java – Spring Controller – 将JSON属性映射到外键实体

UserController.
java

@RestController
@RequestMapping("/users")
public class UserController {
    // code
    @PostMapping("/sign-up")
    public void signUp(@RequestBody User user) {
        //code
    }
}

用户

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "user_id")
    private long id;

    @ManyToOne
    @JoinColumn(name = "language_id")
    private Language language;

    // others
    public User() {
    }
}

所以,正如您所见,语言是一个独立的实体.但我希望能够发送以下JSON结构

{
    "foreName" : "bla",
    "sureName" : "blo",
    "language" : "1"
}

但是我收到以下错误

Cannot construct instance of entity.db.user.Language (although at
least one Creator exists): no String-argument constructor/factory
method to deserialize from String value (‘1’);

我是否需要通过过滤器预先获取语言实体?是否有强制解析方法的表单?在这里正确地做到这一点的方法是什么?

最佳答案 在API方法中创建一个新的DTO对象Say UserDTO作为Request Body.处理DTO以形成用户实体,以进一步继续.

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