[#14] feat : 나라별 예약 최저가격 순으로 조회

Author: mmihye

skyscanner/src/main/java/org/third/thirdseminar/domain/ReservationMinPriceDTO.java

@@ -0,0 +1,12 @@
+package org.third.thirdseminar.domain;
+
+
+public record ReservationMinPriceDTO (
+    Reservation reservation,
+    Long minPrice
+){
+    public static ReservationMinPriceDTO of(Reservation reservation,Long minPrice) {
+        return new ReservationMinPriceDTO(reservation, minPrice);
+    }
+
+}

skyscanner/src/main/java/org/third/thirdseminar/infrastructure/ReservationJpaRepository.java

@@ -3,13 +3,23 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
+import org.third.thirdseminar.controller.dto.response.AirDto;
 import org.third.thirdseminar.domain.Reservation;
+import org.third.thirdseminar.domain.ReservationMinPriceDTO;
 
 import java.util.List;
+import java.util.Map;
+import java.util.Objects;
 
 public interface ReservationJpaRepository extends JpaRepository<Reservation, Long> {
 	@Query("SELECT r FROM Reservation r WHERE r.cityName <> :cityName")
 	List<Reservation> findAllExcludingCity(@Param("cityName") String cityName);
 
 	Reservation findByAir_AirId(@Param("airId") Long airId);
+
+
+	@Query("SELECT r, MIN(t.price) FROM Reservation r JOIN r.tickets t WHERE r.country = :country GROUP BY r ORDER BY MIN(t.price) ASC")
+	List<Object[]> findReservations(@Param("country") String country);
+
+
 }

skyscanner/src/main/java/org/third/thirdseminar/service/ReservationService.java

@@ -11,10 +11,7 @@
 import org.third.thirdseminar.controller.dto.response.TimeRangeDto;
 import org.third.thirdseminar.controller.dto.request.CreateReservationRequest;
 import org.third.thirdseminar.controller.dto.response.*;
-import org.third.thirdseminar.domain.Reservation;
-import org.third.thirdseminar.domain.ReservationResult;
-import org.third.thirdseminar.domain.Ticket;
-import org.third.thirdseminar.domain.TimeRange;
+import org.third.thirdseminar.domain.*;
 import org.third.thirdseminar.infrastructure.ReservationJpaRepository;
 import org.third.thirdseminar.infrastructure.ReservationResultJpaRepository;
 import org.third.thirdseminar.infrastructure.TicketJpaRepository;
@@ -39,12 +36,17 @@ public class ReservationService {
     private final DecimalFormat df = new DecimalFormat("###,###");
 
     public AirReservationResponse getReservations(AirReservationRequest reqeust){
-        List<Reservation> reservations = reservationJpaRepository.findAll();
+        List<ReservationMinPriceDTO> reservationMinPriceDtoList = reservationJpaRepository.findReservations("일본").stream().map(
+                row -> ReservationMinPriceDTO.of(
+                        (Reservation) row[0],
+                        (Long) row[1]
+                )).toList();
+
 
         List<AirDto> airList = new ArrayList<>();
-        for(Reservation reservation : reservations){
-            List<Ticket> ticket= tickectJpaRepository.findByReservationIdOrderByPriceAsc(reservation.getId());
-            airList.add(AirDto.of(reservation, df.format(ticket.get(0).getPrice()), TimeRangeFormat(reservation.getStartTime()), TimeRangeFormat(reservation.getEndTime())));
+        for(ReservationMinPriceDTO reservationMinPriceDTO : reservationMinPriceDtoList){
+            Reservation reservation = reservationMinPriceDTO.reservation();
+            airList.add(AirDto.of(reservation, df.format(reservationMinPriceDTO.minPrice()), TimeRangeFormat(reservation.getStartTime()), TimeRangeFormat(reservation.getEndTime())));
         }
         DateDto dateDto = new DateDto(reqeust.startDate(), reqeust.endDate());
         return new AirReservationResponse(dateDto, airList);