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fix: 게시글 중복 생성 방지 #649

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Merged
JAEHEE25 merged 3 commits into from
Feb 12, 2026
Merged

fix: 게시글 중복 생성 방지 #649

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6a3ceed
fix: 게시글 중복 생성 방지
JAEHEE25 Feb 3, 2026
f8b2888
fix: 게시글 중복 생성 방지
JAEHEE25 Feb 3, 2026
22e47d4
refactor: 게시글 중복 생성 방지
JAEHEE25 Feb 12, 2026
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8 changes: 4 additions & 4 deletions src/main/java/com/example/solidconnection/cache/ThunderingHerdCachingAspect.java
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@@ -1,9 +1,9 @@
package com.example.solidconnection.cache;

import static com.example.solidconnection.community.post.service.RedisConstants.CREATE_CHANNEL;
import static com.example.solidconnection.community.post.service.RedisConstants.LOCK_TIMEOUT_MS;
import static com.example.solidconnection.community.post.service.RedisConstants.MAX_WAIT_TIME_MS;
import static com.example.solidconnection.community.post.service.RedisConstants.REFRESH_LIMIT_PERCENT;
import static com.example.solidconnection.redis.RedisConstants.CREATE_CHANNEL;
import static com.example.solidconnection.redis.RedisConstants.LOCK_TIMEOUT_MS;
import static com.example.solidconnection.redis.RedisConstants.MAX_WAIT_TIME_MS;
import static com.example.solidconnection.redis.RedisConstants.REFRESH_LIMIT_PERCENT;

import com.example.solidconnection.cache.annotation.ThunderingHerdCaching;
import com.example.solidconnection.cache.manager.CacheManager;
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2 changes: 1 addition & 1 deletion src/main/java/com/example/solidconnection/common/config/redis/RedisConfig.java
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@@ -1,6 +1,6 @@
package com.example.solidconnection.common.config.redis;

import static com.example.solidconnection.community.post.service.RedisConstants.CREATE_CHANNEL;
import static com.example.solidconnection.redis.RedisConstants.CREATE_CHANNEL;

import com.example.solidconnection.cache.CacheUpdateListener;
import org.springframework.beans.factory.annotation.Value;
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1 change: 1 addition & 0 deletions src/main/java/com/example/solidconnection/common/exception/ErrorCode.java
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Expand Up @@ -96,6 +96,7 @@ public enum ErrorCode {
INVALID_BOARD_CODE(HttpStatus.BAD_REQUEST.value(), "잘못된 게시판 코드입니다."),
INVALID_POST_ID(HttpStatus.BAD_REQUEST.value(), "존재하지 않는 게시글입니다."), // todo: NOT_FOUND로 통일 필요
INVALID_POST_ACCESS(HttpStatus.BAD_REQUEST.value(), "자신의 게시글만 제어할 수 있습니다."),
DUPLICATE_POST_CREATE_REQUEST(HttpStatus.BAD_REQUEST.value(), "게시글이 이미 생성 중입니다."),
CAN_NOT_DELETE_OR_UPDATE_QUESTION(HttpStatus.BAD_REQUEST.value(), "질문글은 수정이나 삭제할 수 없습니다."),
CAN_NOT_UPLOAD_MORE_THAN_FIVE_IMAGES(HttpStatus.BAD_REQUEST.value(), "5개 이상의 파일을 업로드할 수 없습니다."),
INVALID_COMMENT_ID(HttpStatus.BAD_REQUEST.value(), "존재하지 않는 댓글입니다."),
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14 changes: 9 additions & 5 deletions src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java
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Expand Up @@ -2,6 +2,7 @@

import static com.example.solidconnection.common.exception.ErrorCode.CAN_NOT_DELETE_OR_UPDATE_QUESTION;
import static com.example.solidconnection.common.exception.ErrorCode.CAN_NOT_UPLOAD_MORE_THAN_FIVE_IMAGES;
import static com.example.solidconnection.common.exception.ErrorCode.DUPLICATE_POST_CREATE_REQUEST;
import static com.example.solidconnection.common.exception.ErrorCode.INVALID_POST_ACCESS;
import static com.example.solidconnection.common.exception.ErrorCode.INVALID_POST_CATEGORY;
import static com.example.solidconnection.common.exception.ErrorCode.USER_NOT_FOUND;
Expand All @@ -23,7 +24,6 @@
import com.example.solidconnection.s3.service.S3Service;
import com.example.solidconnection.siteuser.domain.SiteUser;
import com.example.solidconnection.siteuser.repository.SiteUserRepository;
import com.example.solidconnection.util.RedisUtils;
import java.util.List;
import java.util.Objects;
import lombok.RequiredArgsConstructor;
Expand All @@ -40,18 +40,23 @@ public class PostCommandService {
private final BoardRepository boardRepository;
private final SiteUserRepository siteUserRepository;
private final S3Service s3Service;
private final RedisService redisService;
private final RedisUtils redisUtils;
private final PostRedisManager postRedisManager;

@Transactional
public PostCreateResponse createPost(long siteUserId, PostCreateRequest postCreateRequest,
List<MultipartFile> imageFile) {
SiteUser siteUser = siteUserRepository.findById(siteUserId)
.orElseThrow(() -> new CustomException(USER_NOT_FOUND));

// 유효성 검증
validatePostCategory(postCreateRequest.postCategory());
validateFileSize(imageFile);

// 중복 생성 방지
if (!postRedisManager.isPostCreationAllowed(siteUserId)) {
throw new CustomException(DUPLICATE_POST_CREATE_REQUEST);
}
Comment on lines +55 to +58
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@coderabbitai coderabbitai bot Feb 12, 2026

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⚠️ Potential issue | 🟠 Major

🧩 Analysis chain

🏁 Script executed:

fd "PostRedisManager.java" -t f --exec cat {}

Repository: solid-connection/solid-connect-server

Length of output: 2330

🏁 Script executed:

fd "PostCommandService.java" -t f --exec cat {}

Repository: solid-connection/solid-connect-server

Length of output: 6411

🏁 Script executed:

fd "RedisService.java" -t f --exec cat {}

Repository: solid-connection/solid-connect-server

Length of output: 1878

🏁 Script executed:

fd "RedisConstants.java" -t f --exec cat {}

Repository: solid-connection/solid-connect-server

Length of output: 789

생성 실패 시 Redis 락이 해제되지 않는 문제를 수정하세요.

  1. 문제의 원인

    • isPostCreationAllowed()는 Redis의 SETNX(setIfAbsent) 명령으로 5초 TTL의 락을 설정합니다.
    • 락이 성공적으로 획득되면 메서드가 true를 반환하고, 이후 Board 조회·Post 저장·S3 이미지 업로드가 진행됩니다.
    • 이 과정 중 예외가 발생하면 트랜잭션은 롤백되지만, Redis 락은 그대로 남아 5초의 TTL이 만료될 때까지 유지됩니다.

  2. 사용자 영향

    • 사용자가 게시글 생성 중 S3 업로드 실패, DB 저장 실패 등의 예외를 만나면, 실제로는 게시글이 생성되지 않습니다.
    • 그러나 Redis 락이 여전히 활성화되어 있어서, 사용자가 즉시 재시도할 때 "게시글이 이미 생성 중입니다" 400 에러를 받게 됩니다.
    • 실제 게시글이 없는데도 최대 5초간 재시도가 차단되므로 사용 경험이 저하됩니다.

  3. 수정 방향

    • 생성 실패 시 락을 명시적으로 해제해야 합니다.
    • try-catch 블록으로 감싸거나, PostRedisManager에 락 해제 메서드를 추가하는 방식을 권장합니다.
🛠️ 제안하는 구현 예시 
         // 중복 생성 방지
         if (!postRedisManager.isPostCreationAllowed(siteUserId)) {
             throw new CustomException(DUPLICATE_POST_CREATE_REQUEST);
         }

-        // 객체 생성
-        Board board = boardRepository.getByCode(postCreateRequest.boardCode());
-        Post post = postCreateRequest.toEntity(siteUser, board);
-
-        // 이미지 처리
-        savePostImages(imageFile, post);
-        Post createdPost = postRepository.save(post);
-
-        return PostCreateResponse.from(createdPost);
+        try {
+            // 객체 생성
+            Board board = boardRepository.getByCode(postCreateRequest.boardCode());
+            Post post = postCreateRequest.toEntity(siteUser, board);
+
+            // 이미지 처리
+            savePostImages(imageFile, post);
+            Post createdPost = postRepository.save(post);
+
+            return PostCreateResponse.from(createdPost);
+        } catch (Exception e) {
+            postRedisManager.releasePostCreationLock(siteUserId);
+            throw e;
+        }

PostRedisManager에 다음 메서드를 추가하세요:

public void releasePostCreationLock(long siteUserId) {
    String key = getPostCreateRedisKey(siteUserId);
    redisService.deleteKey(key);
}
🤖 Prompt for AI Agents 
In
`@src/main/java/com/example/solidconnection/community/post/service/PostCommandService.java`
around lines 55 - 58, The Redis lock acquired by
PostRedisManager.isPostCreationAllowed(siteUserId) is not released on failures;
wrap the post creation flow in PostCommandService.create* (where
isPostCreationAllowed is called) with try/catch/finally and call a new
PostRedisManager.releasePostCreationLock(siteUserId) in the failure path (or
finally when creation did not succeed) so the SETNX lock is deleted on
exceptions; add releasePostCreationLock in PostRedisManager that deletes the key
(e.g., getPostCreateRedisKey(siteUserId) -> redisService.deleteKey(key)) and
invoke it from the catch/finally in the service when DB/S3/upload or any
subsequent step fails.


// 객체 생성
Board board = boardRepository.getByCode(postCreateRequest.boardCode());
Post post = postCreateRequest.toEntity(siteUser, board);
Expand Down Expand Up @@ -104,8 +109,7 @@ public PostDeleteResponse deletePostById(long siteUserId, Long postId) {
validateQuestion(post);

removePostImages(post);
// cache out
redisService.deleteKey(redisUtils.getPostViewCountRedisKey(postId));
postRedisManager.deleteViewCountCache(postId);
postRepository.deleteById(post.getId());

return new PostDeleteResponse(postId);
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9 changes: 2 additions & 7 deletions src/main/java/com/example/solidconnection/community/post/service/PostQueryService.java
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Expand Up @@ -23,7 +23,6 @@
import com.example.solidconnection.siteuser.dto.PostFindSiteUserResponse;
import com.example.solidconnection.siteuser.repository.SiteUserRepository;
import com.example.solidconnection.siteuser.repository.UserBlockRepository;
import com.example.solidconnection.util.RedisUtils;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
Expand All @@ -42,8 +41,7 @@ public class PostQueryService {
private final SiteUserRepository siteUserRepository;
private final UserBlockRepository userBlockRepository;
private final CommentService commentService;
private final RedisService redisService;
private final RedisUtils redisUtils;
private final PostRedisManager postRedisManager;

@Transactional(readOnly = true)
public List<PostListResponse> findPostsByCodeAndPostCategoryOrderByCreatedAtDesc(String code, String category, Long siteUserId) {
Expand Down Expand Up @@ -81,10 +79,7 @@ public PostFindResponse findPostById(long siteUserId, Long postId) {
List<PostFindPostImageResponse> postImageFindResultDTOList = PostFindPostImageResponse.from(post.getPostImageList());
List<PostFindCommentResponse> commentFindResultDTOList = commentService.findCommentsByPostId(siteUser.getId(), postId);

// caching && 어뷰징 방지
if (redisService.isPresent(redisUtils.getValidatePostViewCountRedisKey(siteUser.getId(), postId))) {
redisService.increaseViewCount(redisUtils.getPostViewCountRedisKey(postId));
}
postRedisManager.incrementViewCountIfFirstAccess(siteUser.getId(), postId);

return PostFindResponse.from(
post, isOwner, isLiked, boardPostFindResultDTO, siteUserPostFindResultDTO, commentFindResultDTOList, postImageFindResultDTOList);
Expand Down
58 changes: 58 additions & 0 deletions src/main/java/com/example/solidconnection/community/post/service/PostRedisManager.java
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@@ -0,0 +1,58 @@
package com.example.solidconnection.community.post.service;

import static com.example.solidconnection.redis.RedisConstants.POST_CREATE_PREFIX;
import static com.example.solidconnection.redis.RedisConstants.VALIDATE_POST_CREATE_TTL;
import static com.example.solidconnection.redis.RedisConstants.VALIDATE_VIEW_COUNT_KEY_PREFIX;
import static com.example.solidconnection.redis.RedisConstants.VALIDATE_VIEW_COUNT_TTL;
import static com.example.solidconnection.redis.RedisConstants.VIEW_COUNT_KEY_PREFIX;

import com.example.solidconnection.redis.RedisService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class PostRedisManager {
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@whqtker whqtker Feb 10, 2026

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흩어진 Post 관련 레디스 메서드 한 곳으로 통합하는 거 좋은 거 같아요 !


private final RedisService redisService;

public Long getPostIdFromPostViewCountRedisKey(String key) {
return Long.parseLong(key.substring(VIEW_COUNT_KEY_PREFIX.getValue().length()));
}

public Long getAndDeleteViewCount(String key) {
return redisService.getAndDelete(key);
}

public void deleteViewCountCache(Long postId) {
String key = getPostViewCountRedisKey(postId);
redisService.deleteKey(key);
}

public void incrementViewCountIfFirstAccess(long siteUserId, Long postId) {
String validateKey = getValidatePostViewCountRedisKey(siteUserId, postId);
boolean isFirstAccess = redisService.isPresent(validateKey, VALIDATE_VIEW_COUNT_TTL.getValue());

if (isFirstAccess) {
String viewCountKey = getPostViewCountRedisKey(postId);
redisService.increaseViewCount(viewCountKey);
}
}

public String getPostViewCountRedisKey(Long postId) {
return VIEW_COUNT_KEY_PREFIX.getValue() + postId;
}

public String getValidatePostViewCountRedisKey(long siteUserId, Long postId) {
return VALIDATE_VIEW_COUNT_KEY_PREFIX.getValue() + postId + ":" + siteUserId;
}

public boolean isPostCreationAllowed(Long siteUserId) {
String key = getPostCreateRedisKey(siteUserId);
return redisService.isPresent(key, VALIDATE_POST_CREATE_TTL.getValue());
}

public String getPostCreateRedisKey(Long siteUserId) {
return POST_CREATE_PREFIX.getValue() + siteUserId;
}
}
10 changes: 4 additions & 6 deletions src/main/java/com/example/solidconnection/community/post/service/UpdateViewCountService.java
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Expand Up @@ -2,7 +2,6 @@

import com.example.solidconnection.community.post.domain.Post;
import com.example.solidconnection.community.post.repository.PostRepository;
import com.example.solidconnection.util.RedisUtils;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
Expand All @@ -17,14 +16,13 @@
public class UpdateViewCountService {

private final PostRepository postRepository;
private final RedisService redisService;
private final RedisUtils redisUtils;
private final PostRedisManager postRedisManager;

@Transactional
@Async
public void updateViewCount(String key) {
Long postId = redisUtils.getPostIdFromPostViewCountRedisKey(key);
Post post = postRepository.getById(postId);
postRepository.increaseViewCount(postId, redisService.getAndDelete(key));
Long postId = postRedisManager.getPostIdFromPostViewCountRedisKey(key);
Long viewCount = postRedisManager.getAndDeleteViewCount(key);
postRepository.increaseViewCount(postId, viewCount);
}
}
7 changes: 5 additions & 2 deletions ...ommunity/post/service/RedisConstants.java → ...solidconnection/redis/RedisConstants.java
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@@ -1,4 +1,4 @@
package com.example.solidconnection.community.post.service;
package com.example.solidconnection.redis;

import lombok.Getter;

Expand All @@ -15,7 +15,10 @@ public enum RedisConstants {
REFRESH_LOCK_PREFIX("refresh_lock:"),
LOCK_TIMEOUT_MS("10000"),
MAX_WAIT_TIME_MS("3000"),
CREATE_CHANNEL("create_channel");
CREATE_CHANNEL("create_channel"),

POST_CREATE_PREFIX("post_create_lock:"),
VALIDATE_POST_CREATE_TTL("5");

private final String value;

Expand Down
12 changes: 6 additions & 6 deletions .../community/post/service/RedisService.java → ...e/solidconnection/redis/RedisService.java
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@@ -1,7 +1,6 @@
package com.example.solidconnection.community.post.service;
package com.example.solidconnection.redis;

import static com.example.solidconnection.community.post.service.RedisConstants.VALIDATE_VIEW_COUNT_TTL;
import static com.example.solidconnection.community.post.service.RedisConstants.VIEW_COUNT_TTL;
import static com.example.solidconnection.redis.RedisConstants.VIEW_COUNT_TTL;

import java.util.Collections;
import java.util.concurrent.TimeUnit;
Expand Down Expand Up @@ -34,12 +33,13 @@ public void deleteKey(String key) {
}

public Long getAndDelete(String key) {
return Long.valueOf(redisTemplate.opsForValue().getAndDelete(key));
String value = redisTemplate.opsForValue().getAndDelete(key);
return value != null ? Long.valueOf(value) : null;
}

public boolean isPresent(String key) {
public boolean isPresent(String key, String ttl) {
return Boolean.TRUE.equals(redisTemplate.opsForValue()
.setIfAbsent(key, "1", Long.parseLong(VALIDATE_VIEW_COUNT_TTL.getValue()), TimeUnit.SECONDS));
.setIfAbsent(key, "1", Long.parseLong(ttl), TimeUnit.SECONDS));
}

public boolean isKeyExists(String key) {
Expand Down
2 changes: 1 addition & 1 deletion src/main/java/com/example/solidconnection/scheduler/UpdateViewCountScheduler.java
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@@ -1,6 +1,6 @@
package com.example.solidconnection.scheduler;

import static com.example.solidconnection.community.post.service.RedisConstants.VIEW_COUNT_KEY_PATTERN;
import static com.example.solidconnection.redis.RedisConstants.VIEW_COUNT_KEY_PATTERN;

import com.example.solidconnection.community.post.service.UpdateViewCountService;
import com.example.solidconnection.util.RedisUtils;
Expand Down
18 changes: 2 additions & 16 deletions src/main/java/com/example/solidconnection/util/RedisUtils.java
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@@ -1,9 +1,7 @@
package com.example.solidconnection.util;

import static com.example.solidconnection.community.post.service.RedisConstants.CREATE_LOCK_PREFIX;
import static com.example.solidconnection.community.post.service.RedisConstants.REFRESH_LOCK_PREFIX;
import static com.example.solidconnection.community.post.service.RedisConstants.VALIDATE_VIEW_COUNT_KEY_PREFIX;
import static com.example.solidconnection.community.post.service.RedisConstants.VIEW_COUNT_KEY_PREFIX;
import static com.example.solidconnection.redis.RedisConstants.CREATE_LOCK_PREFIX;
import static com.example.solidconnection.redis.RedisConstants.REFRESH_LOCK_PREFIX;

import java.util.Collections;
import java.util.Comparator;
Expand Down Expand Up @@ -39,18 +37,6 @@ public Long getExpirationTime(String key) {
return redisTemplate.getExpire(key, TimeUnit.MILLISECONDS);
}

public String getPostViewCountRedisKey(Long postId) {
return VIEW_COUNT_KEY_PREFIX.getValue() + postId;
}

public String getValidatePostViewCountRedisKey(long siteUserId, Long postId) {
return VALIDATE_VIEW_COUNT_KEY_PREFIX.getValue() + postId + ":" + siteUserId;
}

public Long getPostIdFromPostViewCountRedisKey(String key) {
return Long.parseLong(key.substring(VIEW_COUNT_KEY_PREFIX.getValue().length()));
}

public String generateCacheKey(String keyPattern, Object[] args) {
for (int i = 0; i < args.length; i++) {
// 키 패턴에 {i}가 포함된 경우에만 해당 인덱스의 파라미터를 삽입
Expand Down
6 changes: 3 additions & 3 deletions src/test/java/com/example/solidconnection/community/post/service/PostCommandServiceTest.java
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Expand Up @@ -25,13 +25,13 @@
import com.example.solidconnection.community.post.fixture.PostFixture;
import com.example.solidconnection.community.post.fixture.PostImageFixture;
import com.example.solidconnection.community.post.repository.PostRepository;
import com.example.solidconnection.redis.RedisService;
import com.example.solidconnection.s3.domain.UploadPath;
import com.example.solidconnection.s3.dto.UploadedFileUrlResponse;
import com.example.solidconnection.s3.service.S3Service;
import com.example.solidconnection.siteuser.domain.SiteUser;
import com.example.solidconnection.siteuser.fixture.SiteUserFixture;
import com.example.solidconnection.support.TestContainerSpringBootTest;
import com.example.solidconnection.util.RedisUtils;
import jakarta.transaction.Transactional;
import java.util.List;
import org.junit.jupiter.api.BeforeEach;
Expand All @@ -57,7 +57,7 @@ class PostCommandServiceTest {
private RedisService redisService;

@Autowired
private RedisUtils redisUtils;
private PostRedisManager postRedisManager;

@Autowired
private PostRepository postRepository;
Expand Down Expand Up @@ -266,7 +266,7 @@ class 게시글_삭제_테스트 {
// given
String originImageUrl = "origin-image-url";
postImageFixture.게시글_이미지(originImageUrl, post);
String viewCountKey = redisUtils.getPostViewCountRedisKey(post.getId());
String viewCountKey = postRedisManager.getPostViewCountRedisKey(post.getId());
redisService.increaseViewCount(viewCountKey);

// when
Expand Down
8 changes: 4 additions & 4 deletions src/test/java/com/example/solidconnection/community/post/service/PostQueryServiceTest.java
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Expand Up @@ -17,11 +17,11 @@
import com.example.solidconnection.community.post.dto.PostListResponse;
import com.example.solidconnection.community.post.fixture.PostFixture;
import com.example.solidconnection.community.post.fixture.PostImageFixture;
import com.example.solidconnection.redis.RedisService;
import com.example.solidconnection.siteuser.domain.SiteUser;
import com.example.solidconnection.siteuser.fixture.SiteUserFixture;
import com.example.solidconnection.siteuser.fixture.UserBlockFixture;
import com.example.solidconnection.support.TestContainerSpringBootTest;
import com.example.solidconnection.util.RedisUtils;
import java.time.ZonedDateTime;
import java.util.List;
import org.junit.jupiter.api.BeforeEach;
Expand All @@ -40,7 +40,7 @@ class PostQueryServiceTest {
private RedisService redisService;

@Autowired
private RedisUtils redisUtils;
private PostRedisManager postRedisManager;

@Autowired
private SiteUserFixture siteUserFixture;
Expand Down Expand Up @@ -176,8 +176,8 @@ void setUp() {
Comment comment2 = commentFixture.부모_댓글("댓글2", post, user);
List<Comment> comments = List.of(comment1, comment2);

String validateKey = redisUtils.getValidatePostViewCountRedisKey(user.getId(), post.getId());
String viewCountKey = redisUtils.getPostViewCountRedisKey(post.getId());
String validateKey = postRedisManager.getValidatePostViewCountRedisKey(user.getId(), post.getId());
String viewCountKey = postRedisManager.getPostViewCountRedisKey(post.getId());

// when
PostFindResponse response = postQueryService.findPostById(user.getId(), post.getId());
Expand Down
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