保存后填充猫鼬

我无法手动或自动在新保存的对象上填充创建者字段……我唯一能找到的方法是重新查询我已经想要做的对象.

I cannot manually or automatically populate the creator field on a newly saved object ... the only way I can find is to re-query for the objects I already have which I would hate to do.

这是设置:

var userSchema = new mongoose.Schema({   
  name: String,
});
var User = db.model('User', userSchema);

var bookSchema = new mongoose.Schema({
  _creator: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
  description: String,
});
var Book = db.model('Book', bookSchema);

这是我拉头发的地方

var user = new User();
user.save(function(err) {
    var book = new Book({
        _creator: user,
    });
    book.save(function(err){
        console.log(book._creator); // is just an object id
        book._creator = user; // still only attaches the object id due to Mongoose magic
        console.log(book._creator); // Again: is just an object id
        // I really want book._creator to be a user without having to go back to the db ... any suggestions?
    });
});

最新的猫鼬解决了该问题并添加了填充功能，请参见新的接受的答案.

latest mongoose fixed this issue and added populate functionality, see the new accepted answer.