使用模型映射器更新实体

发布于 2025-01-20 07:34:30 字数 668 浏览 0 评论 0原文

我在模型映射器上有一个奇怪的问题。可能我错过了它是如何工作的。我拥有的：一个示例模型类：

class Model{
 String name;
 String surname;
 Integer age;
 ...and much much more

一个方法

private void foo(){
        ModelMapper modelMapper = new ModelMapper();
        Model model = Model.builder().name("foo").surname("bar").age(23).build();
        Model newModel = Model.builder().name("john").build();
        modelMapper.map(newModel, model);
        System.out.println(model.toString());
}

和输出是：模型（name = john，surname = null，age = null） 但是我期望的模型（名称= John，姓氏= bar，age = 23） 我可以使用模型映射器执行此操作吗？如果没有，如何轻松执行此操作（我不想手动更新每个属性）？谢谢。

原文

I have a strange problem with model mapper. Probably I missunderstand how it works.
What I have: an example Model class:

class Model{
 String name;
 String surname;
 Integer age;
 ...and much much more

And a method

private void foo(){
        ModelMapper modelMapper = new ModelMapper();
        Model model = Model.builder().name("foo").surname("bar").age(23).build();
        Model newModel = Model.builder().name("john").build();
        modelMapper.map(newModel, model);
        System.out.println(model.toString());
}

And the output is: Model(name=john, surname=null, age=null)
But what I expect Model(name=john, surname=bar, age=23)
Can I do this using model mapper? If not, how to do this easily (i dont want update manually each property)? Thanks.

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末が日狂欢 2025-01-27 07:34:30

您可以使用Lombok Builder @Builder.default轻松执行此操作

public class Model {
    @Builder.Default
    String name = "foo";
    @Builder.Default
    String surname = "bar";
    @Builder.Default
    Integer age = 23;

You can do it easily using Lombok builder @Builder.Default You just need to update your Model class

public class Model {
    @Builder.Default
    String name = "foo";
    @Builder.Default
    String surname = "bar";
    @Builder.Default
    Integer age = 23;

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一笑百媚生 2025-01-27 07:34:30

是的，您误解了它的工作原理：在您的情况下它运行良好。它也正在映射空值。如果您不想要它，则可以在专用于ModelMapper的Spring配置类中使用该代码：

@Bean
public ModelMapper modelMapper() {
    ModelMapper modelMapper = new ModelMapper();
    modelMapper.getConfiguration()
            .setFieldAccessLevel(Configuration.AccessLevel.PRIVATE)
            .setMatchingStrategy(MatchingStrategies.STANDARD)
            .setSkipNullEnabled(true);
    return modelMapper;
}

重要的部分是setSkipnullabled（true）在此处全球处理该代码。当您处理表格时，请考虑一下。

Yes you misunderstood how it works : it works well in your case. It is mapping null values too. If you do not want that, you can use that code inside a Spring Configuration class dedicated to ModelMapper :

@Bean
public ModelMapper modelMapper() {
    ModelMapper modelMapper = new ModelMapper();
    modelMapper.getConfiguration()
            .setFieldAccessLevel(Configuration.AccessLevel.PRIVATE)
            .setMatchingStrategy(MatchingStrategies.STANDARD)
            .setSkipNullEnabled(true);
    return modelMapper;
}

The important part is setSkipNullEnabled(true) which handle that globally here. Take care of that when you are handling forms.

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