Prevent deleting amenities used by room types

src/main/kotlin/com/android/trisolarisserver/controller/RoomAmenities.kt

@@ -5,6 +5,7 @@ import com.android.trisolarisserver.controller.dto.AmenityUpsertRequest
 import com.android.trisolarisserver.models.room.RoomAmenity
 import com.android.trisolarisserver.repo.AppUserRepo
 import com.android.trisolarisserver.repo.RoomAmenityRepo
+import com.android.trisolarisserver.repo.RoomTypeRepo
 import com.android.trisolarisserver.security.MyPrincipal
 import org.springframework.http.HttpStatus
 import org.springframework.security.core.annotation.AuthenticationPrincipal
@@ -24,6 +25,7 @@ import java.util.UUID
 @RequestMapping("/amenities")
 class RoomAmenities(
     private val roomAmenityRepo: RoomAmenityRepo,
+    private val roomTypeRepo: RoomTypeRepo,
     private val appUserRepo: AppUserRepo
 ) {
 
@@ -86,6 +88,9 @@ class RoomAmenities(
         val amenity = roomAmenityRepo.findById(amenityId).orElse(null)
             ?: throw ResponseStatusException(HttpStatus.NOT_FOUND, "Amenity not found")
 
+        if (roomTypeRepo.existsByAmenitiesId(amenityId)) {
+            throw ResponseStatusException(HttpStatus.CONFLICT, "Amenity is used by room types")
+        }
         roomAmenityRepo.delete(amenity)
     }
 

src/main/kotlin/com/android/trisolarisserver/repo/RoomTypeRepo.kt

@@ -13,4 +13,5 @@ interface RoomTypeRepo : JpaRepository<RoomType, UUID> {
     fun findByPropertyIdOrderByCode(propertyId: UUID): List<RoomType>
     fun existsByPropertyIdAndCode(propertyId: UUID, code: String): Boolean
     fun existsByPropertyIdAndCodeAndIdNot(propertyId: UUID, code: String, id: UUID): Boolean
+    fun existsByAmenitiesId(id: UUID): Boolean
 }