feat: 백문백답 삭제 API를 구현한다.

src/main/java/com/dnd/accompany/domain/qna100/api/QnaController.java

@@ -2,13 +2,15 @@
 
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.DeleteMapping;
 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;
 
 import com.dnd.accompany.domain.auth.dto.jwt.JwtAuthentication;
 import com.dnd.accompany.domain.qna100.api.dto.CreateAndUpdateQnaRequest;
+import com.dnd.accompany.domain.qna100.api.dto.DeleteQnaRequest;
 import com.dnd.accompany.domain.qna100.service.QnaService;
 
 import io.swagger.v3.oas.annotations.Operation;
@@ -32,4 +34,13 @@ public ResponseEntity<Void> createAndUpdate(
 		qnaService.saveAndUpdate(user.getId(), request);
 		return ResponseEntity.ok().build();
 	}
+
+	@Operation(summary = "백문백답 삭제")
+	@DeleteMapping
+	public ResponseEntity<Void> delete(
+		@RequestBody @Valid DeleteQnaRequest request,
+		@AuthenticationPrincipal JwtAuthentication user) {
+		qnaService.delete(user.getId(), request);
+		return ResponseEntity.ok().build();
+	}
 }

src/main/java/com/dnd/accompany/domain/qna100/api/dto/DeleteQnaRequest.java

@@ -0,0 +1,8 @@
+package com.dnd.accompany.domain.qna100.api.dto;
+
+import java.util.List;
+
+public record DeleteQnaRequest(
+	List<Long> ids
+) {
+}

src/main/java/com/dnd/accompany/domain/qna100/infrastructure/QnaRepository.java

@@ -1,5 +1,8 @@
 package com.dnd.accompany.domain.qna100.infrastructure;
 
+import java.util.List;
+import java.util.Optional;
+
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
@@ -8,5 +11,6 @@
 
 @Repository
 public interface QnaRepository extends JpaRepository<Qna100, Long>, QnaRepositoryCustom {
-	void deleteAllByUserId(Long userId);
+	Optional<Qna100> findFirstByUserId(Long userId);
+	void deleteByIdIn(List<Long> ids);
 }

src/main/java/com/dnd/accompany/domain/qna100/service/QnaService.java

@@ -6,12 +6,17 @@
 import java.util.Map;
 import java.util.function.Function;
 
+import org.springframework.data.domain.Example;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import com.dnd.accompany.domain.qna100.api.dto.CreateAndUpdateQnaRequest;
+import com.dnd.accompany.domain.qna100.api.dto.DeleteQnaRequest;
 import com.dnd.accompany.domain.qna100.entity.Qna100;
+import com.dnd.accompany.domain.qna100.exception.Qna100AccessDeniedException;
+import com.dnd.accompany.domain.qna100.exception.Qna100NotFoundException;
 import com.dnd.accompany.domain.qna100.infrastructure.QnaRepository;
+import com.dnd.accompany.global.common.response.ErrorCode;
 
 import lombok.RequiredArgsConstructor;
 
@@ -41,4 +46,16 @@ public void saveAndUpdate(Long userId, CreateAndUpdateQnaRequest request) {
 
 		qnaRepository.saveAll(newQnas);
 	}
+
+	@Transactional
+	public void delete(Long userId, DeleteQnaRequest request) {
+		Qna100 qna = qnaRepository.findFirstByUserId(userId)
+			.orElseThrow(() -> new Qna100NotFoundException(ErrorCode.QNA100_NOT_FOUND));
+
+		if(!userId.equals(qna.getUserId())){
+			throw new Qna100AccessDeniedException(ErrorCode.QNA100_ACCESS_DENIED);
+		}
+
+		qnaRepository.deleteByIdIn(request.ids());
+	}
 }