퀴즈 진행 컨트롤러 전달 인자 수정 #42

src/main/java/com/ripple/BE/learning/controller/QuizController.java

@@ -4,7 +4,6 @@
 import com.ripple.BE.learning.dto.QuizDTO;
 import com.ripple.BE.learning.dto.QuizListDTO;
 import com.ripple.BE.learning.dto.QuizResultDTO;
-import com.ripple.BE.learning.dto.request.SubmitAnswerRequest;
 import com.ripple.BE.learning.dto.response.QuizListResponse;
 import com.ripple.BE.learning.dto.response.QuizResponse;
 import com.ripple.BE.learning.dto.response.QuizResultResponse;
@@ -13,15 +12,16 @@
 import com.ripple.BE.user.domain.type.Level;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
-import jakarta.validation.Valid;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.validation.annotation.Validated;
 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.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
@@ -47,15 +47,16 @@ public ResponseEntity<ApiResponse<Object>> startQuiz(
                 .body(ApiResponse.from(QuizListResponse.toQuizListResponse(quizListDTO)));
     }
 
-    @Operation(summary = "퀴즈 제출", description = "퀴즈를 제출 후 정답 여부와 해설을 반환합니다.")
+    @Validated
+    @Operation(summary = "퀴즈 제출", description = "퀴즈를 제출 후 정답 여부와 해설을 반환합니다. 정답 선지 번호는 0부터 3까지입니다.")
     @PostMapping("/{learningSetId}/quizzes/{quizId}")
     public ResponseEntity<ApiResponse<Object>> submitAnswer(
             final @AuthenticationPrincipal CustomUserDetails currentUser,
             final @PathVariable("quizId") long quizId,
-            final @RequestBody @Valid SubmitAnswerRequest request) {
+            @RequestParam @Min(0) @Max(3) Integer answerIndex) {
 
         QuizResultDTO quizResultDTO =
-                quizService.submitAnswer(currentUser.getId(), quizId, request.answerIndex());
+                quizService.submitAnswer(currentUser.getId(), quizId, answerIndex);
 
         return ResponseEntity.status(HttpStatus.OK)
                 .body(ApiResponse.from(QuizResultResponse.toQuizResultResponse(quizResultDTO)));

src/main/java/com/ripple/BE/learning/service/quiz/QuizService.java

@@ -23,7 +23,9 @@
 import com.ripple.BE.user.domain.type.Level;
 import com.ripple.BE.user.service.UserService;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -120,18 +122,19 @@ public QuizResultDTO submitAnswer(final long userId, final long quizId, final in
     public void finishQuiz(final long userId, final long learningSetId, final Level level) {
 
         User user = userService.findUserById(userId);
-        List<Integer> failList =
-                quizRedisService.fetchListFromRedis(userId, WRONG_ANSWER_TYPE, Integer.class);
+        Set<Integer> failSet =
+                new HashSet<>(
+                        quizRedisService.fetchListFromRedis(userId, WRONG_ANSWER_TYPE, Integer.class));
         UserLearningSet userLearningSet =
                 userLearningSetRepository
                         .findByUserIdAndLearningSetIdAndLevel(userId, learningSetId, level)
                         .orElseThrow(() -> new LearningException(LearningErrorCode.LEARNING_SET_NOT_FOUND));
         List<FailQuiz> failQuizList =
-                failList.stream().map(quizId -> FailQuiz.toFailQuiz(user, getQuizById(quizId))).toList();
+                failSet.stream().map(quizId -> FailQuiz.toFailQuiz(user, getQuizById(quizId))).toList();
         int quizCount = quizRedisService.fetchFromRedis(userId, QUIZ_COUNT, Integer.class);
 
         if (!userLearningSet.isQuizCompleted()) {
-            int correctCount = quizCount - failList.size(); // 정답 개수 계산
+            int correctCount = quizCount - failSet.size(); // 정답 개수 계산
             userLearningSet.setQuizCompleted(); // 퀴즈 완료 처리
             userService.updateUserStatsAfterQuiz(
                     user, level, failQuizList, quizCount, correctCount); // 사용자 통계 업데이트