[DEV-262/BE] feat: 질답 세트를 스크랩하는 API 개발

backend/src/main/java/com/shyashyashya/refit/domain/qnaset/api/QnaSetController.java

@@ -86,8 +86,8 @@ public ResponseEntity<ApiResponse<Void>> updateQnaSet(
     @DeleteMapping("/{qnaSetId}")
     public ResponseEntity<ApiResponse<Void>> deleteQnaSet(@PathVariable Long qnaSetId) {
         qnaSetService.deleteQnaSet(qnaSetId);
-        var resposne = ApiResponse.success(COMMON204);
-        return ResponseEntity.ok(resposne);
+        var response = ApiResponse.success(COMMON204);
+        return ResponseEntity.ok(response);
     }
 
     @Operation(

backend/src/main/java/com/shyashyashya/refit/domain/qnaset/service/QnaSetService.java

@@ -137,6 +137,7 @@ public Page<QnaSetScrapFolderResponse> getMyScrapFoldersWithQnaSetContainingInfo
         return qnaSetScrapFolderRepository.findAllScrapFoldersWithQnaSetContainingInfo(requestUser, qnaSet, pageable);
     }
 
+    // TODO: ID->Entity 변환기 별도로 분리 고려
     private QnaSet getValidatedQnaSet(Long qnaSetId) {
         QnaSet qnaSet = qnaSetRepository.findById(qnaSetId).orElseThrow(() -> new CustomException(QNA_SET_NOT_FOUND));
         User requestUser = requestUserContext.getRequestUser();

backend/src/main/java/com/shyashyashya/refit/domain/scrapfolder/api/ScrapFolderController.java

@@ -23,6 +23,7 @@
 import org.springframework.web.bind.annotation.PatchMapping;
 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.RestController;
@@ -83,4 +84,24 @@ public ResponseEntity<ApiResponse<Void>> updateScrapFolderName(
         var response = ApiResponse.success(COMMON200);
         return ResponseEntity.ok(response);
     }
+
+    // TODO: Integration Test 작성 필요
+    @Operation(summary = "주어진 스크랩 폴더에 지정한 질문 답변 세트를 추가합니다.", description = "이미 추가된 상태인 경우 아무 일도 발생하지 않습니다.")
+    @PutMapping("{scrapFolderId}/qna-set/{qnaSetId}")
+    public ResponseEntity<ApiResponse<Void>> addQnaSetToScrapFolder(
+            @PathVariable Long qnaSetId, @PathVariable Long scrapFolderId) {
+        scrapFolderService.addQnaSetToScrapFolder(qnaSetId, scrapFolderId);
+        var response = ApiResponse.success(COMMON200);
+        return ResponseEntity.ok(response);
+    }
+
+    // TODO: Integration Test 작성 필요
+    @Operation(summary = "주어진 스크랩 폴더에서 지정한 질문 답변 세트를 제거합니다.", description = "이미 제거된 상태인 경우 아무 일도 발생하지 않습니다.")
+    @DeleteMapping("{scrapFolderId}/qna-set/{qnaSetId}")
+    public ResponseEntity<ApiResponse<Void>> removeQnaSetFromScrapFolder(
+            @PathVariable Long qnaSetId, @PathVariable Long scrapFolderId) {
+        scrapFolderService.removeQnaSetFromScrapFolder(qnaSetId, scrapFolderId);
+        var response = ApiResponse.success(COMMON204);
+        return ResponseEntity.ok(response);
+    }
 }

backend/src/main/java/com/shyashyashya/refit/domain/scrapfolder/model/QnaSetScrapFolder.java

@@ -11,13 +11,19 @@
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.Table;
+import jakarta.persistence.UniqueConstraint;
 import lombok.AccessLevel;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 
 @Entity
-@Table(name = "qna_sets_scrap_folders")
+@Table(
+        name = "qna_sets_scrap_folders",
+        uniqueConstraints =
+                @UniqueConstraint(
+                        name = "uk_qna_set_scrap_folder",
+                        columnNames = {"qna_set_id", "scrap_folder_id"}))
 @Getter
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 public class QnaSetScrapFolder extends BaseEntity {

backend/src/main/java/com/shyashyashya/refit/domain/scrapfolder/repository/QnaSetScrapFolderRepository.java

@@ -41,4 +41,8 @@ Page<QnaSetScrapFolderResponse> findAllScrapFoldersWithQnaSetContainingInfo(
             User user, QnaSet qnaSet, Pageable pageable);
 
     void deleteAllByScrapFolder(ScrapFolder scrapFolder);
+
+    boolean existsByQnaSetAndScrapFolder(QnaSet qnaSet, ScrapFolder scrapFolder);
+
+    void deleteByQnaSetAndScrapFolder(QnaSet qnaSet, ScrapFolder scrapFolder);
 }

backend/src/main/java/com/shyashyashya/refit/domain/scrapfolder/service/ScrapFolderService.java

@@ -1,9 +1,14 @@
 package com.shyashyashya.refit.domain.scrapfolder.service;
 
+import static com.shyashyashya.refit.global.exception.ErrorCode.QNA_SET_NOT_FOUND;
 import static com.shyashyashya.refit.global.exception.ErrorCode.SCRAP_FOLDER_NOT_FOUND;
 
+import com.shyashyashya.refit.domain.interview.service.validator.InterviewValidator;
+import com.shyashyashya.refit.domain.qnaset.model.QnaSet;
+import com.shyashyashya.refit.domain.qnaset.repository.QnaSetRepository;
 import com.shyashyashya.refit.domain.scrapfolder.dto.response.ScrapFolderQnaSetResponse;
 import com.shyashyashya.refit.domain.scrapfolder.dto.response.ScrapFolderResponse;
+import com.shyashyashya.refit.domain.scrapfolder.model.QnaSetScrapFolder;
 import com.shyashyashya.refit.domain.scrapfolder.model.ScrapFolder;
 import com.shyashyashya.refit.domain.scrapfolder.repository.QnaSetScrapFolderRepository;
 import com.shyashyashya.refit.domain.scrapfolder.repository.ScrapFolderRepository;
@@ -24,8 +29,10 @@ public class ScrapFolderService {
 
     private final ScrapFolderRepository scrapFolderRepository;
     private final QnaSetScrapFolderRepository qnaSetScrapFolderRepository;
+    private final QnaSetRepository qnaSetRepository;
     private final RequestUserContext requestUserContext;
     private final ScrapFolderValidator scrapFolderValidator;
+    private final InterviewValidator interviewValidator;
 
     @Transactional(readOnly = true)
     public Page<ScrapFolderResponse> getMyScrapFolders(Pageable pageable) {
@@ -83,4 +90,38 @@ public void updateScrapFolderName(Long scrapFolderId, String scrapFolderName) {
         scrapFolderValidator.validateScrapFolderOwner(scrapFolder, user);
         scrapFolder.updateName(scrapFolderName);
     }
+
+    @Transactional
+    public void addQnaSetToScrapFolder(Long qnaSetId, Long scrapFolderId) {
+        ScrapFolder scrapFolder = scrapFolderRepository
+                .findById(scrapFolderId)
+                .orElseThrow(() -> new CustomException(SCRAP_FOLDER_NOT_FOUND));
+        QnaSet qnaSet = getValidatedQnaSet(qnaSetId);
+        scrapFolderValidator.validateScrapFolderOwner(
+                scrapFolder, qnaSet.getInterview().getUser());
+
+        if (!qnaSetScrapFolderRepository.existsByQnaSetAndScrapFolder(qnaSet, scrapFolder)) {
+            qnaSetScrapFolderRepository.save(QnaSetScrapFolder.create(qnaSet, scrapFolder));
+        }
+    }
+
+    @Transactional
+    public void removeQnaSetFromScrapFolder(Long qnaSetId, Long scrapFolderId) {
+        ScrapFolder scrapFolder = scrapFolderRepository
+                .findById(scrapFolderId)
+                .orElseThrow(() -> new CustomException(SCRAP_FOLDER_NOT_FOUND));
+        QnaSet qnaSet = getValidatedQnaSet(qnaSetId);
+        scrapFolderValidator.validateScrapFolderOwner(
+                scrapFolder, qnaSet.getInterview().getUser());
+
+        qnaSetScrapFolderRepository.deleteByQnaSetAndScrapFolder(qnaSet, scrapFolder);
+    }
+
+    // TODO: ID->Entity 변환기 별도로 분리 고려
+    private QnaSet getValidatedQnaSet(Long qnaSetId) {
+        QnaSet qnaSet = qnaSetRepository.findById(qnaSetId).orElseThrow(() -> new CustomException(QNA_SET_NOT_FOUND));
+        User requestUser = requestUserContext.getRequestUser();
+        interviewValidator.validateInterviewOwner(qnaSet.getInterview(), requestUser);
+        return qnaSet;
+    }
 }