[FIX] feed에 연결된 novel이 null일 때 발생하는 NPE 해결

src/main/java/org/websoso/WSSServer/dto/feed/UserFeedGetResponse.java

@@ -44,8 +44,10 @@ public static UserFeedGetResponse of(Feed feed, Novel novel, Long visitorId) {
  isLiked,
  feed.getLikes().size(),
  feed.getComments().size(),
- novel.getNovelId(),
- novel.getTitle(),
+ novel == null ?
+ null : novel.getNovelId(),
+ novel == null ?
+ null : novel.getTitle(),
  novelRating,
  novelRatingCount,
  relevantCategories
@@ -69,21 +71,31 @@ private static List<Long> getLikeUsers(Feed feed) {
  }
 
  private static Long getNovelRatingCount(Novel novel) {
+ if (novel == null) {
+ return null;
+ }
  return novel.getUserNovels()
  .stream()
  .filter(userNovel -> userNovel.getUserNovelRating() != 0.0f)
  .count();
  }
 
  private static Float getNovelRatingSum(Novel novel) {
+ if (novel == null) {
+ return null;
+ }
+
  return (float) novel.getUserNovels()
  .stream()
  .filter(userNovel -> userNovel.getUserNovelRating() != 0.0f)
  .mapToDouble(UserNovel::getUserNovelRating)
  .sum();
  }
 
- private static float getNovelRating(Novel novel, Long novelRatingCount) {
+ private static Float getNovelRating(Novel novel, Long novelRatingCount) {
+ if (novel == null) {
+ return null;
+ }
  return novelRatingCount > 0
  ? getNovelRatingSum(novel) / novelRatingCount
  : 0.0f;