Be/#307 QueryDSL을 사용한 API에서 createdAt으로 정렬안되는 오류 수정

backend/src/main/java/com/graphy/backend/domain/project/repository/custom/ProjectCustomRepositoryImpl.java

@@ -2,6 +2,8 @@
 
 import com.graphy.backend.domain.project.domain.Project;
 import com.graphy.backend.domain.project.repository.ProjectCustomRepository;
+import com.graphy.backend.global.util.QueryDslUtil;
+import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.JPQLQuery;
 import com.querydsl.jpa.impl.JPAQuery;
@@ -25,10 +27,12 @@ public class ProjectCustomRepositoryImpl implements ProjectCustomRepository {
 
     @Override
     public Page<Project> searchProjectsWith(Pageable pageable, String projectName, String content) {
+        List<OrderSpecifier> orders = QueryDslUtil.getAllOrderSpecifiers(pageable, project.getMetadata().getName());
         List<Project> fetch = jpaQueryFactory
                 .selectFrom(project).where(projectNameLike(projectName), contentLike(content))
                 .offset(pageable.getOffset())
                 .limit(pageable.getPageSize())
+                .orderBy(orders.stream().toArray(OrderSpecifier[]::new))
                 .fetch();
 
         JPQLQuery<Project> count = jpaQueryFactory
@@ -41,12 +45,14 @@ public Page<Project> searchProjectsWith(Pageable pageable, String projectName, S
 
     @Override
     public Page<Project> findFollowingProjects(Pageable pageable, Long fromId) {
+        List<OrderSpecifier> orders = QueryDslUtil.getAllOrderSpecifiers(pageable, project.getMetadata().getName());
         List<Project> fetch = jpaQueryFactory.selectFrom(project)
                 .where(project.member.id.in(
                         select(follow.toId).from(follow).where(follow.fromId.eq(fromId)
                 )))
                 .offset(pageable.getOffset())
                 .limit(pageable.getPageSize())
+                .orderBy(orders.stream().toArray(OrderSpecifier[]::new))
                 .fetch();
         JPAQuery<Long> count = jpaQueryFactory
                 .select(project.count())

backend/src/main/java/com/graphy/backend/domain/recruitment/repository/custom/RecruitmentCustomRepositoryImpl.java

@@ -3,7 +3,9 @@
 import com.graphy.backend.domain.recruitment.domain.Position;
 import com.graphy.backend.domain.recruitment.domain.Recruitment;
 import com.graphy.backend.domain.recruitment.repository.RecruitmentCustomRepository;
+import com.graphy.backend.global.util.QueryDslUtil;
 import com.querydsl.core.BooleanBuilder;
+import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
@@ -29,6 +31,8 @@ public List<Recruitment> findRecruitments(List<Position> positions,
                                               Boolean isRecruiting,
                                               Pageable pageable) {
 
+        List<OrderSpecifier> orders = QueryDslUtil.getAllOrderSpecifiers(pageable, recruitment.getMetadata().getName());
+
         return jpaQueryFactory
                 .selectFrom(recruitment)
                 .distinct()
@@ -42,7 +46,9 @@ public List<Recruitment> findRecruitments(List<Position> positions,
                 .leftJoin(recruitmentTag).on(recruitmentTag.recruitment.eq(recruitment))
                 .leftJoin(recruitmentTag.tag, tag)
                 .offset(pageable.getOffset())
+                .orderBy(orders.stream().toArray(OrderSpecifier[]::new))
                 .limit(pageable.getPageSize())
+
                 .fetch();
     }
 

backend/src/main/java/com/graphy/backend/global/util/QueryDslUtil.java

@@ -0,0 +1,53 @@
+package com.graphy.backend.global.util;
+
+import static org.springframework.util.ObjectUtils.isEmpty;
+
+import com.graphy.backend.domain.project.domain.QProject;
+import com.graphy.backend.domain.recruitment.domain.QRecruitment;
+import com.querydsl.core.types.Order;
+import com.querydsl.core.types.OrderSpecifier;
+import com.querydsl.core.types.Path;
+import com.querydsl.core.types.dsl.DateTimePath;
+import com.querydsl.core.types.dsl.Expressions;
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+
+public class QueryDslUtil {
+
+    public static OrderSpecifier<?> getSortedColumn(Order order, Path<?> parent, String fieldName) {
+        Path<Object> fieldPath = Expressions.path(Object.class, parent, fieldName);
+
+        return new OrderSpecifier(order, fieldPath);
+    }
+
+    public static List<OrderSpecifier> getAllOrderSpecifiers(Pageable pageable, String entityType) {
+
+        List<OrderSpecifier> orders = new ArrayList<>();
+
+        if (!isEmpty(pageable.getSort())) {
+            for (Sort.Order order : pageable.getSort()) {
+                if ("createdAt".equals(order.getProperty())) {
+                    Order direction = order.getDirection().isAscending() ? Order.ASC : Order.DESC;
+                    DateTimePath<LocalDateTime> path;
+                    switch (entityType) {
+                        case "recruitment":
+                            path = QRecruitment.recruitment.createdAt;
+                            break;
+                        case "project":
+                            path = QProject.project.createdAt;
+                            break;
+                        default:
+                            throw new IllegalArgumentException("Entity의 타입이 아닙니다.");
+                    }
+                    OrderSpecifier<?> orderSpecifier = QueryDslUtil.getSortedColumn(direction, path, "createdAt");
+                    orders.add(orderSpecifier);
+                }
+            }
+        }
+
+        return orders;
+    }
+}