Question

我有表car和season_tickers，我想通过关系ManyToMany将它们联接起来，联接表应该有额外的字段。完成代码后，我决定通过@DataJpaTest进行测试（我使用SpringBoot和Spring Data JPA）。根据此测试，我发现代码无法正常工作，原因是OneToMany字段返回null（请参见失败的断言下测试代码中的注释）。你能帮我解决吗？

PS：我在生产代码上对其进行了测试，并且一切正常。因此，问题仅在@DataJpaTest

我的测试具有以下视图：

@ExtendWith({SpringExtension.class})
@DataJpaTest
public class CarDaoTest {

@Autowired
private TestEntityManager testEntityManager;

@Autowired
private CarDAO carDAO;

@Test
void findCarWithSeasonTicketTest(){
    SeasonTicket seasonTicket = SeasonTicket.builder()
            .name("TestName")
            .build();
    seasonTicket = testEntityManager.persist(seasonTicket);

    Car car = Car.builder()
            .carNumber("someCarNumber")
            .build();
    car = testEntityManager.persist(car);

    CarSeasonTicket carSeasonTicket = CarSeasonTicket.builder()
            .car(car)
            .seasonTicket(seasonTicket)
            .startDate(LocalDateTime.now())
            .endDate(LocalDateTime.now())
            .build();

    carSeasonTicket = testEntityManager.persist(carSeasonTicket);

    Optional<Car> findCar = carDAO.findById(car.getId());
    assertThat(findCar.isPresent()).isTrue();

    Car carFromDAO = findCar.get();

    // test fails in this line with message Expecting actual not to be null
    assertThat(carFromDAO.getSeasonTickets()).hasSize(1);
}

}

汽车实体：

@Entity
@Table(name = "cars")
public class Car {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@Column(name="car_number", nullable = false, length = 10)
private String carNumber;

@OneToMany(mappedBy = "car", fetch = FetchType.EAGER)
private List<CarSeasonTicket> seasonTickets;
}

已加入表格实体：

@Entity
@Table(name = "car_season_ticket")
@Data
public class CarSeasonTicket {

@EmbeddedId
@Builder.Default private CarSeasonTicketId carSeasonTicketId = new CarSeasonTicketId();

@ManyToOne(fetch = FetchType.LAZY)
@MapsId("carId")
private Car car;

@ManyToOne(fetch = FetchType.LAZY)
@MapsId("seasonTicketId")
private SeasonTicket seasonTicket;

@Column(name = "start_date")
private LocalDateTime startDate;

@Column(name = "end_date")
private LocalDateTime endDate;
}

可嵌入密钥：

@Embeddable
@Data
public class CarSeasonTicketId implements Serializable {

@Column(name = "car_id")
private Long carId;

@Column(name = "season_ticket_id")
private Long seasonTicketId;
}

SpringData JPA测试中具有EmbeddedId的OneToMany返回null

0 个答案: