Spring Data JPA-如何通过父对象的ID查找嵌套对象？

Question

Some object:

public class SomeObject {
    @Id
    @GeneratedValue
    private Long id;

    @OneToMany(mappedBy = "someObject")
    @Cascade(CascadeType.ALL)
    private Collection<NestedObject> nestedObjects;

    // ...
}

Nested object:

public class NestedObject {
    @Id
    @GeneratedValue
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    private SomeObject someObject;

    // ...
}

I can find all nested objects by findAll method, but I can't find nested objects by someObject 's id or itself (I'm getting empty collection).

public interface NestedObject Repository extends JpaRepository<NestedObject , Long> {

    Collection<NestedObject> findBySomeObject_Id(Long id);

    Collection<NestedObject> findBySomeObject(SomeObject someObject);
}

Answer 1

Forget initialize SomeObject in NestedObject s in SomeObject 's constructor:

    for (NestedObject nestedObject: nestedObjects)
        nestedObject.setSomeObject(this);