Merge pull request #199 from SSASINSA/refactor/193_sprint_fix

refactor: 행사 옵션 수정시 신청 제거 (#193)

Author: seungsang2000

src/main/java/com/ssasinsa/wearagain/domain/event/repository/EventApplicationRepository.java

@@ -142,6 +142,8 @@ List<Long> findApplicationIdsForUser(
 
     long countByEvent_IdAndStatusIn(Long eventId, Collection<EventApplicationStatus> statuses);
 
+    long countByEventOption_IdIn(Collection<Long> optionIds);
+
     @Query("""
             select ea.checkedInAt
             from EventApplication ea

src/main/java/com/ssasinsa/wearagain/domain/event/service/EventAdminServiceImpl.java

@@ -77,8 +77,10 @@
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 @Service
+@Slf4j
 @RequiredArgsConstructor
 public class EventAdminServiceImpl implements EventAdminService {
 
@@ -332,6 +334,7 @@ public EventAdminDetailResponse updateEvent(Long eventId, EventAdminUpdateReques
 
         if (request.options() != null) {
             validateOptionDepthStructureForRequests(targetOptionDepth, request.options());
+            logCascadeDeletion(event);
             List<EventOption> options = buildEventOptions(event, request.options());
             event.assignOptions(options);
         } else if (request.optionDepth() != null) {
@@ -1085,6 +1088,17 @@ private Set<Long> collectOptionIds(Collection<EventOption> roots) {
         return ids;
     }
 
+    private void logCascadeDeletion(Event event) {
+        Set<Long> existingOptionIds = collectOptionIds(event.getOptions());
+        if (existingOptionIds.isEmpty()) {
+            return;
+        }
+        long affected = eventApplicationRepository.countByEventOption_IdIn(existingOptionIds);
+        if (affected > 0) {
+            log.warn("행사 {} 옵션 재구성으로 신청 {}건이 삭제됩니다.", event.getId(), affected);
+        }
+    }
+
     private Integer safeToInteger(long value) {
         if (value > Integer.MAX_VALUE) {
             return Integer.MAX_VALUE;

src/main/resources/db/migration/V20251217__cascade_delete_event_application_on_option.sql

@@ -0,0 +1,8 @@
+-- 행사 옵션 삭제 시 연결된 신청까지 함께 제거되도록 FK를 재정의한다.
+ALTER TABLE event_applications
+    DROP FOREIGN KEY FKmcvrh0u6bxk36ka5lrsw3n1rw;
+
+ALTER TABLE event_applications
+    ADD CONSTRAINT FKmcvrh0u6bxk36ka5lrsw3n1rw
+        FOREIGN KEY (event_option_id) REFERENCES event_option (event_option_id)
+        ON DELETE CASCADE;