Map a dto to an entity retrieved from database if Dto has Id using MapStruct

Question

I\'m using MapStruct to make dto <-> entity mapping. The same mappers are used to create and update en

Answer 1

I solved my problem by following the advice of Gunnar in the comment.

I moved to MapStruct 1.2.0.Beta1 and created a UserMapperResolver like below

@Component
public class UserMapperResolver {

    @Autowired
    private UserRepository userRepository;

    @ObjectFactory
    public User resolve(BaseUserDto dto, @TargetType Class type) {
        return dto != null && dto.getId() != null ? userRepository.findOne(dto.getId()) : new User();
    }

}

Which I use then in my UserMapper :

@Mapper(uses = { UserMapperResolver.class })
public interface BaseUserMapper {

    BaseUserDto map(User user);

    User map(BaseUserDto baseUser);

}

The generated code is now :

@Override
    public User map(BaseUserDto baseUser) {
        if ( baseUser == null ) {
            return null;
        }

        User user = userMapperResolver.resolve( baseUser, User.class );

        user.setId( baseUser.getId() );
        user.setSocialMediaProvider( baseUser.getSocialMediaProvider() );
...
}

Works well !