateCarrier(
+                $carrierId,
+                $savedFreightOrder->getId()
+            );
+        }
+
+        return $savedFreightOrder;
+    }
+
+    private function updateCarrier(
+        int $carrierId,
+        int $freightOrderId
+    ): void {
+        $carrier = $this->carrierRepo->find($carrierId);
+        $carrierFreightOrderIds = $carrier->getFreightOrderIds();
+        $carrierFreightOrderIds[] = $freightOrderId;
+        $carrier->setFreightOrderIds($carrierFreightOrderIds);
+        $this->carrierRepo->save($carrier);
+    }
+
+    private function constructFreightOrder(
+        CreateFreightOrderRequestDTO $dto,
     ): FreightOrder {
         return $this->freightOrderRepo->save(
             new FreightOrder(