Java 同一类型的多个字段的从字符串到嵌套对象的Mapstruct

我有一个带有字段的实体类：

客户发送方

客户收件人 我有DTO类和字段：

长senderId

长受体 如果我喜欢这个：

@Mappings({ @Mapping(source = "senderId", target = "sender.id"), @Mapping(source = "recipientId", target = "recipient.id") })

public Entity toEntity(DTO) {
        //...
        entity.setSender( dtoToClient( dto ) );
        entity.setRecipient( dtoToClient( dto ) );
        //...

    protected Client dtoToClient(Dto dto) {
        Client client = new Client();
        client.setId( dto.getRecipientId() ); // mapstruct takes recipient id for sender and recipient
        return client;
    }
}

Mapstruct将生成如下代码：

@Mappings({ @Mapping(source = "senderId", target = "sender.id"), @Mapping(source = "recipientId", target = "recipient.id") })

public Entity toEntity(DTO) {
        //...
        entity.setSender( dtoToClient( dto ) );
        entity.setRecipient( dtoToClient( dto ) );
        //...

    protected Client dtoToClient(Dto dto) {
        Client client = new Client();
        client.setId( dto.getRecipientId() ); // mapstruct takes recipient id for sender and recipient
        return client;
    }
}

Mapstruct使用发件人和收件人的收件人id而不是收件人id来创建客户端收件人，使用发件人id来创建客户端发件人

因此，我发现更好的方法是使用我认为不那么优雅的表达方式：

@Mappings({
      @Mapping(target = "sender", expression = "java(createClientById(dto.getSenderId()))"),
      @Mapping(target = "recipient", expression = "java(createClientById(dto.getRecipientId()))")
})

---

您能建议我如何映射它们吗？

在错误解决之前，您需要定义方法并使用

qualifiedby

或

qualifiedByName

。有关更多信息，请参阅文档

您的映射器应该如下所示：

@Mapper
public interface MyMapper {

    @Mappings({
        @Mapping(source = "dto", target = "sender", qualifiedByName = "sender"),
        @Mapping(source = "dto", target = "recipient", qualifiedByName = "recipient")
    })
    Entity toEntity(Dto dto);


    @Named("sender")
    @Mapping(source = "senderId", target = "id")
    Client toClient(Dto dto);

    @Named("recipient")
    @Mapping(source = "recipientId", target = "id")
    Client toClientRecipient(Dto dto);
}

---

在解决错误之前，您需要定义方法并使用

qualifiedby

或

qualifiedByName

。有关更多信息，请参阅文档

您的映射器应该如下所示：

@Mapper
public interface MyMapper {

    @Mappings({
        @Mapping(source = "dto", target = "sender", qualifiedByName = "sender"),
        @Mapping(source = "dto", target = "recipient", qualifiedByName = "recipient")
    })
    Entity toEntity(Dto dto);


    @Named("sender")
    @Mapping(source = "senderId", target = "id")
    Client toClient(Dto dto);

    @Named("recipient")
    @Mapping(source = "recipientId", target = "id")
    Client toClientRecipient(Dto dto);
}

---

这是一个错误。我已经为此创建了一个bug。我已经为此创造了