3주차 심화과제

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/controller/PostController.java

@@ -0,0 +1,45 @@
+package sopt.org.ThirdSeminar.controller;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+import sopt.org.ThirdSeminar.common.dto.ApiResponseDto;
+import sopt.org.ThirdSeminar.controller.dto.request.PostRequestDto;
+import sopt.org.ThirdSeminar.controller.dto.response.PostResponseDto;
+import sopt.org.ThirdSeminar.exception.ErrorStatus;
+import sopt.org.ThirdSeminar.exception.SuccessStatus;
+import sopt.org.ThirdSeminar.exception.UserNotFoundException;
+import sopt.org.ThirdSeminar.service.PostService;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/post")
+public class PostController {
+
+    private final PostService postService;
+
+    //게시물 생성
+    @PostMapping("")
+    @ResponseStatus(HttpStatus.CREATED)
+    public ApiResponseDto<PostResponseDto> createPost(@RequestBody final PostRequestDto request) {
+        try {
+            return ApiResponseDto.success(SuccessStatus.CREATE_POST_SUCCESS, postService.createPost(request));
+        } catch (UserNotFoundException e) {
+            return ApiResponseDto.error(ErrorStatus.USER_NOT_FOUND);
+        }
+    }
+
+    //유저아이디로 게시물 조회
+    @GetMapping("/{userId}")
+    public ApiResponseDto<List<PostResponseDto>> getPostByUserId(@PathVariable final int userId) {
+        return ApiResponseDto.success(SuccessStatus.READ_ALL_POST, postService.getPostByUserId((long) userId));
+    }
+
+    //제목으로 게시물 조회
+    @GetMapping("")
+    public ApiResponseDto<List<PostResponseDto>> getPostByTitle(@RequestParam final String title) {
+        return ApiResponseDto.success(SuccessStatus.READ_ALL_POST, postService.getPostByTitle(title));
+    }
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/controller/UserController.java

@@ -20,6 +20,7 @@ public class UserController {
 
     private final UserService userService;
 
+    //* 유저 생성
     @PostMapping("/user/signup")
     @ResponseStatus(HttpStatus.CREATED)
     public ApiResponseDto<UserResponseDto> create(@RequestBody @Valid final UserRequestDto request) {

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/controller/dto/request/PostRequestDto.java

@@ -0,0 +1,15 @@
+package sopt.org.ThirdSeminar.controller.dto.request;
+
+import lombok.Getter;
+
+import javax.validation.constraints.NotNull;
+
+@Getter
+public class PostRequestDto {
+    @NotNull
+    private Long userId;
+    @NotNull
+    private String title;
+    private String content;
+
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/controller/dto/response/PostResponseDto.java

@@ -0,0 +1,17 @@
+package sopt.org.ThirdSeminar.controller.dto.response;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+public class PostResponseDto {
+    private Long postId;
+    private String title;
+    private String content;
+
+    public static PostResponseDto of(Long postId, String title, String content) {
+        return new PostResponseDto(postId, title, content);
+    }
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/domain/Post.java

@@ -0,0 +1,35 @@
+package sopt.org.ThirdSeminar.domain;
+
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class Post {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    @Column(nullable = false)
+    private String title;
+    //@Column 생략 가능
+    private String content;
+    private LocalDateTime createdAt;
+
+    @Builder
+    public Post(String title, String content, User user) {
+        this.title = title;
+        this.content = content;
+        this.user = user;
+        this.createdAt = LocalDateTime.now();
+    }
+
+    @ManyToOne(fetch = FetchType.LAZY) //다대일(N:1) 관계
+    @JoinColumn(name = "user_id") //외래키 매핑
+    private User user;
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/domain/User.java

@@ -1,26 +1,37 @@
 package sopt.org.ThirdSeminar.domain;
 
-import lombok.*;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
 import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
 @Entity
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 public class User {
-
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "user_id")
     private Long id;
     @Column(nullable = false)
     private String nickname;
     @Column(nullable = false)
     private String email;
     @Column(nullable = false)
     private String password;
+
     @Builder
     public User(String nickname, String email, String password) {
         this.nickname = nickname;
         this.email = email;
         this.password = password;
     }
 
+    //mappedBy 양방향 연관관계 주인 user x -> post(외래키를 가진 쪽)
+    @OneToMany(mappedBy = "user") //일대다(1:N)
+    private final List<Post> posts = new ArrayList<>();
 }

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/exception/ErrorStatus.java

@@ -26,6 +26,11 @@ public enum ErrorStatus {
     INTERNAL_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "예상치 못한 서버 에러가 발생했습니다."),
     BAD_GATEWAY_EXCEPTION(HttpStatus.BAD_GATEWAY, "일시적인 에러가 발생하였습니다.\n잠시 후 다시 시도해주세요!"),
     SERVICE_UNAVAILABLE_EXCEPTION(HttpStatus.SERVICE_UNAVAILABLE, "현재 점검 중입니다.\n잠시 후 다시 시도해주세요!"),
+
+    /*
+    User
+     */
+    USER_NOT_FOUND(HttpStatus.NOT_FOUND, "유저가 존재하지 않습니다."),
     ;
 
     private final HttpStatus httpStatus;

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/exception/SuccessStatus.java

@@ -11,7 +11,13 @@ public enum SuccessStatus {
     /*
     user
     */
-    SIGNUP_SUCCESS(HttpStatus.CREATED, "회원가입이 완료되었습니다."),
+    SIGNUP_SUCCESS(HttpStatus.CREATED, "유저 생성 성공"),
+
+    /*
+    post
+     */
+    CREATE_POST_SUCCESS(HttpStatus.CREATED, "게시물 작성 성공"),
+    READ_ALL_POST(HttpStatus.OK, "게시물 조회 성공"),
     ;
 
     private final HttpStatus httpStatus;

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/exception/UserNotFoundException.java

@@ -0,0 +1,7 @@
+package sopt.org.ThirdSeminar.exception;
+
+public class UserNotFoundException extends RuntimeException {
+    public UserNotFoundException() {
+        super();
+    }
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/infrastructure/PostRepository.java

@@ -0,0 +1,14 @@
+package sopt.org.ThirdSeminar.infrastructure;
+
+import org.springframework.data.repository.Repository;
+import sopt.org.ThirdSeminar.domain.Post;
+
+import java.util.List;
+
+public interface PostRepository extends Repository<Post, Long> {
+    void save(Post post);
+
+    List<Post> findAllByUserId(Long userId);
+
+    List<Post> findAllByTitle(String title);
+}

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/infrastructure/UserRepository.java

@@ -5,4 +5,6 @@
 
 public interface UserRepository extends Repository<User, Long> {
     void save(User user);
+
+    User findById(Long id);
 }

ThirdSeminar/src/main/java/sopt/org/ThirdSeminar/service/PostService.java

@@ -0,0 +1,56 @@
+package sopt.org.ThirdSeminar.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import sopt.org.ThirdSeminar.controller.dto.request.PostRequestDto;
+import sopt.org.ThirdSeminar.controller.dto.response.PostResponseDto;
+import sopt.org.ThirdSeminar.domain.Post;
+import sopt.org.ThirdSeminar.domain.User;
+import sopt.org.ThirdSeminar.exception.UserNotFoundException;
+import sopt.org.ThirdSeminar.infrastructure.PostRepository;
+import sopt.org.ThirdSeminar.infrastructure.UserRepository;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor //final이 붙거나 @NotNull 이 붙은 필드의 생성자를 자동 생성
+public class PostService {
+
+    private final UserRepository userRepository;
+    private final PostRepository postRepository;
+
+    @Transactional //일련의 작업을 하나로 묶어서 처리 -> 오류가 발생했을 때 모든 작업들을 원상태로 되돌릴 수 있음
+    public PostResponseDto createPost(PostRequestDto request) {
+        final Optional<User> user = Optional.ofNullable(userRepository.findById(request.getUserId()));
+        user.orElseThrow(UserNotFoundException::new);
+
+        Post post = Post.builder()
+                .title(request.getTitle())
+                .content(request.getContent())
+                .user(user.get())
+                .build();
+
+        postRepository.save(post);
+
+        return PostResponseDto.of(post.getId(), post.getTitle(), post.getContent());
+    }
+
+    public List<PostResponseDto> getPostByUserId(final Long userId) {
+        final List<PostResponseDto> postList = new ArrayList<>();
+        postRepository.findAllByUserId(userId).forEach((p) ->
+                postList.add(PostResponseDto.of(p.getId(), p.getTitle(), p.getContent()))
+        );
+        return postList;
+    }
+
+    public List<PostResponseDto> getPostByTitle(final String title) {
+        final List<PostResponseDto> postList = new ArrayList<>();
+        postRepository.findAllByTitle(title).forEach((p) ->
+                postList.add(PostResponseDto.of(p.getId(), p.getTitle(), p.getContent()))
+        );
+        return postList;
+    }
+}