如何使用模型映射器从实体转换为 dto，并从字符串转换为 UUID [英] How to convert from entity to dto using model mapper , with conversion from string to UUID

问题描述

我需要一些帮助才能使用模型映射器将实体映射到 DTO.这是我的两个 pojo

I need some help to map Entity to DTO using Model Mapper. Here are my two pojos

@Data
public class ClientDTO {
    private UUID id;
    @NotNull
    private String name;
    private String description;
    private String contactEmail;
}

@Data
@Entity
public class Client {
    @Id
    private String id;
    @NotNull
    private String name;
    private String description;
    @NotNull
    private String contactEmail;
}

当我尝试在 Client 到 ClientDTO 之间转换时，id 呈现为 null.我尝试编写一个 PropertyMap 和一个转换器，但它们都不适合我.

When am trying to convert between Client to ClientDTO id is rendered as null. I tried writing a PropertyMap and a converter but none of them is working for me.

推荐答案

我浏览了文档并找到了问题的解决方案.这是解决方案.

I went through the documentation and was able to find a solution to the problem. Here is the soln.

初始化

private PropertyMap<Client, ClientDTO> clientMap;
private ModelMapper clientToClientDtoMapper;

定义PropertyMap 和转换器

        clientToClientDtoMapper = new ModelMapper();
        Converter<Client, UUID> uuidConverter = new AbstractConverter<Client, UUID>() {
            protected UUID convert(Client source) {
                return UUID.fromString(source.getId());
            }
        };

        clientMap = new PropertyMap<Client, ClientDTO>() {
            protected void configure() {
                try {
                    using(uuidConverter).map(source).setId(null);
                } catch (Exception ex) {
                    System.out.println("Error.");
                }
            }
        };

        clientToClientDtoMapper.addMappings(clientMap);

从实体到 DTO 的辅助方法

    private ClientDTO convertToDto(Client client) {

        ClientDTO clientDTO = clientToClientDtoMapper.map(client, ClientDTO.class);
        return clientDTO;
    }

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