JpaRepository上的测试deleteByteId不起作用

Question

我在@DataJpaTest中调用deleteById时遇到问题。从类似的问题中尝试了许多解决方案，但都无济于事。这是实体：

实体：

@Setter
@Getter
@NoArgsConstructor
@Entity
@DynamicUpdate
@Table(name = "project")
public class Project{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column
private String name;
@Column
private String description;
@Column
@CreationTimestamp
private LocalDateTime created;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "parent_id")
private Project parent;

@OneToMany(mappedBy = "parent", cascade = CascadeType.REMOVE, orphanRemoval = true)
private Set<Project> subProjects = new HashSet<>();
}

JpaRepository

@Repository
public interface ProjectRepository extends JpaRepository<Project, Long>{
}

测试

@Test
void givenParentAndChilds_whenDeleteParent_thenDeleteChilds() {
// Given
Project parent = Project.builder().name("parent").build();
parent = projectRepository.save(parent);

Project child1 = Project.builder().name("child1").build();
child1.setParent(parent);
child1 = projectRepository.save(child1);

Project child2 = Project.builder().name("child2").build();
child2.setParent(parent);
child2 = projectRepository.save(child2);

Project child3 = Project.builder().name("child3").build();
child3.setParent(parent);
child3 = projectRepository.save(child3);

assertTrue(projectRepository.findById(parent.getId()).isPresent());
assertTrue(projectRepository.findById(child1.getId()).isPresent());
assertTrue(projectRepository.findById(child2.getId()).isPresent());
assertTrue(projectRepository.findById(child3.getId()).isPresent());

// When
projectRepository.deleteById(parent.getId());

// Then
assertFalse(projectRepository.findById(parent.getId()).isPresent());
assertFalse(projectRepository.findById(child1.getId()).isPresent()); // <-- these assertions fails
assertFalse(projectRepository.findById(child2.getId()).isPresent());
assertFalse(projectRepository.findById(child3.getId()).isPresent());
}

在测试期间，不会通过级联删除子项。我尝试了以下方法：

1. 将orphanRemoval = true添加到Project实体中的@OneToMany注释
2. 在ProjectRepository中添加deleteById和@Transactional
3. 添加@Transactional作为测试注释

以上都不起作用，不能删除子项。在Spring Boot日志中，也缺少DELETE查询。我的测试出了什么问题？

Answer 1

解决方案是正确设置parent和childs:之间的双向链接

public void setParent(Project parent){
this.parent = parent;
parent.getSubProjects().add(this);
}