Question

需要一些REST api的帮助，以便使用spring数据休息来实现Employee和Role之间的多对多关系

@Entity
@Table(name="employees")
public class Employee  {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator="employees_id_seq")
    @SequenceGenerator(name="employees_id_seq", sequenceName="employees_id_seq", allocationSize=1)
    @Column(name="EMPLOYEE_ID")
    private Long id;

    @NotNull
    private String email;

    @ManyToMany(cascade={}, fetch=FetchType.EAGER, targetEntity=Role.class) 
    @JoinTable(
        name="employee_roles",
        joinColumns=@JoinColumn(name="EMPLOYEE_ID", referencedColumnName="EMPLOYEE_ID"),
        inverseJoinColumns = @JoinColumn(name="ROLE_ID", referencedColumnName="ROLE_ID")
    )
    private List<Role> roles;

    public Employee() {
        System.out.println("Employee created");
    }

    public Employee(long id, String firstName, String lastName, String email) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

// Getters , Setter, etc.
}

@Entity
@Table(name="roles")
public class Role {

    @Id
    @Column(name="ROLE_ID")
    private String roleId;
    private String roleName;

    public Role() {

    }
// Getters, Setters, etc
}

Spring Data Repository：

import org.springframework.data.repository.CrudRepository;
public interface EmployeeRepository extends CrudRepository<Employee, Long>{}

从其余api收到的json中表示的当前数据库状态：

{
"firstName": "First1",
"lastName": "Last1",
"email": "first_last@acme.com",
"roles": [ {"roleName": "User"}, {"roleName": "Admin"}],
"locationId": 43,
"_links": {
"self": {
"href": "http://localhost:8091/employees/1"
},
"employee": {
"href": "http://localhost:8091/employees/1"
}
}
}

我在数据库中有以下角色数据：

从角色中选择role_id，role_name

role_id   role_name
-------   -------
adm       Admin
usr       User

我想删除用户角色并为用户保留管理员角色。我正在尝试使用以下有效负载的PATCH请求

{
"roles": [ {"roleId": "adm"}]
}

不幸的是，它会导致错误：

org.hibernate.HibernateException：Role实例的标识符已从usr更改为adm

如果我尝试使用有效负载删除角色Admin

{ 
  "roles": [ {"roleId": "usr"}] 
}

它运作得很好。

似乎行为取决于角色Id的顺序。

感谢任何帮助或建议。

Answer 1

改变SDR中角色集合的正确机制是发送PATCH请求，如下所示：

{ 
  "roles": [ 
      "http://localhost:8091/roles/adm",
      "http://localhost:8091/roles/usr"
  ] 
}

然而，请参阅Hopper SR5中的以下回归，并在Hooper SR9中修复。

https://jira.spring.io/browse/DATAREST-1041

修改ManyToMany关联的修补程序请求

1 个答案: