feat : 팔로워가 최근 등록한 인증 목록 조회

src/main/java/com/codeit/todo/repository/CompleteRepository.java

@@ -1,10 +1,20 @@
 package com.codeit.todo.repository;
 
 import com.codeit.todo.domain.Complete;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
 
 import java.util.List;
 
 public interface CompleteRepository extends JpaRepository<Complete, Integer> {
     List<Complete> findByTodo_TodoId(int todoId);
+
+    @Query("select c from Complete c where c.todo.goal.user.userId in :userIds order by c.createdAt desc")
+    Slice<Complete> findByFollowees(@Param("userIds") List<Integer> userIds, Pageable pageable);
+
+    @Query("select c from Complete c where c.todo.goal.user.userId in :userIds and c.completeId > :completeId order by c.createdAt desc")
+    Slice<Complete> findByFolloweesAfterCompleteId(@Param("userIds")List<Integer> followeeIds, @Param("completeId") Integer completeId, Pageable pageable);
 }

src/main/java/com/codeit/todo/repository/FollowRepository.java

@@ -6,6 +6,8 @@
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
 
+import java.util.List;
+
 public interface FollowRepository extends JpaRepository<Follow, Integer> {
     @Query(
             "SELECT COUNT(f) > 0 " +
@@ -24,5 +26,7 @@ public interface FollowRepository extends JpaRepository<Follow, Integer> {
     int countByFollowee(@Param("userId") int userId);
 
 
+    @Query("select f.followee.userId from Follow f where f.follower.userId = :userId")
+    List<Integer> findFolloweeIdsByFollowerId(@Param("userId") int userId);
 }
 

src/main/java/com/codeit/todo/service/follow/FollowService.java

@@ -0,0 +1,9 @@
+package com.codeit.todo.service.follow;
+
+import com.codeit.todo.web.dto.request.follow.ReadFollowRequest;
+import com.codeit.todo.web.dto.response.follow.ReadFollowResponse;
+import org.springframework.data.domain.Slice;
+
+public interface FollowService {
+    Slice<ReadFollowResponse> readFollows(int userId, ReadFollowRequest request);
+}

src/main/java/com/codeit/todo/service/follow/impl/FollowServiceImpl.java

@@ -0,0 +1,58 @@
+package com.codeit.todo.service.follow.impl;
+
+import com.codeit.todo.domain.Complete;
+import com.codeit.todo.repository.CompleteRepository;
+import com.codeit.todo.repository.FollowRepository;
+import com.codeit.todo.repository.LikesRepository;
+import com.codeit.todo.service.follow.FollowService;
+import com.codeit.todo.web.dto.request.follow.ReadFollowRequest;
+import com.codeit.todo.web.dto.response.follow.ReadFollowResponse;
+import com.codeit.todo.web.dto.response.slice.CustomSlice;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.Objects;
+
+@Service
+@RequiredArgsConstructor
+@Transactional
+public class FollowServiceImpl implements FollowService {
+
+    private final FollowRepository followRepository;
+    private final CompleteRepository completeRepository;
+    private final LikesRepository likesRepository;
+
+    @Transactional(readOnly = true)
+    @Override
+    public Slice<ReadFollowResponse> readFollows(int userId, ReadFollowRequest request) {
+        List<Integer> followeeIds = followRepository.findFolloweeIdsByFollowerId(userId);
+
+        Pageable pageable = PageRequest.of(0, request.size());
+
+        Slice<Complete> completes;
+        if (Objects.isNull(request.lastCompleteId()) || request.lastCompleteId() <= 0) {
+            completes = completeRepository.findByFollowees(followeeIds, pageable);
+        } else {
+            completes = completeRepository.findByFolloweesAfterCompleteId(followeeIds, request.lastCompleteId(), pageable);
+        }
+
+        List<ReadFollowResponse> responses = completes.stream()
+                .map(complete -> {
+                    Boolean likeStatus = likesRepository.existsByUser_UserIdAndComplete_CompleteId(userId, complete.getCompleteId());
+
+                    return ReadFollowResponse.from(complete, likeStatus);
+                })
+                .toList();
+
+        Integer nextCursor = completes.hasNext()
+                ? completes.getContent().get(completes.getContent().size() - 1).getCompleteId()
+                : null;
+
+        return new CustomSlice<>(responses, pageable, completes.hasNext(), nextCursor);
+    }
+}

src/main/java/com/codeit/todo/web/controller/FollowController.java

@@ -0,0 +1,35 @@
+package com.codeit.todo.web.controller;
+
+import com.codeit.todo.repository.CustomUserDetails;
+import com.codeit.todo.service.follow.FollowService;
+import com.codeit.todo.web.dto.request.follow.ReadFollowRequest;
+import com.codeit.todo.web.dto.request.todo.ReadTodoCompleteWithGoalRequest;
+import com.codeit.todo.web.dto.response.Response;
+import com.codeit.todo.web.dto.response.follow.ReadFollowResponse;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Slice;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v1/follows")
+public class FollowController {
+
+    private final FollowService followService;
+
+
+    @GetMapping
+    public Response<Slice<ReadFollowResponse>> getFollows(
+            @AuthenticationPrincipal CustomUserDetails userDetails,
+            @Valid @ModelAttribute ReadFollowRequest request
+            ) {
+
+        int userId = userDetails.getUserId();
+        return Response.ok(followService.readFollows(userId, request));
+    }
+}

src/main/java/com/codeit/todo/web/dto/request/follow/ReadFollowRequest.java

@@ -0,0 +1,12 @@
+package com.codeit.todo.web.dto.request.follow;
+
+import jakarta.validation.constraints.Min;
+import lombok.Builder;
+
+@Builder
+public record ReadFollowRequest(
+        Integer lastCompleteId,
+        @Min(1)
+        int size
+) {
+}

src/main/java/com/codeit/todo/web/dto/response/follow/ReadFollowResponse.java

@@ -0,0 +1,29 @@
+package com.codeit.todo.web.dto.response.follow;
+
+import com.codeit.todo.domain.Complete;
+import lombok.Builder;
+
+import java.time.LocalDateTime;
+
+@Builder
+public record ReadFollowResponse(
+        int completeId,
+        String completePic,
+        LocalDateTime createdAt,
+        Boolean likeStatus,
+        int likeCount,
+        int commentCount
+) {
+
+
+    public static ReadFollowResponse from(Complete complete, Boolean likeStatus) {
+        return ReadFollowResponse.builder()
+                .completeId(complete.getCompleteId())
+                .completePic(complete.getCompletePic())
+                .createdAt(complete.getCreatedAt())
+                .likeStatus(likeStatus)
+                .likeCount(complete.getLikes().size())
+                .commentCount(complete.getComments().size())
+                .build();
+    }
+}