如何使用mapstruct将对象映射为字段？

Question

我需要将多个dto映射到实体。几乎所有的dto都有一个指向另一个dto的引用，我不知道在映射dto时如何传递引用。

以下是该地址的一个业务实现：

addressRepository.saveAll(dtos.stream()
                .map(addressMapper::asEntity)
                .collect(Collectors.toList())).stream()
                .map(addressMapper::asDto)
                .collect(Collectors.toList());

这是地图绘制者

    @Mappings({
            @Mapping(target="streetName", source="streetName"),
            @Mapping(target="streetNumber", source="streetNumber"),
            @Mapping(target="block", source="block"),
            @Mapping(target="floor", source="floor")

    })
    CsvBusinessData asDto(AddressEntity address);

    @InheritInverseConfiguration
    AddressEntity asAddressEntity(CsvBusinessData address);

所有实现者都从同一个dto读取，然后将它们映射到dto和entites。

以下是针对客户实施的建议：

customerRepository.saveAll(dtos.stream()
            .map( csvMapper::asCustomerEntity)

            .collect(Collectors.toList())).stream()
            .map(customerMapper::asDto)
            .collect(Collectors.toList()); 

以及我希望引用映射地址实体的映射（我的客户实体有一个地址类型字段）。

 @Mappings({
            @Mapping(target = "nom", source = "lastName"),
            @Mapping(target = "nd", source = "accountNumber"),
            @Mapping(target = "logo", source = "logo"),
            @Mapping(target = "address", source = "address"
            )

    })
    CsvBusinessData asDto(CustomerEntity customer);

    @InheritInverseConfiguration
    CustomerEntity asCustomerEntity(CsvBusinessData customer);

非常感谢你。

Answer 1

首先，您不必为同名字段创建映射，MapStruct会为您创建映射。例如block block。1） 您的对象是相关的：您可以对相关对象使用“使用”功能。

@Mapper(uses = {AddressMapper.class}, unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface CustomerMapper {
    @Mapping(target = "nom", source = "lastName")
    @Mapping(target = "nd", source = "accountNumber")
    @Mapping(target = "logo", source = "logo") // not needed as same name, delete it
    @Mapping(target = "address", source = "address") // not needed as same name, delete it
    CsvBusinessData asDto(CustomerEntity customer);

    @InheritInverseConfiguration
    CustomerEntity asCustomerEntity(CsvBusinessData customer);
}

@Mapper( unmappedTargetPolicy = ReportingPolicy.IGNORE)
public interface CustomerMapper {
    @Mapping(target="streetName", source="streetName") // not needed as same name, delete it
    @Mapping(target="streetNumber", source="streetNumber") // not needed as same name, delete it
    @Mapping(target="block", source="block") // not needed as same name, delete it
    @Mapping(target="floor", source="floor") // not needed as same name, delete it
    CsvBusinessData asDto(AddressEntity address);
}

2）您的对象不相关：您可以通过传递少量对象作为参数来解决您的问题。但是对于相反的方向，您必须有自己的方法。如果您在AddressEntity和CustomerEntity中有相同的字段名称，那么只需将其指定address.street名称或customer.last名称

@Mapping(target="streetName", source="streetName")// possibly not needed as same name
@Mapping(target="streetNumber", source="streetNumber")// possibly not needed as same name
@Mapping(target="block", source="block")// possibly not needed as same name
@Mapping(target="floor", source="floor")// possibly not needed as same name
@Mapping(target = "nom", source = "lastName")
@Mapping(target = "nd", source = "accountNumber")
@Mapping(target = "logo", source = "logo")// possibly not needed as same name
@Mapping(target = "address", source = "customer.address") // specified as you have parameter address
CsvBusinessData asDto(AddressEntity address, CustomerEntity customer);

@Mapping(target="streetName", source="streetName")// possibly not needed as same name
@Mapping(target="streetNumber", source="streetNumber")// possibly not needed as same name
@Mapping(target="block", source="block")// possibly not needed as same name
@Mapping(target="floor", source="floor")// possibly not needed as same name
AddressEntity asAddressEntity(CsvBusinessData businessData);

@Mapping(source = "nom", target = "lastName")
@Mapping(source = "nd", target = "accountNumber")
@Mapping(source = "logo", target = "logo")// possibly not needed as same name
@Mapping(source = "address", target = "address") // specified as you have parameter address
CustomerEntity asCustomerEntity(CsvBusinessData businessData);