@Override
    public ModelBO update(UserDTO userDto, long userId) throws NonExistingEntityException {
        final ModelDTO dto = castToSpecificDto(userDto);
        final ModelTable existing = castToSpecificTable(userRepository.findByUserId(userId));

        if (existing == null) {
            throw new NonExistingEntityException(String.format("User with a given id='%d' doesn't exist.", userId));
        }

        final ModelTable updated = new ModelTable(existing.getUserTablePK().getUserId(),
                dto.getEthnicity() != null ? dto.getEthnicity() : existing.getEthnicity(), dto.getHeight() != null ? dto.getHeight() : existing.getHeight(),
                dto.getBust() != null ? dto.getBust() : existing.getBust(), dto.getWaist() != null ? dto.getWaist() : existing.getWaist(),
                dto.getHips() != null ? dto.getHips() : existing.getHips(), dto.getShoes() != null ? dto.getShoes() : existing.getShoes(),
                dto.getEyes() != null ? dto.getEyes() : existing.getEyes(), dto.getHair() != null ? dto.getHair() : existing.getHair(), existing.getEmail(), // can't
                                                                                                                                                             // change
                                                                                                                                                             // email
                                                                                                                                                             // here
                existing.getPassword(), // can't change password here
                dto.getFirstName() != null ? dto.getFirstName() : existing.getFirstName(),
                dto.getLastName() != null ? dto.getLastName() : existing.getLastName(),
                dto.getDateOfBirth() != null ? dto.getDateOfBirth() : existing.getDateOfBirth(),
                dto.getGender() != null ? dto.getGender() : existing.getGender(), existing.getProfileType(), // can't
                                                                                                             // change
                                                                                                             // profile
                                                                                                             // type
                dto.getAboutMe() != null ? dto.getAboutMe() : existing.getAboutMe(), existing.getDateJoined(), // can't
                                                                                                               // change
                                                                                                               // date
                                                                                                               // joined
                dto.getContactNumber() != null ? dto.getContactNumber() : existing.getContactNumber(),
                dto.getBase() != null ? dto.getBase() : existing.getBase());

        userRepository.save(updated);
        return new ModelBO(updated);
    }