fix: 좋아요 수 오류 수정

prothsync/src/main/java/com/prothsync/prothsync/repository/impl/PostRepositoryImpl.java

@@ -78,4 +78,14 @@ public List<Post> findAllByIds(List<Long> postIds) {
     public void incrementViewCount(Long postId, int delta){
         postJpaRepository.incrementViewCount(postId,delta);
     }
+
+    @Override
+    public void incrementLikeCount(Long postId){
+        postJpaRepository.incrementLikeCount(postId);
+    }
+
+    @Override
+    public void decrementLikeCount(Long postId){
+        postJpaRepository.decrementLikeCount(postId);
+    }
 }

prothsync/src/main/java/com/prothsync/prothsync/repository/jpa/PostJpaRepository.java

@@ -42,4 +42,12 @@ Page<Post> findAllByHashtagIdAndVisibilityPublic(
     @Modifying
     @Query("UPDATE Post p SET p.viewCount = p.viewCount + :delta WHERE p.postId = :postId")
     void incrementViewCount(@Param("postId") Long postId, @Param("delta") int delta);
+
+    @Modifying
+    @Query("UPDATE Post p Set p.likeCount = p.likeCount + 1 WHERE p.postId = :postId")
+    void incrementLikeCount(@Param("postId") Long postId);
+
+    @Modifying
+    @Query("UPDATE Post p SET p.likeCount = p.likeCount - 1 WHERE p.postId = :postId AND p.likeCount > 0")
+    void decrementLikeCount(@Param("postId") Long postId);
 }

prothsync/src/main/java/com/prothsync/prothsync/repository/repository/PostRepository.java

@@ -29,4 +29,7 @@ public interface PostRepository {
     List<Post> findAllByIds(List<Long> postIds);
 
     void incrementViewCount(Long postId, int delta);
+
+    void incrementLikeCount(Long postId);
+    void decrementLikeCount(Long postId);
 }

prothsync/src/main/java/com/prothsync/prothsync/service/LikeService.java

@@ -31,20 +31,18 @@ public LikeResponseDTO toggleLike(Long postId, Long userId) {
 
         if (existingLike.isPresent()) {
             postLikeRepository.delete(existingLike.get());
-            post.decrementLikeCount();
-            postRepository.save(post);
-            return LikeResponseDTO.of(postId, false, post.getLikeCount());
+            postRepository.decrementLikeCount(postId);
+            return LikeResponseDTO.of(postId, false, post.getLikeCount() - 1);
         } else {
             blockService.validateNotBlocked(userId, post.getUserId());
             PostLike postLike = PostLike.create(userId, postId);
             postLikeRepository.save(postLike);
-            post.incrementLikeCount();
-            postRepository.save(post);
+            postRepository.incrementLikeCount(postId);
 
             notificationService.send(
-                NotificationType.LIKE,userId,post.getUserId(),postId, ReferenceType.POST
+                NotificationType.LIKE, userId, post.getUserId(), postId, ReferenceType.POST
             );
-            return LikeResponseDTO.of(postId, true, post.getLikeCount());
+            return LikeResponseDTO.of(postId, true, post.getLikeCount() + 1);
         }
     }