박성주: 과제 제출

README.md

@@ -0,0 +1,7 @@
+### 구현 시 어렵거나 이해가 되지 않는 부분
+- 페이지네이션 구현 과정이 이해가 가지 않는다.
+  - 페이지네이션 구현시 클라이언트로부터 전달받아야할 파라미터의 기준을 모르겠다.
+  - 그리고 데이터를 전달받아서 서비스 계층에서 어떻게 로직을 구현해야할지 모르겠다.
+- 공통필드인 createAt, updateAt 위에 작성되는 어노테이션의 차이와 db 삽입시 생성일시, 업데이트일시가 삽입되는 일련의 과정을 모르겠다.
+  - @TimeStamp, @CreatedDate, @CreationTimestamp 의 차이와 @TimeStamp 랑 @UpdateTimestamp 의 차이를 모름.
+- 컨트롤러단에서 전역 예외처리하는 방법을 검색없이 구현하려니 어렵다.

build.gradle

@@ -31,6 +31,7 @@ dependencies {
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
 }
 
 tasks.named('test') {

src/main/java/io/sparta/board/application/dto/request/PostCreationRequestDto.java

@@ -0,0 +1,22 @@
+package io.sparta.board.application.dto.request;
+
+import io.sparta.board.domain.model.Post;
+import jakarta.validation.constraints.NotBlank;
+import lombok.Getter;
+import lombok.ToString;
+
+@ToString
+@Getter
+public class PostCreationRequestDto {
+    @NotBlank(message = "제목 입력은 필수입니다.")
+    private String title;
+    @NotBlank(message = "내용 입력은 필수입니다.")
+    private String content;
+
+    public Post toEntity() {
+        return Post.builder()
+                .title(this.title)
+                .content(this.content)
+                .build();
+    }
+}

src/main/java/io/sparta/board/application/dto/request/PostUpdateRequestDto.java

@@ -0,0 +1,27 @@
+package io.sparta.board.application.dto.request;
+
+import io.sparta.board.domain.model.Post;
+import lombok.*;
+
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+public class PostUpdateRequestDto {
+    private String title;
+    private String content;
+
+    public Post toEntity() {
+        return Post.builder()
+                .title(title)
+                .content(content)
+                .build();
+    }
+
+    public boolean isNotValid() {
+        // null, 빈 문자열, 공백으로 채워진 문자열이라면 true 를 반환하는 isBlank()
+        // title 과 content 둘 다 값이 없다면 true 를 반환한다.
+        return (this.title == null || this.title.isBlank()) && (this.content == null || this.content.isBlank());
+    }
+}

src/main/java/io/sparta/board/application/dto/response/CommentCreateResponseDto.java

@@ -0,0 +1,22 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Comment;
+import lombok.Getter;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Getter
+public class CommentCreateResponseDto {
+    private UUID id;
+    private UUID postId;
+    private String content;
+    private LocalDateTime createdAt;
+
+    public CommentCreateResponseDto(Comment comment) {
+        this.id = comment.getId();
+        this.postId = comment.getPost().getId();
+        this.content = comment.getContent();
+        this.createdAt = comment.getCreatedAt();
+    }
+
+}

src/main/java/io/sparta/board/application/dto/response/CommentUpdateResponseDto.java

@@ -0,0 +1,26 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Comment;
+import io.sparta.board.domain.model.Post;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Getter
+public class CommentUpdateResponseDto {
+    private UUID id;
+    private String content;
+    private UUID postId;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public CommentUpdateResponseDto(Comment comment) {
+        this.id = comment.getId();
+        this.content = comment.getContent();
+        this.postId = comment.getPost().getId();
+        this.createdAt = comment.getCreatedAt();
+        this.updatedAt = comment.getUpdatedAt();
+    }
+
+}

src/main/java/io/sparta/board/application/dto/response/DeleteCommentResponseDto.java

@@ -0,0 +1,26 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Comment;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Getter
+public class DeleteCommentResponseDto {
+    private UUID id;
+    private String comment;
+    private boolean deleted;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+    private UUID postId;
+
+    public DeleteCommentResponseDto(Comment comment) {
+        this.id = comment.getId();
+        this.comment = comment.getContent();
+        this.deleted = comment.isDeleted();
+        this.createdAt = comment.getCreatedAt();
+        this.updatedAt = comment.getUpdatedAt();
+        this.postId = comment.getPost().getId();
+    }
+}

src/main/java/io/sparta/board/application/dto/response/DeletePostResponseDto.java

@@ -0,0 +1,34 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Post;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Setter
+public class DeletePostResponseDto {
+    private UUID id;
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+    private boolean deleted;
+
+    public DeletePostResponseDto(Post post) {
+        this.id = post.getId();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+        // boolean 타입의 필드 값을 얻으려면 is 로 얻을 것
+        this.deleted = post.isDeleted();
+    }
+
+}

src/main/java/io/sparta/board/application/dto/response/PostCreationResponseDto.java

@@ -0,0 +1,25 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Post;
+import lombok.*;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@NoArgsConstructor
+@AllArgsConstructor
+@Setter
+@Getter
+public class PostCreationResponseDto {
+    private UUID id;
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+
+    public PostCreationResponseDto(Post post) {
+        this.id = post.getId();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.createdAt = LocalDateTime.now();
+    }
+}

src/main/java/io/sparta/board/application/dto/response/PostUpdateResponseDto.java

@@ -0,0 +1,31 @@
+package io.sparta.board.application.dto.response;
+
+
+import io.sparta.board.domain.model.Post;
+import lombok.*;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+@NoArgsConstructor
+public class PostUpdateResponseDto {
+    private UUID id;
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public PostUpdateResponseDto(Post post) {
+        this.id = post.getId();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.createdAt = post.getCreatedAt();
+        this.updatedAt = post.getUpdatedAt();
+    }
+
+
+}

src/main/java/io/sparta/board/application/dto/response/ShowPostOneResponseDto.java

@@ -0,0 +1,59 @@
+package io.sparta.board.application.dto.response;
+
+import io.sparta.board.domain.model.Comment;
+import io.sparta.board.domain.model.Post;
+import lombok.*;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+@Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
+public class ShowPostOneResponseDto {
+    private UUID id;
+    private String title;
+    private String content;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+    private boolean deleted;
+    private List<ShowCommentResponseDto> commentList = new ArrayList<>();
+
+    public ShowPostOneResponseDto(Post post) {
+        this.id = post.getId();
+        this.title = post.getTitle();
+        this.content = post.getContent();
+        this.createdAt = post.getCreatedAt();
+        this.updatedAt = post.getUpdatedAt();
+        this.deleted = post.isDeleted();
+        // *** this.commentList = post.getComments(); 이렇게 작성했더니 게시글과 댓글이 무한 참조되는 상황이 발생
+        this.commentList = makeCommentList(post.getComments());
+    }
+
+    private List<ShowCommentResponseDto> makeCommentList(List<Comment> comments) {
+        for (Comment comment : comments) this.commentList.add(new ShowCommentResponseDto(comment));
+        return this.commentList;
+    }
+
+    @Getter
+    @Setter
+    private static class ShowCommentResponseDto {
+        private UUID id;
+        private String content;
+        private LocalDateTime createdAt;
+        private LocalDateTime updatedAt;
+        private boolean deleted;
+
+        private ShowCommentResponseDto(Comment comment) {
+            this.id = comment.getId();
+            this.content = comment.getContent();
+            this.createdAt = comment.getCreatedAt();
+            this.updatedAt = comment.getUpdatedAt();
+            this.deleted = comment.isDeleted();
+        }
+    }
+
+}

src/main/java/io/sparta/board/application/service/CommentService.java

@@ -0,0 +1,75 @@
+package io.sparta.board.application.service;
+
+import io.sparta.board.application.dto.response.CommentCreateResponseDto;
+import io.sparta.board.application.dto.response.CommentUpdateResponseDto;
+import io.sparta.board.application.dto.response.DeleteCommentResponseDto;
+import io.sparta.board.domain.model.Comment;
+import io.sparta.board.domain.model.Post;
+import io.sparta.board.domain.repository.CommentRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.crossstore.ChangeSetPersister;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Map;
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class CommentService {
+    private final CommentRepository commentRepository;
+    private final PostService postService;
+
+    public CommentCreateResponseDto create(UUID postId, Map<String, String> request) {
+        // 1. 게시물 존재 여부 확인
+        Post post = postService.getPost(postId);
+
+        // 2. 클라이언트가 전달한 데이터 여부 확인
+        // isBlank() 는 빈문자열("")과 공백으로만 채워진 문자열을 검증하는 역할, isEmpty() 는 공백으로만 채워진 문자열을 필터하지 못함.
+        if(request.isEmpty() || request.get("content").isBlank()) throw new IllegalArgumentException("댓글 내용은 필수입니다.");
+
+        String content = request.get("content");
+
+        Comment comment = Comment.builder()
+                .content(content)
+                .post(post)
+                .build();
+
+        Comment saved = commentRepository.save(comment);
+        return new CommentCreateResponseDto(saved);
+    }
+
+    @Transactional
+    public CommentUpdateResponseDto update(UUID commentId, Map<String, String> request) {
+        // 1. 댓글 존재 여부 확인
+        Comment comment = getComment(commentId);
+
+        // 2. 클라이언트가 전달한 데이터 여부 확인
+        // isBlank() 는 null, 빈문자열("")과 공백으로만 채워진 문자열을 검증하는 역할, isEmpty() 는 공백으로만 채워진 문자열을 필터하지 못함.
+        // if(HashMap 타입 참조변수 == null) 이 아닌 HashMap 타입 참조변수는 isEmpty() 로 null 체크해야하는 것 같음
+        if(request.isEmpty() || request.get("content").isBlank()) throw new IllegalArgumentException("댓글 내용은 필수입니다.");
+
+        String content = request.get("content");
+
+        if(!comment.getContent().equals(content)) {
+            comment.setContent(content);
+        }
+        Comment updateComment = commentRepository.save(comment);
+        return new CommentUpdateResponseDto(updateComment);
+    }
+
+    @Transactional
+    public DeleteCommentResponseDto delete(UUID commentId) {
+        Comment comment = getComment(commentId);
+        comment.delete();
+        Comment deleteComment = commentRepository.save(comment);
+        return new DeleteCommentResponseDto(deleteComment);
+    }
+
+    // 수정과 삭제 메서드에서 댓글 존재 확인 코드가 중복되어 메서드 추출함.
+    private Comment getComment(UUID commentId) {
+        return commentRepository.findById(commentId).orElseThrow(() -> new IllegalArgumentException("해당 댓글이 존재하지 않습니다."));
+    }
+}