Feat: Add repository method to fetch filter options

src/Repository/AssignmentRepository.php

@@ -60,4 +60,52 @@ class AssignmentRepository extends ServiceEntityRepository
 
         return $qb->getQuery();
     }
+
+    public function getFilterOptions(): array
+    {
+        $options = [];
+
+        // Date range
+        $qb = $this->createQueryBuilder('assignment');
+        $result = $qb
+            ->select('MIN(destination.dateFrom) minDate', 'MAX(destination.dateTo) maxDate')
+            ->innerJoin('assignment.destination', 'destination')
+            ->getQuery()
+            ->getSingleResult()
+        ;
+
+        $options['minDate'] = $result['minDate'];
+        $options['maxDate'] = $result['maxDate'];
+
+        // Job-profiles
+        $qb = $this->createQueryBuilder('assignment');
+        $result = $qb
+            ->select('job_profile.id', 'job_profile.name')
+            ->innerJoin('assignment.jobProfile', 'job_profile')
+            ->orderBy('job_profile.name', 'ASC')
+            ->getQuery()
+            ->getArrayResult()
+        ;
+
+        foreach ($result as $row) {
+            $options['jobProfiles'][$row['id']] = $row['name'];
+        }
+
+        // Products
+        $qb = $this->createQueryBuilder('assignment');
+        $result = $qb
+            ->select('destination.id id', 'destination.product product', 'destination.hotel hotel')
+            ->innerJoin('assignment.destination', 'destination')
+            ->orderBy('destination.product', 'ASC')
+            ->groupBy('destination.id')
+            ->getQuery()
+            ->getArrayResult()
+        ;
+
+        foreach ($result as $row) {
+            $options['products'][$row['id']] = $row['product'];
+        }
+
+        return $options;
+    }
 }