(TP-123) feat: add renter rents his own property check

Author: Kattsyn

rentplace/src/main/java/kattsyn/dev/rentplace/services/impl/ReservationServiceImpl.java

@@ -88,6 +88,12 @@ public ReservationDTO getReservationDTOById(long reservationId) {
     @Transactional
     public ReservationDTO createReservation(ReservationCreateEditDTO reservationCreateEditDTO) {
         Reservation reservation = reservationMapper.fromReservationCreateEditDTO(reservationCreateEditDTO);
+
+        if (reservation.getRenter().getUserId() == reservation.getProperty().getOwner().getUserId()) {
+            throw new ValidationException(String.format("Owner id: %s can't rent his own property id: %s",
+                    reservationCreateEditDTO.getRenterId(), reservationCreateEditDTO.getPropertyId()));
+        }
+
         setPrices(reservation);
         reservation.setPaymentStatus(PaymentStatus.NOT_PAID);