Mapstruct 'aftermapping' 未调用

Question

问题是，根本不会调用用 @AfterMapping 注释的方法。它从 testToEntityMapping 转到 toEntity 方法，但不调用任何 toEntityAfterMapping() 方法。为什么？可能吗？我怎样才能使用 MapStruct 实现它？

（这里我准备了一个没有意义的场景，但它完全抓住了我问题的本质）
实体：

public class Ford {
    private String color;
    private String market;
    private int totalWidth;

    //getters and setters omitted for brevity
}

Dtos:

public abstract class FordDto {
    public String market;
    public String color;

    //getters and setters omitted for brevity
}

public class EuropeanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 2;//"+2" for EU market
    }
    //setter omitted for brevity
}

public class AmericanFordDto extends FordDto{
    private int totalWidth;

    public int getTotalWidth() {
        return totalWidth + 1;//"+1" for US market
    }

    //setter omitted for brevity
}

映射器：

public abstract class FordMapper<D extends FordDto> {
    public Ford toEntity(D dto) {

        /* fill in fields common to both ford versions */

        final Ford ford = new Ford();

        ford.setColor(dto.getColor());
        ford.setMarket(dto.getMarket());

        return ford;
    }
}
@Mapper(componentModel = "spring")
public abstract class EuropeanFordMapper extends FordMapper<EuropeanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final EuropeanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to european version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}
@Mapper(componentModel = "spring")
public abstract class AmericanFordMapper extends FordMapper<AmericanFordDto> {

    @AfterMapping
    public void toEntityAfterMapping(final AmericanFordDto dto, @MappingTarget final Ford entity) {

        /* Fill in fields related to american version of the ford */

        entity.setTotalWidth(dto.getTotalWidth());
    }
}

服务：

@Service
public class CarService {

    @Autowired
    private AmericanFordMapper americanFordMapper;
    @Autowired
    private EuropeanFordMapper europeanFordMapper;

    public void testToEntityMapping(final FordDto dto) {

        if (dto instanceof AmericanFordDto) {
            americanFordMapper.toEntity((AmericanFordDto) dto);
        } else {
            europeanFordMapper.toEntity((EuropeanFordDto) dto);
        }
    }
}

Answer 1

好的，比我想象的要简单。

public interface FordMapper<D extends FordDto> {
    
    @Mapping(target = "totalWidth", ignore=true)
    public abstract Ford toEntity(D dto);
}

你甚至可以查看 toEntity() 方法中的实现，有一个对 toEntityAfterMapping() 的调用，因此一切都是正确的并且符合我们想要的结果。

Answer 2

我对相同问题的解决方案是我忘记将 'default' 关键字添加到我的 @AfterMapping 方法（我使用接口）。在该方法出现在生成的代码中之后。

并且不要忘记运行 mvn/gradle 进行更改后进行清理和编译。

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