feat: 탐색페이지 사용자 추천 리스트 API 구현 (#81)

* refactor: 코딩 컨벤션 적용 안된 부분 수정 (#75)

* feat: 탐색페이지 사용자 추천 리스트 API 구현 (#75)

* refactor: api uri 변경 (#75)

src/main/java/com/listywave/list/application/dto/response/ListTrandingResponse.java

@@ -12,6 +12,7 @@ public record ListTrandingResponse(
         String itemImageUrl,
         String backgroundColor
 ) {
+
     public static ListTrandingResponse of(Lists list, String imageUrlTopRankItem) {
         return ListTrandingResponse.builder()
                 .id(list.getId())

src/main/java/com/listywave/user/application/dto/AllUserListsResponse.java

@@ -8,6 +8,7 @@ public record AllUserListsResponse(
         Boolean hasNext,
         List<FeedListsResponse> feedLists
 ) {
+
     public static AllUserListsResponse of(boolean hasNext, Long cursorId, List<Lists> feedLists) {
         return new AllUserListsResponse(
                 cursorId,

src/main/java/com/listywave/user/application/dto/FeedListsResponse.java

@@ -14,6 +14,7 @@ public record FeedListsResponse(
         String backgroundColor,
         List<ListItemsResponse> listItems
 ) {
+
     public static FeedListsResponse of(Lists lists) {
         return FeedListsResponse.builder()
                 .id(lists.getId())
@@ -32,6 +33,7 @@ record ListItemsResponse(
         String title,
         String imageUrl
 ) {
+
     public static ListItemsResponse of(Item item) {
         return ListItemsResponse.builder()
                 .id(item.getId())

src/main/java/com/listywave/user/application/dto/RecommendUsersResponse.java

@@ -0,0 +1,20 @@
+package com.listywave.user.application.dto;
+
+import com.listywave.user.application.domain.User;
+import lombok.Builder;
+
+@Builder
+public record RecommendUsersResponse(
+        Long id,
+        String nickname,
+        String profileImageUrl
+) {
+
+    public static RecommendUsersResponse of(User user) {
+        return RecommendUsersResponse.builder()
+                .id(user.getId())
+                .nickname(user.getNickname())
+                .profileImageUrl(user.getProfileImageUrl())
+                .build();
+    }
+}

src/main/java/com/listywave/user/application/service/UserService.java

@@ -9,6 +9,7 @@
 import com.listywave.user.application.dto.AllUserListsResponse;
 import com.listywave.user.application.dto.AllUserResponse;
 import com.listywave.user.application.dto.FollowingsResponse;
+import com.listywave.user.application.dto.RecommendUsersResponse;
 import com.listywave.user.application.dto.UserInfoResponse;
 import com.listywave.user.repository.follow.FollowRepository;
 import com.listywave.user.repository.user.UserRepository;
@@ -103,4 +104,12 @@ public void unfollow(Long followingUserId, String accessToken) {
 
         followRepository.deleteByFollowingUserAndFollowerUser(followingUser, followerUser);
     }
+
+     @Transactional(readOnly = true)
+     public List<RecommendUsersResponse> getRecommendUsers() {
+         List<User> recommendUsers = userRepository.getRecommendUsers();
+         return recommendUsers.stream()
+                .map(RecommendUsersResponse::of)
+                .toList();
+     }
 }

src/main/java/com/listywave/user/presentation/UserController.java

@@ -6,8 +6,10 @@
 import com.listywave.user.application.dto.AllUserListsResponse;
 import com.listywave.user.application.dto.AllUserResponse;
 import com.listywave.user.application.dto.FollowingsResponse;
+import com.listywave.user.application.dto.RecommendUsersResponse;
 import com.listywave.user.application.dto.UserInfoResponse;
 import com.listywave.user.application.service.UserService;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
@@ -74,4 +76,10 @@ ResponseEntity<Void> unfollow(
         userService.unfollow(followingUserId, accessToken);
         return ResponseEntity.noContent().build();
     }
+
+    @GetMapping("/users/recommend")
+    ResponseEntity<List<RecommendUsersResponse>> getRecommendUsers() {
+        List<RecommendUsersResponse> recommendUsers = userService.getRecommendUsers();
+        return ResponseEntity.ok(recommendUsers);
+    }
 }

src/main/java/com/listywave/user/repository/user/custom/CustomUserRepository.java

@@ -2,9 +2,12 @@
 
 import com.listywave.list.application.domain.CategoryType;
 import com.listywave.list.application.domain.Lists;
+import com.listywave.user.application.domain.User;
 import java.util.List;
 
 public interface CustomUserRepository {
 
     List<Lists> findFeedLists(Long userId, String type, CategoryType category, Long cursorId, int size);
+
+    List<User> getRecommendUsers();
 }

src/main/java/com/listywave/user/repository/user/custom/impl/CustomUserRepositoryImpl.java

@@ -2,9 +2,11 @@
 
 import static com.listywave.list.application.domain.QItem.item;
 import static com.listywave.list.application.domain.QLists.lists;
+import static com.listywave.user.application.domain.QUser.user;
 
 import com.listywave.list.application.domain.CategoryType;
 import com.listywave.list.application.domain.Lists;
+import com.listywave.user.application.domain.User;
 import com.listywave.user.repository.user.custom.CustomUserRepository;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.impl.JPAQueryFactory;
@@ -56,4 +58,17 @@ private BooleanExpression typeEq(String type) {
     private BooleanExpression userIdEq(Long userId) {
         return userId == null ? null : lists.user.id.eq(userId);
     }
+
+    @Override
+    public List<User> getRecommendUsers() {
+        List<User> fetch = queryFactory
+                .select(user)
+                .from(lists)
+                .rightJoin(lists.user, user)
+                .groupBy(user)
+                .orderBy(lists.updatedDate.max().desc())
+                .limit(10)
+                .fetch();
+        return fetch;
+    }
 }