[fix] #170 - 예매자 삭제 시 판매 티켓 수에 반영하는 로직 구현 (#171)

* [#170] feat: 예매자 삭제 관련 에러 메세지 추가

* [#170] feat(Schedule): soldTicketCount 변경 메소드 추가

* [#170] fix(TicketService): 예매자 삭제 시 soldTicketCount에 반영되도록 메소드 수정

* [#170] fix(Schedule): 예매자 삭제 시 exception 처리 방식 수정

src/main/java/com/beat/domain/booking/application/TicketService.java

@@ -9,6 +9,8 @@
 import com.beat.domain.performance.dao.PerformanceRepository;
 import com.beat.domain.performance.domain.Performance;
 import com.beat.domain.performance.exception.PerformanceErrorCode;
+import com.beat.domain.schedule.dao.ScheduleRepository;
+import com.beat.domain.schedule.domain.Schedule;
 import com.beat.domain.schedule.domain.ScheduleNumber;
 import com.beat.domain.booking.exception.BookingErrorCode;
 import com.beat.global.common.exception.ForbiddenException;
@@ -32,6 +34,7 @@ public class TicketService {
     private final PerformanceRepository performanceRepository;
     private final MemberRepository memberRepository;
     private final UserRepository userRepository;
+    private final ScheduleRepository scheduleRepository;
     private final CoolSmsService coolSmsService;
 
     public TicketRetrieveResponse getTickets(Long memberId, Long performanceId, ScheduleNumber scheduleNumber, Boolean isPaymentCompleted) {
@@ -125,6 +128,13 @@ public void deleteTickets(Long memberId, TicketDeleteRequest ticketDeleteRequest
                     .orElseThrow(() -> new NotFoundException(BookingErrorCode.NO_BOOKING_FOUND));
 
             ticketRepository.delete(booking);
+
+            Schedule schedule = booking.getSchedule();
+
+            ticketRepository.delete(booking);
+
+            schedule.decreaseSoldTicketCount(booking.getPurchaseTicketCount());
+            scheduleRepository.save(schedule);
         }
     }
 }

src/main/java/com/beat/domain/schedule/domain/Schedule.java

@@ -1,6 +1,8 @@
 package com.beat.domain.schedule.domain;
 
 import com.beat.domain.performance.domain.Performance;
+import com.beat.domain.schedule.exception.ScheduleErrorCode;
+import com.beat.global.common.exception.ConflictException;
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.EnumType;
@@ -78,4 +80,13 @@ public void update(LocalDateTime performanceDate, int totalTicketCount, Schedule
         this.totalTicketCount = totalTicketCount;
         this.scheduleNumber = scheduleNumber;
     }
+
+    public void decreaseSoldTicketCount(int count) {
+        if (this.soldTicketCount >= count) {
+            this.soldTicketCount -= count;
+        } else {
+            throw new ConflictException(ScheduleErrorCode.EXCESS_TICKET_DELETE);
+        }
+    }
+
 }

src/main/java/com/beat/domain/schedule/exception/ScheduleErrorCode.java

@@ -9,7 +9,8 @@
 public enum ScheduleErrorCode implements BaseErrorCode {
     INVALID_DATA_FORMAT(400, "잘못된 데이터 형식입니다."),
     NO_SCHEDULE_FOUND(404, "해당 회차를 찾을 수 없습니다."),
-    INSUFFICIENT_TICKETS(409, "요청한 티켓 수량이 잔여 티켓 수를 초과했습니다. 다른 수량을 선택해 주세요.")
+    INSUFFICIENT_TICKETS(409, "요청한 티켓 수량이 잔여 티켓 수를 초과했습니다. 다른 수량을 선택해 주세요."),
+    EXCESS_TICKET_DELETE(409, "예매된 티켓 수 이상을 삭제할 수 없습니다.")
     ;
 
     private final int status;