diff --git a/backend/src/main/java/com/openisle/controller/PostController.java b/backend/src/main/java/com/openisle/controller/PostController.java
index 907358c30..963e06bb6 100644
--- a/backend/src/main/java/com/openisle/controller/PostController.java
+++ b/backend/src/main/java/com/openisle/controller/PostController.java
@@ -203,8 +203,8 @@ public class PostController {
 //            userVisitService.recordVisit(auth.getName());
 //        }
 
-        return postService.listPostsByLatestReply(ids, tids, page, pageSize)
-                .stream().map(postMapper::toSummaryDto).collect(Collectors.toList());
+        List<Post> posts = postService.listPostsByLatestReply(ids, tids, page, pageSize);
+        return posts.stream().map(postMapper::toSummaryDto).collect(Collectors.toList());
     }
 
     @GetMapping("/featured")
diff --git a/backend/src/main/java/com/openisle/mapper/PostMapper.java b/backend/src/main/java/com/openisle/mapper/PostMapper.java
index bd4a04826..959129236 100644
--- a/backend/src/main/java/com/openisle/mapper/PostMapper.java
+++ b/backend/src/main/java/com/openisle/mapper/PostMapper.java
@@ -96,8 +96,6 @@ public class PostMapper {
             l.setPointCost(lp.getPointCost());
             l.setStartTime(lp.getStartTime());
             l.setEndTime(lp.getEndTime());
-            l.setParticipants(lp.getParticipants().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
-            l.setWinners(lp.getWinners().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
             dto.setLottery(l);
         }
 
@@ -106,7 +104,6 @@ public class PostMapper {
             p.setOptions(pp.getOptions());
             p.setVotes(pp.getVotes());
             p.setEndTime(pp.getEndTime());
-            p.setParticipants(pp.getParticipants().stream().map(userMapper::toAuthorDto).collect(Collectors.toList()));
             Map<Integer, List<AuthorDto>> optionParticipants = pollVoteRepository.findByPostId(pp.getId()).stream()
                     .collect(Collectors.groupingBy(PollVote::getOptionIndex,
                             Collectors.mapping(v -> userMapper.toAuthorDto(v.getUser()), Collectors.toList())));
diff --git a/backend/src/main/java/com/openisle/scheduler/UserVisitScheduler.java b/backend/src/main/java/com/openisle/scheduler/UserVisitScheduler.java
index ff16fe3c4..139963587 100644
--- a/backend/src/main/java/com/openisle/scheduler/UserVisitScheduler.java
+++ b/backend/src/main/java/com/openisle/scheduler/UserVisitScheduler.java
@@ -27,12 +27,12 @@ public class UserVisitScheduler {
     private final UserRepository userRepository;
     private final UserVisitRepository userVisitRepository;
 
-    @Scheduled(cron = "0 5 0 * * ?")// 每天 00:05 执行
+    @Scheduled(cron = "0 5 0 * * ?") // 每天 00:05 执行
     public void persistDailyVisits(){
         LocalDate yesterday = LocalDate.now().minusDays(1);
-        String key = CachingConfig.VISIT_CACHE_NAME+":"+ yesterday;
+        String key = CachingConfig.VISIT_CACHE_NAME + ":" + yesterday;
         Set<String> usernames = redisTemplate.opsForSet().members(key);
-        if(!CollectionUtils.isEmpty(usernames)){
+        if (!CollectionUtils.isEmpty(usernames)) {
             for(String username: usernames){
                 User user = userRepository.findByUsername(username).orElse(null);
                 if(user != null){
diff --git a/backend/src/main/java/com/openisle/service/UserVisitService.java b/backend/src/main/java/com/openisle/service/UserVisitService.java
index 272c846de..9182e145f 100644
--- a/backend/src/main/java/com/openisle/service/UserVisitService.java
+++ b/backend/src/main/java/com/openisle/service/UserVisitService.java
@@ -49,9 +49,9 @@ public class UserVisitService {
                 .orElseThrow(() -> new com.openisle.exception.NotFoundException("User not found"));
 
         // 如果缓存存在就返回
-        String key1 = CachingConfig.VISIT_CACHE_NAME + ":"+LocalDate.now()+":count:"+username;
+        String key1 = CachingConfig.VISIT_CACHE_NAME + ":" +LocalDate.now() + ":count:" + username;
         Integer cached = (Integer) redisTemplate.opsForValue().get(key1);
-        if(cached != null){
+        if (cached != null){
             return cached.longValue();
         }