Feat: 게시글 저장 관련 기능 구현

src/main/java/cotato/growingpain/common/exception/ErrorCode.java

@@ -33,7 +33,8 @@ public enum ErrorCode {
     CANNOT_LIKE_OWN_POST(HttpStatus.BAD_REQUEST, "본인이 작성한 게시글은 좋아요를 누를 수 없습니다."),
     CANNOT_LIKE_OWN_COMMENT(HttpStatus.BAD_REQUEST, "본인이 작성한 댓글은 좋아요를 누를 수 없습니다."),
     CANNOT_LIKE_OWN_REPLY_COMMENT(HttpStatus.BAD_REQUEST, "본인이 작성한 답글은 좋아요를 누를 수 없습니다."),
-    ALREADY_DELETED(HttpStatus.CONFLICT, "이미 삭제되었습니다.");
+    ALREADY_DELETED(HttpStatus.CONFLICT, "이미 삭제되었습니다."),
+    ALREADY_SAVED(HttpStatus.CONFLICT, "이미 저장되었습니다.");
 
     private final HttpStatus httpStatus;
     private final String message;

src/main/java/cotato/growingpain/post/controller/PostController.java

@@ -84,4 +84,4 @@ public Response<?> deletePost(@PathVariable Long postId,
         postService.deletePost(postId, memberId);
         return Response.createSuccessWithNoData("포스트 삭제 완료");
     }
-}
+}

src/main/java/cotato/growingpain/post/controller/PostSaveController.java

@@ -0,0 +1,64 @@
+package cotato.growingpain.post.controller;
+
+import cotato.growingpain.common.Response;
+import cotato.growingpain.post.domain.entity.Post;
+import cotato.growingpain.post.service.PostSaveService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "게시글 저장", description = "게시글 저장 관련된 api")
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/post/saves")
+@Slf4j
+public class PostSaveController {
+
+    private final PostSaveService postSaveService;
+
+    @Operation(summary = "게시글 저장", description = "게시글을 저장하기 위한 메소드")
+    @ApiResponse(content = @Content(schema = @Schema(implementation = Response.class)))
+    @PostMapping("/{post-id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Response<?> savePost(@PathVariable("post-id") Long postId,
+                                @AuthenticationPrincipal Long memberId) {
+        log.info("게시글 {} 저장한 memberId: {}", postId, memberId);
+        postSaveService.savePost(postId, memberId);
+        return Response.createSuccessWithNoData("게시글 저장 완료");
+    }
+
+    @Operation(summary = "게시글 저장 취소", description = "게시글 저장을 취소하기 위한 메소드")
+    @ApiResponse(content = @Content(schema = @Schema(implementation = Response.class)))
+    @DeleteMapping("/{post-id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Response<?> deleteSavePost(@PathVariable("post-id") Long postId,
+                                      @AuthenticationPrincipal Long memberId) {
+        log.info("게시글 {} 저장 취소한 memberId: {}", postId, memberId);
+        postSaveService.deleteSavePost(postId, memberId);
+        return Response.createSuccessWithNoData("게시글 저장 취소 완료");
+    }
+
+    @Operation(summary = "저장한 게시글 목록 조회", description = "사용자가 저장한 게시글의 목록을 조회하기 위한 메소드")
+    @ApiResponse(content = @Content(schema = @Schema(implementation = Response.class)))
+    @GetMapping("/list/{member-id}")
+    @ResponseStatus(HttpStatus.OK)
+    public Response<List<Post>> getSavedPosts(@AuthenticationPrincipal Long memberId) {
+        log.info("사용자가 저장한 게시글 목록 요청: memberId {}", memberId);
+        List<Post> savedPosts = postSaveService.getSavedPosts(memberId);
+        return Response.createSuccess("저장한 게시글 목록 조회 완료", savedPosts);
+    }
+}

src/main/java/cotato/growingpain/post/domain/entity/Post.java

@@ -1,6 +1,7 @@
 package cotato.growingpain.post.domain.entity;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import cotato.growingpain.common.domain.BaseTimeEntity;
 import cotato.growingpain.common.exception.AppException;
 import cotato.growingpain.common.exception.ErrorCode;
@@ -28,6 +29,7 @@
 @Getter
 @DynamicInsert
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
+@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
 public class Post extends BaseTimeEntity {
 
     @Id

src/main/java/cotato/growingpain/post/domain/entity/PostSave.java

@@ -36,4 +36,13 @@ public class PostSave extends BaseTimeEntity {
     @JoinColumn(name = "post_id")
     @JsonIgnore
     private Post post;
+
+    public PostSave(Member member, Post post) {
+        this.member = member;
+        this.post = post;
+    }
+
+    public static PostSave createPostSave(Member member, Post post) {
+        return new PostSave(member, post);
+    }
 }

src/main/java/cotato/growingpain/post/repository/PostSaveRepository.java

@@ -0,0 +1,14 @@
+package cotato.growingpain.post.repository;
+
+import cotato.growingpain.post.domain.entity.PostSave;
+import java.util.List;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PostSaveRepository extends JpaRepository<PostSave, Long> {
+
+    boolean existsById(Long postSaveId);
+    boolean existsByMemberIdAndPostId(Long memberId, Long postId);
+    void deleteByMemberIdAndPostId(Long memberId, Long postId);
+
+    List<PostSave> findByMemberId(Long memberId);
+}

src/main/java/cotato/growingpain/post/service/PostSaveService.java

@@ -0,0 +1,60 @@
+package cotato.growingpain.post.service;
+
+import cotato.growingpain.common.exception.AppException;
+import cotato.growingpain.common.exception.ErrorCode;
+import cotato.growingpain.member.domain.entity.Member;
+import cotato.growingpain.member.repository.MemberRepository;
+import cotato.growingpain.post.domain.entity.Post;
+import cotato.growingpain.post.domain.entity.PostSave;
+import cotato.growingpain.post.repository.PostRepository;
+import cotato.growingpain.post.repository.PostSaveRepository;
+import java.util.List;
+import java.util.stream.Collectors;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class PostSaveService {
+
+    private final MemberRepository memberRepository;
+    private final PostRepository postRepository;
+    private final PostSaveRepository postSaveRepository;
+
+    @Transactional
+    public void savePost(Long postId, Long memberId) {
+        Member member = memberRepository.findById(memberId)
+                .orElseThrow(() -> new AppException(ErrorCode.MEMBER_NOT_FOUND));
+        Post post = postRepository.findById(postId)
+                .orElseThrow(() -> new AppException(ErrorCode.POST_NOT_FOUND));
+
+        if (postSaveRepository.existsByMemberIdAndPostId(memberId, postId)) {
+            throw new AppException(ErrorCode.ALREADY_SAVED);
+        }
+
+        PostSave postSave = PostSave.createPostSave(member, post);
+        postSaveRepository.save(postSave);
+    }
+
+    @Transactional
+    public void deleteSavePost(Long postId, Long memberId) {
+
+        if (!postSaveRepository.existsByMemberIdAndPostId(postId, memberId)) {
+            throw new AppException(ErrorCode.POST_NOT_FOUND);
+        }
+
+        postSaveRepository.deleteByMemberIdAndPostId(memberId, postId);
+    }
+
+    @Transactional
+    public List<Post> getSavedPosts(Long memberId) {
+        List<PostSave> postSaves = postSaveRepository.findByMemberId(memberId);
+
+        return postSaves.stream()
+                .map(PostSave::getPost)
+                .collect(Collectors.toList());
+    }
+}