fix: переделал sql запрос к бд на поиск last и next booking

src/main/java/ru/practicum/shareit/booking/BookingRepository.java

@@ -34,18 +34,22 @@ public interface BookingRepository extends JpaRepository<Booking, Long>, Queryds
     Optional<Booking> findByItemNextBooking(Long itemId, LocalDateTime now);
 
     @Query(value = """
-            select b from Booking as b where b.item.id in ?1
-            and b.status='APPROVED'
-            and b.startTime < ?2
-            order by b.startTime desc
+            select b from Booking as b
+            join(select b.item.id as item, max(b.startTime) as firstStartTime
+            from Booking as b
+            where b.startTime < ?2 and b.status='APPROVED'
+            group by b.item.id) as subquery on b.item.id=subquery.item and b.startTime = subquery.firstStartTime
+            where b.item.id in ?1
             """)
     List<Booking> findAllByItemsLastBooking(List<Long> itemIds, LocalDateTime now);
 
     @Query(value = """
-            select b from Booking as b where b.item.id in ?1
-            and b.status='APPROVED'
-            and b.startTime > ?2
-            order by b.startTime asc
+            select b from Booking as b
+            join(select b.item.id as item, min(b.startTime) as firstStartTime
+            from Booking as b
+            where b.startTime > ?2 and b.status='APPROVED'
+            group by b.item.id) as subquery on b.item.id=subquery.item and b.startTime = subquery.firstStartTime
+            where b.item.id in ?1
             """)
     List<Booking> findAllByItemsNextBooking(List<Long> itemIds, LocalDateTime now);
 

src/main/java/ru/practicum/shareit/item/service/ItemServiceImpl.java

@@ -90,23 +90,17 @@ public List<ItemInfoDto> getAllOfOwner(Long userId) {
                 .findAllByItemsLastBooking(new ArrayList<>(itemMap.keySet()), LocalDateTime.now());
         List<Booking> nextBookings = bookingRepository
                 .findAllByItemsNextBooking(new ArrayList<>(itemMap.keySet()), LocalDateTime.now());
-        Map<Long, List<Booking>> lastBookingsByItem = lastBookings.stream()
-                .collect(Collectors.groupingBy(booking -> booking.getItem().getId()));
-        Map<Long, List<Booking>> nextBookingsByItem = nextBookings.stream()
-                .collect(Collectors.groupingBy(booking -> booking.getItem().getId()));
-        Map<Long, Booking> lastBookingByItem = lastBookingsByItem.keySet().stream()
-                .map(id -> lastBookingsByItem.get(id).getFirst())
-                .collect(Collectors.toMap(booking -> booking.getItem().getId(), item -> item));
-        Map<Long, Booking> nextBookingByItem = nextBookingsByItem.keySet().stream()
-                .map(id -> nextBookingsByItem.get(id).getFirst())
-                .collect(Collectors.toMap(booking -> booking.getItem().getId(), item -> item));
+        Map<Long, Booking> next = nextBookings.stream()
+                .collect(Collectors.toMap(booking -> booking.getItem().getId(), booking -> booking));
+        Map<Long, Booking> last = lastBookings.stream()
+                .collect(Collectors.toMap(booking -> booking.getItem().getId(), booking -> booking));
         List<Comment> comments = commentRepository.findAllByItemIdIn(new ArrayList<>(itemMap.keySet()));
         Map<Long, List<Comment>> commentsByItem = comments.stream()
                 .collect(Collectors.groupingBy(comment -> comment.getItem().getId()));
         return itemMap.keySet().stream()
                 .map(id -> itemMapper.toInfoDto(itemMap.get(id),
-                        lastBookingByItem.get(id),
-                        nextBookingByItem.get(id),
+                        last.get(id),
+                        next.get(id),
                         commentsByItem.get(id)))
                 .toList();
     }