spring-data-jpa - 使用 spring 数据搜索嵌套对象，非法尝试取消引用路径源

Question

我使用spring data jpa，我有这些classe(每个都有id...不显示)

public class HOV{

    @ManyToOne(optional = false, fetch = FetchType.LAZY, cascade = {CascadeType.MERGE, CascadeType.PERSIST})
    @JoinColumn(name = "vehicle_type_id")
    private VehicleTypes vehicleType;
    ...
}

public class VehicleTypes{

    @OneToMany(mappedBy = "vehicleType")
    private List<Vehicles> vehicles = new ArrayList<>();

}

所以在 hov 存储库中，我尝试通过 carsId 进行搜索

List<HOV> findByVehicleTypeVehiclesId(Integer id);

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hOVRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.lcm.repository.HOVRepository.findByVehicleTypeVehiclesId(java.lang.Integer)! Illegal attempt to dereference path source [null.vehicleType.vehicles] of basic type

Answer 1

根据您的情况，我认为最好自己提供查询，例如:

@Query("select h from HOV h join h.vehicleType vt left join vt.vehicles v where v.id = ?1")
List<HOV> findWithQuery(Integer vehicleId);