[FEAT] 질문 생성 API 구현

src/main/java/com/moongeul/backend/api/question/controller/QuestionController.java

@@ -0,0 +1,45 @@
+package com.moongeul.backend.api.question.controller;
+
+import com.moongeul.backend.api.question.dto.QuestionCreateRequestDTO;
+import com.moongeul.backend.api.question.dto.QuestionIdResponseDTO;
+import com.moongeul.backend.api.question.service.QuestionService;
+import com.moongeul.backend.common.response.ApiResponse;
+import com.moongeul.backend.common.response.SuccessStatus;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "Question", description = "Question(질문) 관련 API 입니다.")
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/v2/question")
+public class QuestionController {
+
+    private final QuestionService questionService;
+
+    @Operation(
+            summary = "질문 생성 API",
+            description = "질문을 생성하는 API 입니다."
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "질문 생성 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "400", description = "질문 작성은 필수입니다"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "404", description = "해당 도서를 찾을 수 없습니다.")
+    })
+    @PostMapping("/create")
+    public ResponseEntity<ApiResponse<QuestionIdResponseDTO>> createQuestion(@AuthenticationPrincipal UserDetails userDetails,
+                                                                         @Valid @RequestBody QuestionCreateRequestDTO questionCreateRequestDTO) {
+
+        QuestionIdResponseDTO response = questionService.createQuestion(questionCreateRequestDTO, userDetails.getUsername());
+        return ApiResponse.success(SuccessStatus.CREATE_QUESTION_SUCCESS, response);
+    }
+}

src/main/java/com/moongeul/backend/api/question/dto/QuestionCreateRequestDTO.java

@@ -0,0 +1,32 @@
+package com.moongeul.backend.api.question.dto;
+
+import com.moongeul.backend.api.book.entity.Book;
+import com.moongeul.backend.api.member.entity.Member;
+import com.moongeul.backend.api.question.entity.Question;
+import jakarta.validation.constraints.NotBlank;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class QuestionCreateRequestDTO {
+
+    @NotBlank(message = "ISBN은 필수입니다")
+    private String isbn; // 책
+
+    @NotBlank(message = "질문 작성은 필수입니다")
+    private String content; // 질문
+
+    public Question toEntity(Member member, Book book){
+        return Question.builder()
+                .content(this.content)
+                .commentCnt(0)
+                .member(member)
+                .book(book)
+                .build();
+    }
+}

src/main/java/com/moongeul/backend/api/question/dto/QuestionIdResponseDTO.java

@@ -0,0 +1,15 @@
+package com.moongeul.backend.api.question.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class QuestionIdResponseDTO {
+
+    private Long questionId; // 생성된 Question id
+}

src/main/java/com/moongeul/backend/api/question/entity/Question.java

@@ -0,0 +1,34 @@
+package com.moongeul.backend.api.question.entity;
+
+import com.moongeul.backend.api.book.entity.Book;
+import com.moongeul.backend.api.member.entity.Member;
+import com.moongeul.backend.common.entity.BaseTimeEntity;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@Builder // 빌더 패턴 사용을 위한 롬복 애너테이션
+@NoArgsConstructor // 기본 생성자
+@AllArgsConstructor // 모든 필드를 포함한 생성자
+@Table(name = "QUESTION") // 데이터베이스 테이블 이름 지정
+public class Question extends BaseTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id; // 게시글 id
+
+    private String content; // 질문 내용
+    private Integer commentCnt; // 댓글 개수
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "member_id", nullable = false)
+    private Member member;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "book_isbn", nullable = false)
+    private Book book;
+}

src/main/java/com/moongeul/backend/api/question/repository/QuestionRepository.java

@@ -0,0 +1,7 @@
+package com.moongeul.backend.api.question.repository;
+
+import com.moongeul.backend.api.question.entity.Question;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface QuestionRepository extends JpaRepository<Question, Long>  {
+}

src/main/java/com/moongeul/backend/api/question/service/QuestionService.java

@@ -0,0 +1,42 @@
+package com.moongeul.backend.api.question.service;
+
+import com.moongeul.backend.api.book.entity.Book;
+import com.moongeul.backend.api.book.repository.BookRepository;
+import com.moongeul.backend.api.member.entity.Member;
+import com.moongeul.backend.api.member.repository.MemberRepository;
+import com.moongeul.backend.api.question.dto.QuestionCreateRequestDTO;
+import com.moongeul.backend.api.question.dto.QuestionIdResponseDTO;
+import com.moongeul.backend.api.question.entity.Question;
+import com.moongeul.backend.api.question.repository.QuestionRepository;
+import com.moongeul.backend.common.exception.NotFoundException;
+import com.moongeul.backend.common.response.ErrorStatus;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class QuestionService {
+
+    private final MemberRepository memberRepository;
+    private final BookRepository bookRepository;
+    private final QuestionRepository questionRepository;
+
+    /* 질문 생성 */
+    public QuestionIdResponseDTO createQuestion(QuestionCreateRequestDTO questionCreateRequestDTO, String email){
+
+        Member member = memberRepository.findByEmail(email)
+                .orElseThrow(() -> new NotFoundException(ErrorStatus.USER_NOTFOUND_EXCEPTION.getMessage()));
+
+        Book book = bookRepository.findByIsbn(questionCreateRequestDTO.getIsbn())
+                .orElseThrow(() -> new NotFoundException(ErrorStatus.BOOK_NOTFOUND_EXCEPTION.getMessage()));
+
+        Question newQuestion = questionCreateRequestDTO.toEntity(member, book);
+        Question savedQuestion = questionRepository.save(newQuestion);
+
+        return QuestionIdResponseDTO.builder()
+                .questionId(savedQuestion.getId())
+                .build();
+    }
+}

src/main/java/com/moongeul/backend/common/response/SuccessStatus.java

@@ -40,6 +40,9 @@ public enum SuccessStatus {
 	CREATE_CATEGORY_SUCCESS(HttpStatus.OK, "카테고리 생성 성공"),
 	GET_CATEGORY_SUCCESS(HttpStatus.OK, "카테고리 전체 조회 성공"),
 
+	/* QUESTION */
+	CREATE_QUESTION_SUCCESS(HttpStatus.OK, "질문 생성 성공"),
+
 	/**
 	 * 201
 	 */