인프런 커뮤니티 질문&답변

OrderItemQueryDto와 OrderQueryDto를 생성한 후, OrderQueryRepository를 생성하여 학습하고 있는데 강의 내용과는 다르게 진행중입니다. (밑에 질문 글에 한번 올렸었습니다.)

스프링데이터JPA로 진행하다보니 @Query를 작성하여 연습하는 중

java.lang.IllegalStateException: Cannot instantiate class 'jaein.crudpractice.repository.order.query.OrderItemQueryDto' (it has no constructor with signature [java.lang.Long, java.lang.String, java.time.LocalDateTime, java.time.LocalDateTime], and not every argument has an alias)

자꾸 생성자쪽에서 문제가 발생합니다.

OrderItemQueryDto

package jaein.crudpractice.repository.order.query;

import com.fasterxml.jackson.annotation.JsonIgnore;
import jaein.crudpractice.domain.OrderItem;
import lombok.Data;

@Data
public class OrderItemQueryDto {

    @JsonIgnore
    private Long orderId;
    private String itemName;
    private int count;

    public OrderItemQueryDto(Long orderId, String itemName, int count) {
        this.orderId = orderId;
        this.itemName = itemName;
        this.count = count;
    }

}

OrderQueryDto

package jaein.crudpractice.repository.order.query;

import jaein.crudpractice.domain.Order;
import jaein.crudpractice.domain.OrderItem;
import jaein.crudpractice.domain.OrderStatus;
import lombok.Data;
import lombok.EqualsAndHashCode;

import java.time.LocalDateTime;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Data
@EqualsAndHashCode(of = "orderId")
public class OrderQueryDto {

    private Long orderId;
    private String name;
    private LocalDateTime loanDate;
    private LocalDateTime returnDate;
    private List<OrderItemQueryDto> orderItems;

    public OrderQueryDto(Long orderId, String name, LocalDateTime loanDate, LocalDateTime returnDate, List<OrderItemQueryDto> orderItems) {
        this.orderId = orderId;
        this.name = name;
        this.loanDate = loanDate;
        this.returnDate = returnDate;
        this.orderItems = orderItems;
    }
}

OrderQueryRepository

package jaein.crudpractice.repository.order.query;

import jaein.crudpractice.domain.Order;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public interface OrderQueryRepository extends JpaRepository<Order, Long> {


    @Query("select distinct new jaein.crudpractice.repository.order.query.OrderQueryDto(" +
            "o.id, s.name, o.loanDate, o.returnDate, oi) " +
            "from Order o " +
            "join o.student s " +
            "join o.orderItems oi")
    List<OrderQueryDto> findOrderQueryDtos(Pageable pageable);

    @Query("select distinct new jaein.crudpractice.repository.order.query.OrderItemQueryDto(" +
            "oi.order.id, i.name, oi.count)" +
            " from OrderItem oi " +
            " join oi.item i " +
            " where oi.order.id = :orderId")
    List<OrderItemQueryDto> findOrderItems(@Param("orderId") Long orderId);

}

생성자도 다 맞게 작성했는데 어느부분이 잘못됐는지 모르겠습니다.

강의대로 EntityManager를 사용하여 해보아도 같은 에러가 발생합니다.

도메인에서 연관관계 매핑에서 문제가 있는걸까요??