feat: reduce session payload

src/Form/Model/BookingDto.php

@@ -325,4 +325,62 @@ class BookingDto
     {
         return AgencyLoader::INTERNAL_AGENCY_CODE === $this->agencyCode;
     }
+
+    /**
+     * Controls session serialization to exclude the heavy Travel object graph.
+     *
+     * Replaces the full Travel object with just its integer ID. The Booking's
+     * travelData reference is also removed since it points to the same object.
+     * BookingService::hydrate() restores the Travel from cache after session read.
+     *
+     * @return array<string, mixed>
+     */
+    public function __serialize(): array
+    {
+        $data = get_object_vars($this);
+
+        // Replace the full Travel object graph with just its ID
+        $data['travel'] = $this->travel->id;
+
+        // Clone Booking to avoid mutating the live object, then strip its
+        // travelData reference which points to the same heavy Travel graph
+        if (null !== $this->booking) {
+            $booking = clone $this->booking;
+            $booking->travelData = null;
+            $data['booking'] = $booking;
+        }
+
+        return $data;
+    }
+
+    /**
+     * Restores the DTO from session data with a minimal Travel placeholder.
+     *
+     * Creates a Travel object containing only the ID. BookingService::hydrate()
+     * replaces this with the full Travel from cache on every session read.
+     *
+     * @param array<string, mixed> $data
+     */
+    public function __unserialize(array $data): void
+    {
+        // Extract the travel ID before the property loop — 'travel' in the
+        // serialized data is an int, not a Travel object
+        $travelId = $data['travel'];
+        unset($data['travel']);
+
+        // Skip keys that no longer exist as declared properties to avoid
+        // dynamic property creation (deprecated since PHP 8.2)
+        foreach ($data as $key => $value) {
+            if (false === property_exists($this, $key)) {
+                continue;
+            }
+            $this->$key = $value;
+        }
+
+        // Create a skeleton Travel with only the ID; BookingService::hydrate()
+        // replaces this with the full object from cache
+        $travel = new Travel();
+        $travel->id = $travelId;
+        $this->travel = $travel;
+    }
 }

src/Service/BookingService.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Service;
 
 use App\BusProNet\Constants;
@@ -80,14 +82,12 @@ class BookingService
      */
     public function getOrCreateBookingCreateDto(Request $request): BookingDto
     {
-        $bookingCreateDto = $request->getSession()->get(self::BOOKING_CREATE_KEY);
+        $bookingDto = $this->getBookingDto($request, BookingDto::MODE_CREATE);
 
-        // Return existing DTO from session if available
-        if (null !== $bookingCreateDto) {
-            return $bookingCreateDto;
+        if (null !== $bookingDto) {
+            return $bookingDto;
         }
 
-        // No session found - user must go through proper init flow
         throw new BookingSessionNotFoundException();
     }
 
@@ -105,12 +105,15 @@ class BookingService
     }
 
     /**
-     * Retrieves the booking DTO from the session.
+     * Retrieves the booking DTO from the session and restores the Travel object.
+     *
+     * After deserialization the DTO contains only a Travel skeleton with the ID.
+     * This method replaces it with the full Travel from cache via hydrate().
      *
      * @param Request $request The HTTP request containing session data
      * @param string  $mode    The booking mode (create/edit)
      *
-     * @return BookingDto|null The booking DTO from session or null if not found
+     * @return BookingDto|null The booking DTO or null if not found
      */
     public function getBookingDto(Request $request, string $mode): ?BookingDto
     {
@@ -121,7 +124,10 @@ class BookingService
             return null;
         }
 
-        return $session->get($sessionKey);
+        $bookingDto = $session->get($sessionKey);
+        $this->hydrate($bookingDto);
+
+        return $bookingDto;
     }
 
     /**
@@ -148,6 +154,31 @@ class BookingService
         return BookingDto::MODE_EDIT === $mode ? self::BOOKING_EDIT_KEY : self::BOOKING_CREATE_KEY;
     }
 
+    /**
+     * Restores the full Travel object from cache after session deserialization.
+     *
+     * BookingDto::__serialize() replaces Travel with just its ID to keep session
+     * payloads small. This method fetches the complete Travel from the
+     * TravelDataService cache and sets it on both the DTO and the Booking reference.
+     */
+    private function hydrate(BookingDto $bookingDto): void
+    {
+        $travel = $this->travelDataService->getTravelData(
+            $bookingDto->travel->id,
+            $bookingDto->hotelId
+        );
+
+        if (null === $travel) {
+            return;
+        }
+
+        $bookingDto->travel = $travel;
+
+        if (null !== $bookingDto->booking) {
+            $bookingDto->booking->travelData = $travel;
+        }
+    }
+
     /**
      * Clears all booking-related session data.
      *