feat: performance improvements

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -35,6 +35,9 @@ use App\Service\ServiceAvailabilityCalculator;
  */
 class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
 {
+    /** @var array<string, array<string, mixed>> Request-scoped cache for field options */
+    private array $optionsCache = [];
+
     /**
      * Initializes the provider with required dependencies.
      *
@@ -57,6 +60,39 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
         parent::__construct();
     }
 
+    /**
+     * Retrieves form field options with request-scoped caching.
+     *
+     * Overrides parent to add instance-level caching, preventing redundant
+     * field option calculations when the same field is accessed multiple times
+     * during form building (happens ~16 times per participant × 50 participants = 800 calls).
+     *
+     * Cache key includes: field name, participant index, mode, and date of birth.
+     * The cache is automatically cleared between requests since the service is request-scoped.
+     *
+     * @param string     $fieldName        The name of the field to configure
+     * @param BookingDto $bookingDto       The current booking data for context
+     * @param int        $participantIndex The index of the participant being configured
+     * @param array      $options          Additional options to customize field behavior
+     *
+     * @return array<string, mixed> Symfony form field options, or empty array if field not supported
+     */
+    public function getFieldOptions(string $fieldName, BookingDto $bookingDto, int $participantIndex, array $options = []): array
+    {
+        // Generate cache key based on factors that affect field options
+        $participant = $bookingDto->getParticipant($participantIndex);
+        $cacheKey = sprintf(
+            '%s_%d_%s_%s',
+            $fieldName,
+            $participantIndex,
+            $bookingDto->getMode(),
+            $participant?->dateOfBirth?->format('Y-m-d') ?? 'no_dob'
+        );
+
+        // Return cached result if available, otherwise compute and cache
+        return $this->optionsCache[$cacheKey] ??= parent::getFieldOptions($fieldName, $bookingDto, $participantIndex, $options);
+    }
+
     /**
      * Registers all field option providers during service initialization.
      *