如何配置ModelMapper在内部值为null时不设置someClass=null（someClass是嵌套的）

Question

{
    "order": {
        "orderNumber": "123",
        "orderSize": "10cm",
        "orderDescription": "Some order",
        "orderClient": {
            "firstName": null,
            "lastName": null
        }
    }
}

但我得到了这个：

{
    "order": {
        "orderNumber": "123",
        "orderSize": "10cm",
        "orderDescription": "Some order",
        "orderClient": null
    }
}

我的榜样。

我在一个模型中有两个类：

class Order {

  private String number;
  private String size;
  private String description;
  private Client client;

  //getters and setters
}

class Client{

  private String firstName;
  private String lastName;

  //getters and setters
}

class OrderDTO {

    private String orderNumber;
    private String orderSize;
    private String orderDescription;
    private Client orderClient;

    //getters and setter
}

class ClientDTO {

  private String firstName;
  private String lastName;
  //getters and setters
}

Order order = someDao.getOrderByNumber(1234);
OrderDto orderDto = modelMapper.map(order, OrderDto.class);

***数据库中的firstName和lastName为空。

当firstName和lastName为null时，ModelMapper将my ClientDto设置为null。

映射后OrderDto的输出：“OrderDto(ordernumber=123，ordersize=10cm，orderdescription=some order，orderclient=null)”

提前感谢！

Answer 1

您可以尝试使用默认值，方法是在默认构造函数中初始化或声明属性

示例：

class OrderDTO {

    private String orderNumber;
    private String orderSize;
    private String orderDescription;
    private Client orderClient = new Client();

    //getters and setter
}

或

 class OrderDTO {

    private String orderNumber;
    private String orderSize;
    private String orderDescription;
    private Client orderClient;

    public OrderDTO() {
         this.orderClient = new Client();
    }
    //getters and setter
}