MongoDB Spring数据-将文档id应用于子对象id文件

请查看以下Mongo DB文档:

@Document(collection = CitizenForumMessageDocument.COLLECTION_NAME)
public class ImageDocument {

    public static final String COLLECTION_NAME = "images";

    @Id
    private String      id;   // autogenerated 
    private Image       data; // data for the client (web, mobile...)
    private ImageMeta   meta; // for internal application work (uploader ip, etc...)

    [...] // getter, setter

}

// send as is to a client
public class Image {

    private String id;

    [...]
}

是否可以将文档id应用于 Image 文档创建时的id。

我现在的做法:

public void saveUploadedImage(Client client, ImageForm form) {

    ImageDocument doc = new ImageDocument();

    dao.save(doc); // create document cause we need an id...

    try {
        doc.setImage(createImage(form, doc.getId()));
        doc.setMeta(createMeta(client, form));
    } catch(Exception e){
        dao.remove(doc);
        return; // ugly...
    }

    dao.update(doc);
}

我也可以通过在dao层中使用一些反射黑客来实现这一点,但我希望有更好的解决方案来解决这个问题。