[4기 강병곤, 최준혁] Spring Boot JPA 게시판 구현 미션 제출합니다.

hehe-board/src/main/java/com/programmers/heheboard/domain/post/CreatePostRequestDto.java

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+package com.programmers.heheboard.domain.post;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class CreatePostRequestDto {
+	private String title;
+	private String content;
+	private Long userId;
+
+	public Post toEntity() {
+		return Post.builder()
+			.title(title)
+			.content(content)
+			.build();
+	}
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/Post.java

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+package com.programmers.heheboard.domain.post;
+
+import java.util.Objects;
+
+import com.programmers.heheboard.domain.user.User;
+import com.programmers.heheboard.global.BaseEntity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.Lob;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Table(name = "posts")
+@Entity
+@Getter
+@NoArgsConstructor
+public class Post extends BaseEntity {
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private Long id;
+
+	@Column(nullable = false)
+	private String title;
+
+	@Lob
+	private String content;
+
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "user_id")
+	private User user;
+
+	@Builder
+	public Post(String title, String content) {
+		this.title = title;
+		this.content = content;
+	}
+
+	public void setUser(User user) {
+		if (Objects.nonNull(this.user)) {
+			this.user.getPosts().remove(this);
+		}
+
+		this.user = user;
+		user.getPosts().add(this);
+	}
+
+	public void changeTitle(String newTitle) {
+		this.title = newTitle;
+	}
+
+	public void changeContents(String newContent) {
+		this.content = newContent;
+	}
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/PostController.java

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+package com.programmers.heheboard.domain.post;
+
+import org.springframework.data.domain.Slice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+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.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.programmers.heheboard.global.ApiResponse;
+
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping(value = "/posts")
+public class PostController {
+
+	private final PostService postService;
+
+	@ExceptionHandler(Exception.class)
+	public ApiResponse<String> internalServerErrorHandler(Exception e) {
+		return ApiResponse.fail(500, e.getMessage());
+	}
+
+	@PostMapping
+	public ApiResponse<PostResponseDTO> save(@RequestBody CreatePostRequestDto createPostRequestDto) {
+		PostResponseDTO postDto = postService.createPost(createPostRequestDto);
+		return ApiResponse.ok(postDto);
+	}
+
+	@PutMapping("/{post-id}")
+	public ApiResponse<PostResponseDTO> updatePost(@RequestBody UpdatePostRequestDto updatePostRequestDto,
+		@PathVariable("post-id") Long postId) {
+		PostResponseDTO postResponseDTO = postService.updatePost(postId, updatePostRequestDto);
+		return ApiResponse.ok(postResponseDTO);
+	}
+
+	@GetMapping("/{post-id}")
+	public ApiResponse<PostResponseDTO> getOnePost(@PathVariable("post-id") Long postId) {
+		PostResponseDTO postDto = postService.findPost(postId);
+		return ApiResponse.ok(postDto);
+	}
+
+	@GetMapping
+	public ApiResponse<Slice<PostResponseDTO>> getAllPost(@RequestParam int page, @RequestParam int size) {
+		Slice<PostResponseDTO> posts = postService.getPosts(page, size);
+		return ApiResponse.ok(posts);
+	}
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/PostRepository.java

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+package com.programmers.heheboard.domain.post;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PostRepository extends JpaRepository<Post, Long> {
+
+	Slice<Post> findSliceBy(Pageable pageable);
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/PostResponseDTO.java

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+package com.programmers.heheboard.domain.post;
+
+import java.time.LocalDateTime;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class PostResponseDTO {
+	private String title;
+	private String content;
+	private LocalDateTime createdAt;
+	private LocalDateTime modifiedAt;
+
+	@Builder
+	public PostResponseDTO(String title, String content, LocalDateTime createdAt, LocalDateTime modifiedAt) {
+		this.title = title;
+		this.content = content;
+		this.createdAt = createdAt;
+		this.modifiedAt = modifiedAt;
+	}
+
+	public static PostResponseDTO toResponse(Post post) {
+		return PostResponseDTO.builder()
+			.title(post.getTitle())
+			.content(post.getContent())
+			.createdAt(post.getCreatedAt())
+			.modifiedAt(post.getModifiedAt())
+			.build();
+	}
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/PostService.java

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+package com.programmers.heheboard.domain.post;
+
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Slice;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.programmers.heheboard.domain.user.User;
+import com.programmers.heheboard.domain.user.UserRepository;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class PostService {
+	private final UserRepository userRepository;
+	private final PostRepository postRepository;
+
+	@Transactional
+	public PostResponseDTO createPost(CreatePostRequestDto createPostRequestDto) {
+		Post post = createPostRequestDto.toEntity();
+		User user = userRepository.findById(createPostRequestDto.getUserId())
+			.orElseThrow(() -> new RuntimeException("User Not Found!"));
+
+		post.setUser(user);
+
+		return PostResponseDTO.toResponse(postRepository.save(post));
+	}
+
+	@Transactional
+	public PostResponseDTO findPost(Long postId) {
+		Post retrievedPost = postRepository.findById(postId)
+			.orElseThrow(() -> new RuntimeException("Post Not Found!"));
+
+		return PostResponseDTO.toResponse(retrievedPost);
+	}
+
+	@Transactional
+	public Slice<PostResponseDTO> getPosts(int page, int size) {
+		PageRequest pageRequest = PageRequest.of(page, size);
+
+		return postRepository.findSliceBy(pageRequest)
+			.map(PostResponseDTO::toResponse);
+	}
+
+	@Transactional
+	public PostResponseDTO updatePost(Long postId, UpdatePostRequestDto updatePostRequestDto) {
+		Post retrievedPost = postRepository.findById(postId)
+			.orElseThrow(() -> new RuntimeException("Post Not Found!"));
+
+		retrievedPost.changeTitle(updatePostRequestDto.getTitle());
+		retrievedPost.changeContents(updatePostRequestDto.getContent());
+
+		return PostResponseDTO.toResponse(retrievedPost);
+	}
+}

hehe-board/src/main/java/com/programmers/heheboard/domain/post/UpdatePostRequestDto.java

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+package com.programmers.heheboard.domain.post;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class UpdatePostRequestDto {
+	private String title;
+	private String content;
+}