Merge pull request #239 from prgrms-web-devcourse-final-project/refactor/EA3-191-study-extension-return-id

[EA3-191] refactor: 스터디 연장 반환값 변경

Author: endorsement0912

src/main/java/grep/neogulcoder/domain/study/controller/StudyManagementController.java

@@ -49,11 +49,11 @@ public ApiResponse<Void> delegateLeader(@PathVariable("studyId") Long studyId,
     }
 
     @PostMapping("/extension")
-    public ApiResponse<Void> extendStudy(@PathVariable("studyId") Long studyId,
+    public ApiResponse<Long> extendStudy(@PathVariable("studyId") Long studyId,
                                          @RequestBody @Valid ExtendStudyRequest request,
                                          @AuthenticationPrincipal Principal userDetails) {
-        studyManagementService.extendStudy(studyId, request, userDetails.getUserId());
-        return ApiResponse.noContent();
+        Long extendStudyId = studyManagementService.extendStudy(studyId, request, userDetails.getUserId());
+        return ApiResponse.success(extendStudyId);
     }
 
     @PostMapping("/extension/participations")

src/main/java/grep/neogulcoder/domain/study/controller/StudyManagementSpecification.java

@@ -27,7 +27,7 @@ public interface StudyManagementSpecification {
     ApiResponse<Void> delegateLeader(Long studyId, DelegateLeaderRequest request, Principal userDetails);
 
     @Operation(summary = "스터디 연장", description = "스터디장이 스터디를 연장합니다.")
-    ApiResponse<Void> extendStudy(Long studyId, ExtendStudyRequest request, Principal userDetails);
+    ApiResponse<Long> extendStudy(Long studyId, ExtendStudyRequest request, Principal userDetails);
 
     @Operation(summary = "연장 스터디 참여", description = "스터디원이 연장된 스터디에 참여합니다.")
     ApiResponse<Void> registerExtensionParticipation(Long studyId, Principal userDetails);

src/main/java/grep/neogulcoder/domain/study/service/StudyManagementService.java

@@ -120,7 +120,7 @@ public void deleteUserFromStudies(Long userId) {
     }
 
     @Transactional
-    public void extendStudy(Long studyId, ExtendStudyRequest request, Long userId) {
+    public Long extendStudy(Long studyId, ExtendStudyRequest request, Long userId) {
         Study originStudy = findValidStudy(studyId);
 
         StudyMember leader = findValidStudyMember(studyId, userId);
@@ -141,6 +141,8 @@ public void extendStudy(Long studyId, ExtendStudyRequest request, Long userId) {
         studyMemberRepository.save(extendedLeader);
 
         eventPublisher.publishEvent(new StudyExtendEvent(originStudy.getId()));
+
+        return extendedStudy.getId();
     }
 
     @Transactional