[WTH-65] @Query 기반 JPQL을 QueryDSL로 리팩토링

build.gradle

@@ -41,6 +41,12 @@ dependencies {
 	implementation 'io.jsonwebtoken:jjwt-jackson:0.11.5'
 	implementation 'com.auth0:java-jwt:4.2.1'
 
+	// QueryDSL
+	implementation 'com.querydsl:querydsl-jpa:5.0.0:jakarta'
+	annotationProcessor 'com.querydsl:querydsl-apt:5.0.0:jakarta'
+	annotationProcessor 'jakarta.persistence:jakarta.persistence-api:3.1.0'
+	annotationProcessor 'jakarta.annotation:jakarta.annotation-api:2.1.1'
+
 	// mapStruct
 	implementation 'org.mapstruct:mapstruct:1.5.3.Final'
 	annotationProcessor 'org.mapstruct:mapstruct-processor:1.5.3.Final'

src/main/java/leets/weeth/domain/board/domain/repository/PostRepository.java

@@ -12,7 +12,7 @@
 import org.springframework.data.repository.query.Param;
 
 
-public interface PostRepository extends JpaRepository<Post, Long> {
+public interface PostRepository extends JpaRepository<Post, Long>, PostRepositoryCustom {
 
 	@Query("""
         SELECT p FROM Post p

src/main/java/leets/weeth/domain/board/domain/repository/PostRepositoryCustom.java

@@ -0,0 +1,14 @@
+package leets.weeth.domain.board.domain.repository;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+
+import leets.weeth.domain.board.domain.entity.Post;
+
+public interface PostRepositoryCustom {
+
+	Slice<Post> findRecentPart(Pageable pageable);
+
+	Slice<Post> searchPart(String kw,Pageable pageable);
+
+}

src/main/java/leets/weeth/domain/board/domain/repository/PostRepositoryImpl.java

@@ -0,0 +1,64 @@
+package leets.weeth.domain.board.domain.repository;
+
+import java.util.List;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
+import org.springframework.data.domain.SliceImpl;
+import org.springframework.stereotype.Repository;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+
+import leets.weeth.domain.board.domain.entity.Post;
+import leets.weeth.domain.board.domain.entity.QPost;
+import leets.weeth.domain.board.domain.entity.enums.Category;
+import lombok.RequiredArgsConstructor;
+
+@Repository
+@RequiredArgsConstructor
+public class PostRepositoryImpl implements PostRepositoryCustom {
+
+	private final JPAQueryFactory queryFactory;
+	private final QPost post = QPost.post;
+
+	@Override
+	public Slice<Post> findRecentPart(Pageable pageable) {
+		List<Post> result = queryFactory
+			.selectFrom(post)
+			.where(post.category.in(Category.StudyLog, Category.Article))
+			.orderBy(post.id.desc())
+			.offset(pageable.getOffset())
+			.limit(pageable.getPageSize() + 1)
+			.fetch();
+
+		boolean hasNext = result.size() > pageable.getPageSize();
+
+		if (hasNext) {
+			result.remove(pageable.getPageSize());
+		}
+
+		return new SliceImpl<>(result, pageable, hasNext);
+	}
+
+	@Override
+	public Slice<Post> searchPart(String kw, Pageable pageable) {
+		List<Post> result = queryFactory
+			.selectFrom(post)
+			.where(post.category.in(Category.StudyLog, Category.Article)
+				.and(post.title.containsIgnoreCase(kw)
+					.or(post.content.containsIgnoreCase(kw))
+			))
+			.orderBy(post.id.desc())
+			.offset(pageable.getOffset())
+			.limit(pageable.getPageSize() + 1)
+			.fetch();
+
+		boolean hasNext = result.size() > pageable.getPageSize();
+
+		if (hasNext) {
+			result.remove(pageable.getPageSize());
+		}
+
+		return new SliceImpl<>(result, pageable, hasNext);
+ 	}
+}

src/main/java/leets/weeth/global/config/QuerydslConfig.java

@@ -0,0 +1,17 @@
+package leets.weeth.global.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.querydsl.jpa.impl.JPAQueryFactory;
+
+import jakarta.persistence.EntityManager;
+
+@Configuration
+public class QuerydslConfig {
+
+	@Bean
+	public JPAQueryFactory jpaQueryFactory(EntityManager em) {
+		return new JPAQueryFactory(em);
+	}
+}

src/test/java/leets/weeth/domain/board/domain/repository/PostRepositoryTest.java

@@ -0,0 +1,86 @@
+package leets.weeth.domain.board.domain.repository;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.*;
+
+import java.util.List;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Import;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+
+import leets.weeth.config.TestContainersConfig;
+import leets.weeth.domain.board.domain.entity.Post;
+import leets.weeth.domain.board.domain.entity.enums.Category;
+import leets.weeth.domain.board.domain.entity.enums.Part;
+import leets.weeth.global.config.QuerydslConfig;
+
+@DataJpaTest
+@Import({TestContainersConfig.class , QuerydslConfig.class})
+@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
+public class PostRepositoryTest {
+
+	@Autowired
+	private PostRepository postRepository;
+
+	@BeforeEach
+	void setUp() {
+		Post post1 = Post.builder()
+			.title("dsl 테스트 제목")
+			.content("QueryDSL동작확인")
+			.category(Category.StudyLog)
+			.cardinalNumber(1)
+			.week(1)
+			.parts(List.of(Part.BE))
+			.build();
+
+		Post post2 = Post.builder()
+			.title("테스트 제목2")
+			.content("2동작2확인2")
+			.category(Category.Article)
+			.cardinalNumber(2)
+			.week(1)
+			.parts(List.of(Part.BE))
+			.build();
+
+		postRepository.saveAll(List.of(post1,post2));
+
+	}
+
+
+	@Test
+	@DisplayName("findRecentPart(): StudyLog 또는 Article 카테고리 게시글 최신순 조회")
+	void findRecentPart_success() {
+		//given
+		Pageable pageable = PageRequest.of(0, 10);
+
+		//when
+		var result = postRepository.findRecentPart(pageable);
+
+		//then
+		assertThat(result).isNotNull();
+		assertThat(result.getContent()).hasSize(2);
+		assertThat(result.getContent().get(0).getTitle()).isEqualTo("테스트 제목2");
+	}
+
+	@Test
+	@DisplayName("searchPart(): 키워드 기반 검색")
+	void searchPart_success() {
+		//given
+		Pageable pageable = PageRequest.of(0, 10);
+
+		//when
+		var result = postRepository.searchPart("dsl", pageable);
+
+		//then
+		assertThat(result.getContent()).hasSize(1);
+		assertThat(result.getContent().get(0).getTitle()).isEqualTo("dsl 테스트 제목");
+	}
+}
+