[英]Spring Data JPA - How to find nested objects by parental object's id?
一些对象:
public class SomeObject {
@Id
@GeneratedValue
private Long id;
@OneToMany(mappedBy = "someObject")
@Cascade(CascadeType.ALL)
private Collection<NestedObject> nestedObjects;
// ...
}
嵌套对象:
public class NestedObject {
@Id
@GeneratedValue
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
private SomeObject someObject;
// ...
}
我可以通过findAll方法找到所有嵌套的对象,但是我无法通过someObject的ID或自身找到嵌套的对象(我正在获取空集合)。
public interface NestedObject Repository extends JpaRepository<NestedObject , Long> {
Collection<NestedObject> findBySomeObject_Id(Long id);
Collection<NestedObject> findBySomeObject(SomeObject someObject);
}
忘记SomeObject的构造函数NestedObject的initialize SomeObject:
for (NestedObject nestedObject: nestedObjects)
nestedObject.setSomeObject(this);
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