Merge pull request #835 from woowacourse-teams/refactor/#833

인기순 전체 게시글 목록 조회 기능의 성능 개선을 위한 QueryDsl 코드 수정
woowacourse-teams · Nov 7, 2023 · f1dc85b · f1dc85b
2 parents 1d3a5e1 + 8d08f39
commit f1dc85b
Showing 1 changed file with 10 additions and 3 deletions.
diff --git a/backend/src/main/java/com/votogether/domain/post/repository/PostCustomRepositoryImpl.java b/backend/src/main/java/com/votogether/domain/post/repository/PostCustomRepositoryImpl.java
@@ -51,10 +51,9 @@ public List<Post> findPostsWithFilteringAndPaging(
             final Long categoryId,
             final Pageable pageable
     ) {
-        return jpaQueryFactory
-                .selectDistinct(post)
+        List<Long> postIds = jpaQueryFactory
+                .select(post.id)
                 .from(post)
-                .join(post.writer).fetchJoin()
                 .leftJoin(post.postCategories, postCategory)
                 .where(
                         categoryIdEq(categoryId),
@@ -65,6 +64,14 @@ public List<Post> findPostsWithFilteringAndPaging(
                 .offset(pageable.getOffset())
                 .limit(pageable.getPageSize())
                 .fetch();
+
+        return jpaQueryFactory
+                .selectDistinct(post)
+                .from(post)
+                .join(post.writer).fetchJoin()
+                .where(post.id.in(postIds))
+                .orderBy(orderBy(postSortType))
+                .fetch();
     }
 
     private BooleanExpression categoryIdEq(final Long categoryId) {