[feat/3] 친구 추가, 친구 삭제, 친구 목록 조회

src/main/java/com/umc/dream/apiPayload/ApiResponse.java

@@ -5,7 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
-import umc.spring.apiPayload.code.status.SuccessStatus;
+import com.umc.dream.apiPayload.code.status.SuccessStatus;
 
 @Getter
 @AllArgsConstructor

src/main/java/com/umc/dream/apiPayload/code/status/SuccessStatus.java

@@ -3,8 +3,8 @@
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import org.springframework.http.HttpStatus;
-import umc.spring.apiPayload.code.BaseCode;
-import umc.spring.apiPayload.code.ReasonDTO;
+import com.umc.dream.apiPayload.code.BaseCode;
+import com.umc.dream.apiPayload.code.ReasonDTO;
 
 @Getter
 @AllArgsConstructor

src/main/java/com/umc/dream/controller/FollowController.java

@@ -0,0 +1,39 @@
+package com.umc.dream.controller;
+
+import com.umc.dream.apiPayload.ApiResponse;
+import com.umc.dream.converter.FollowConverter;
+import com.umc.dream.domain.Follow;
+import com.umc.dream.dto.FollowRequestDto;
+import com.umc.dream.dto.FollowResponseDto;
+import com.umc.dream.dto.ViewFollowResponseDto;
+import com.umc.dream.service.FollowService;
+import lombok.AllArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@AllArgsConstructor
+public class FollowController {
+
+    private final FollowService followService;
+
+    @PostMapping("/user/follow")
+    public ApiResponse<FollowResponseDto> follow(@RequestBody FollowRequestDto followRequestDto) {
+        Follow f = followService.follow(followRequestDto);
+        FollowResponseDto followResponseDto = FollowConverter.toFollowResponse(f);
+        return ApiResponse.onSuccess(followResponseDto);
+    }
+
+    @DeleteMapping("/user/followCancel")
+    public ApiResponse<?> followCancel(@RequestBody FollowRequestDto followRequestDto) {
+        followService.followCancel(followRequestDto);
+        return ApiResponse.onSuccess("팔로우 취소됨");
+    }
+
+    @GetMapping("/user/{user_id}/following")
+    public ApiResponse<List<ViewFollowResponseDto>> viewFollowings(@PathVariable Long user_id) {
+        List<ViewFollowResponseDto> viewFollowResponseDtos = followService.viewFollowings(user_id);
+        return ApiResponse.onSuccess(viewFollowResponseDtos);
+    }
+}

src/main/java/com/umc/dream/converter/FollowConverter.java

@@ -0,0 +1,13 @@
+package com.umc.dream.converter;
+
+import com.umc.dream.domain.Follow;
+import com.umc.dream.dto.FollowResponseDto;
+
+public class FollowConverter {
+
+    public static FollowResponseDto toFollowResponse(Follow follow) {
+        return FollowResponseDto.builder()
+                .updatedAt(follow.getFollower().getLastModifiedDate())
+                .build();
+    }
+}

src/main/java/com/umc/dream/dto/FollowRequestDto.java

@@ -0,0 +1,19 @@
+package com.umc.dream.dto;
+
+import com.umc.dream.domain.Follow;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+public class FollowRequestDto {
+    private Long followerId;
+    private Long acceptorId;
+
+    @Builder
+    public FollowRequestDto(Follow follow) {
+        this.followerId = follow.getFollower().getId();
+        this.acceptorId = follow.getAcceptor().getId();
+    }
+}

src/main/java/com/umc/dream/dto/FollowResponseDto.java

@@ -0,0 +1,16 @@
+package com.umc.dream.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Builder
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class FollowResponseDto {
+    private LocalDateTime updatedAt;
+}

src/main/java/com/umc/dream/dto/ViewFollowResponseDto.java

@@ -0,0 +1,15 @@
+package com.umc.dream.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Builder
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class ViewFollowResponseDto {
+    private Long userId;
+    private String name;
+}

src/main/java/com/umc/dream/repository/FollowRepository.java

@@ -0,0 +1,13 @@
+package com.umc.dream.repository;
+
+import com.umc.dream.domain.Follow;
+import com.umc.dream.domain.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+public interface FollowRepository extends JpaRepository<Follow, Long> {
+    List<Follow> findAllByFollower_Id(Long memberId);
+
+    Follow findByFollowerAndAcceptor(User follower, User acceptor);
+}

src/main/java/com/umc/dream/repository/UserRepository.java

@@ -0,0 +1,7 @@
+package com.umc.dream.repository;
+
+import com.umc.dream.domain.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+}

src/main/java/com/umc/dream/service/FollowService.java

@@ -0,0 +1,62 @@
+package com.umc.dream.service;
+
+import com.umc.dream.apiPayload.code.status.ErrorStatus;
+import com.umc.dream.apiPayload.exception.GeneralException;
+import com.umc.dream.domain.Follow;
+import com.umc.dream.domain.User;
+import com.umc.dream.dto.FollowRequestDto;
+import com.umc.dream.dto.ViewFollowResponseDto;
+import com.umc.dream.repository.FollowRepository;
+import com.umc.dream.repository.UserRepository;
+import jakarta.transaction.Transactional;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class FollowService {
+
+    private final FollowRepository followRepository;
+    private final UserRepository userRepository;
+    @Transactional
+    public Follow follow(FollowRequestDto followRequestDto) {
+        User follower = userRepository.findById(followRequestDto.getFollowerId())
+                .orElseThrow(() -> new GeneralException(ErrorStatus._BAD_REQUEST));
+        User acceptor = userRepository.findById(followRequestDto.getAcceptorId())
+                .orElseThrow(() -> new GeneralException(ErrorStatus._BAD_REQUEST));
+        Follow f = Follow.builder()
+                .follower(follower)
+                .acceptor(acceptor)
+                .build();
+        followRepository.save(f);
+        return f;
+    }
+
+    @Transactional
+    public void followCancel(FollowRequestDto followRequestDto) {
+        User follower = userRepository.findById(followRequestDto.getFollowerId())
+                .orElseThrow(() -> new GeneralException(ErrorStatus._BAD_REQUEST));
+        User acceptor = userRepository.findById(followRequestDto.getAcceptorId())
+                .orElseThrow(() -> new GeneralException(ErrorStatus._BAD_REQUEST));
+        Follow f = followRepository.findByFollowerAndAcceptor(follower,acceptor);
+        followRepository.delete(f);
+    }
+
+    @Transactional
+    public List<ViewFollowResponseDto> viewFollowings(Long memberId) {
+        List<Follow> follows = followRepository.findAllByFollower_Id(memberId);
+        List<ViewFollowResponseDto> viewFollowResponseDtos = new ArrayList<>();
+        for(Follow follow : follows) {
+            User user = follow.getAcceptor();
+            ViewFollowResponseDto viewFollowResponseDto = ViewFollowResponseDto.builder()
+                    .userId(user.getId())
+                    .name(user.getName())
+                    .build();
+            viewFollowResponseDtos.add(viewFollowResponseDto);
+        }
+        return viewFollowResponseDtos;
+    }
+}