refactor: add return value

- fix add unique constraint on tables

src/main/java/gymmi/photoboard/controller/PhotoBoardController.java

@@ -6,6 +6,7 @@
 import gymmi.photoboard.response.PhotoFeedDetailResponse;
 import gymmi.photoboard.response.PhotoFeedResponse;
 import gymmi.photoboard.service.PhotoFeedService;
+import gymmi.response.IdResponse;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
@@ -20,12 +21,12 @@ public class PhotoBoardController {
     private final PhotoFeedService photoFeedService;
 
     @PostMapping("/photos")
-    public ResponseEntity<Void> createPhotoFeed(
+    public ResponseEntity<IdResponse> createPhotoFeed(
             @Logined User user,
             @Validated @RequestBody CreatePhotoFeedRequest request
     ) {
-        photoFeedService.createPhotoFeed(user, request);
-        return ResponseEntity.ok().build();
+        Long id = photoFeedService.createPhotoFeed(user, request);
+        return ResponseEntity.ok().body(new IdResponse(id));
     }
 
     @GetMapping("/photos/{photoId}")

src/main/java/gymmi/photoboard/service/PhotoFeedService.java

@@ -33,12 +33,13 @@ public class PhotoFeedService {
     private final ThumbsUpRepository thumbsUpRepository;
 
     @Transactional
-    public void createPhotoFeed(User loginedUser, CreatePhotoFeedRequest request) {
+    public Long createPhotoFeed(User loginedUser, CreatePhotoFeedRequest request) {
         PhotoFeed photoFeed = new PhotoFeed(loginedUser, request.getComment());
         PhotoFeedImage photoFeedImage = new PhotoFeedImage(photoFeed, request.getFilename());
         s3Service.checkObjectExist(PhotoFeedImage.IMAGE_USE, photoFeedImage.getFilename());
-        photoFeedRepository.save(photoFeed);
+        PhotoFeed savedPhotoFeed = photoFeedRepository.save(photoFeed);
         photoFeedImageRepository.save(photoFeedImage);
+        return savedPhotoFeed.getId();
     }
 
     @Transactional(readOnly = true)