feat: recent post 커서페이징 적용

Author: cse0518

src/main/java/org/ahpuh/surf/post/controller/PostController.java

@@ -150,10 +150,11 @@ public ResponseEntity<Integer> getAllPostByCategory(
     }
 
     @GetMapping("/posts/recent")
-    public ResponseEntity<List<RecentPostDto>> recentAllPosts(
-            @AuthenticationPrincipal final JwtAuthentication authentication
+    public ResponseEntity<CursorResult<RecentPostDto>> recentAllPosts(
+            @AuthenticationPrincipal final JwtAuthentication authentication,
+            @RequestParam final Long cursorId
     ) {
-        final List<RecentPostDto> recentAllPosts = postService.recentAllPosts(authentication.userId);
+        final CursorResult<RecentPostDto> recentAllPosts = postService.recentAllPosts(authentication.userId, cursorId, PageRequest.of(0, 10));
         return ResponseEntity.ok().body(recentAllPosts);
     }
 

src/main/java/org/ahpuh/surf/post/repository/PostRepository.java

@@ -26,6 +26,8 @@ public interface PostRepository extends JpaRepository<Post, Long>, PostRepositor
 
     List<Post> findByCategory(Category category);
 
-    List<Post> findTop100ByIsDeletedIsFalseOrderByCreatedAtDesc(Pageable page);
+    List<Post> findTop10ByCreatedAtIsLessThanEqualOrderByCreatedAtDesc(LocalDateTime createdAt, Pageable page);
+
+    List<Post> findTop10ByCreatedAtIsLessThanOrderByCreatedAtDesc(LocalDateTime createdAt, Pageable page);
 
 }

src/main/java/org/ahpuh/surf/post/service/PostService.java

@@ -35,6 +35,6 @@ public interface PostService {
 
     int getRecentScore(Long categoryId);
 
-    List<RecentPostDto> recentAllPosts(Long myId);
+    CursorResult<RecentPostDto> recentAllPosts(Long myId, Long cursorId, Pageable page);
 
 }

src/main/java/org/ahpuh/surf/post/service/PostServiceImpl.java

@@ -13,14 +13,13 @@
 import org.ahpuh.surf.post.repository.PostRepository;
 import org.ahpuh.surf.user.entity.User;
 import org.ahpuh.surf.user.repository.UserRepository;
-import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.List;
-import java.util.stream.Collectors;
 
 @RequiredArgsConstructor
 @Transactional(readOnly = true)
@@ -215,13 +214,30 @@ private Post getPostById(final Long postId) {
                 .orElseThrow(() -> EntityExceptionHandler.PostNotFound(postId));
     }
 
-    public List<RecentPostDto> recentAllPosts(final Long myId) {
+    public CursorResult<RecentPostDto> recentAllPosts(final Long myId, final Long cursorId, final Pageable page) {
         final User me = userRepository.findById(myId)
                 .orElseThrow(() -> EntityExceptionHandler.UserNotFound(myId));
-        return postRepository.findTop100ByIsDeletedIsFalseOrderByCreatedAtDesc(PageRequest.of(0, 100))
-                .stream()
+        final Post findPost = postRepository.findById(cursorId).orElse(null);
+
+        final List<Post> postList = findPost == null
+                ? postRepository.findTop10ByCreatedAtIsLessThanEqualOrderByCreatedAtDesc(LocalDateTime.now(), page)
+                : postRepository.findTop10ByCreatedAtIsLessThanOrderByCreatedAtDesc(findPost.getCreatedAt(), page);
+
+        if (postList.isEmpty()) {
+            return new CursorResult<>(List.of(), false);
+        }
+
+        final List<RecentPostDto> posts = postList.stream()
                 .map(postEntity -> postConverter.toRecentAllPosts(postEntity, me))
-                .collect(Collectors.toList());
+                .toList();
+
+        final Post lastPost = postList.get(postList.size() - 1);
+        final boolean hasNext = !postRepository.findTop10ByCreatedAtIsLessThanOrderByCreatedAtDesc(
+                        lastPost.getCreatedAt(),
+                        page)
+                .isEmpty();
+
+        return new CursorResult<>(posts, hasNext);
     }
 
 }

src/test/java/org/ahpuh/surf/user/controller/UserControllerTest.java

@@ -164,7 +164,6 @@ void testUpdateUser() throws Exception {
 
         // Then
         final User user11 = userRepository.findAll().get(0);
-        System.out.println("말이돼냐 -> " + user11.getProfilePhotoUrl());
         assertAll("afterUpdate",
                 () -> assertThat(user11.getUserName(), is("수정된 name")),
                 () -> assertThat(user11.getUrl(), is("내 블로그 주소")),