我有两个实体
@Entity
@Table(name = "groups")
public class Group {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@ManyToOne
private Company company;
...
}
@Entity
public class Company {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@OneToMany(mappedBy = "company", cascade = CascadeType.ALL)
private Set<Group> groups = new HashSet<>();
public void addGroup(final Group group) {
groups.add(group);
}
...
}
如果我单独保存每一个,那么一切都很好
Company company = companyRepository.save(new Company());
Group group = new Group();
group.setName("Managers");
group.setCompany(company);
groupRepository.save(group);
但是,如果我试图在Hibernate的肩膀上转移组的创建
Group group = new Group();
group.setName("Managers");
Company company = new Company();
company.addGroup(group);
companyRepository.save(company);
然后使用空company
字段
db=> select * from groups;
id | name | company_id
----+----------------+------------
1 | Admins |
2 | Managers |
3 | Operators |
我希望Hibernate能够建立关系。我做错了吗?