Feat : 퀴즈 스크랩 쿼리 작성 (#25)

src/main/java/com/ripple/BE/learning/repository/quizScrap/QuizScrapRepository.java

@@ -5,4 +5,5 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface QuizScrapRepository extends JpaRepository<QuizScrap, Long> {}
+public interface QuizScrapRepository
+        extends JpaRepository<QuizScrap, Long>, QuizScrapRepositoryCustom {}

src/main/java/com/ripple/BE/learning/repository/quizScrap/QuizScrapRepositoryCustom.java

@@ -0,0 +1,9 @@
+package com.ripple.BE.learning.repository.quizScrap;
+
+import com.ripple.BE.learning.domain.quiz.Quiz;
+import java.util.List;
+
+public interface QuizScrapRepositoryCustom {
+
+    List<Quiz> findQuizScrappedByUser(Long userId);
+}

src/main/java/com/ripple/BE/learning/repository/quizScrap/QuizScrapRepositoryCustomImpl.java

@@ -0,0 +1,27 @@
+package com.ripple.BE.learning.repository.quizScrap;
+
+import static com.ripple.BE.learning.domain.quiz.QQuiz.*;
+import static com.ripple.BE.learning.domain.quiz.QQuizScrap.*;
+import static com.ripple.BE.post.domain.QPost.*;
+import static com.ripple.BE.post.domain.QPostScrap.*;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+import com.ripple.BE.learning.domain.quiz.Quiz;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class QuizScrapRepositoryCustomImpl implements QuizScrapRepositoryCustom {
+
+    private final JPAQueryFactory queryFactory;
+
+    @Override
+    public List<Quiz> findQuizScrappedByUser(Long userId) {
+        return queryFactory
+                .select(quiz)
+                .from(quizScrap)
+                .join(quizScrap.quiz, quiz)
+                .where(quizScrap.user.id.eq(userId))
+                .fetch();
+    }
+}