Mongoose与mongodb如何返回刚刚保存的对象？ [英] Mongoose with mongodb how to return just saved object?

问题描述

我是mongoose / mongodb的新手

I'm new to mongoose/mongodb

说我保存了一些东西：

var instance = new TestingModel();
instance.test = 'blah2';
instance.save();

因此，当我保存数据库中的实例obj将具有，_id和test时。但只有在进入db后才会将_id属性添加到对象中。注意：我之前不想给它一个id。但是，我想抓住数据库中的对象，因为我需要使用_id值，但我不想再次查询它。有没有办法将对象保存在数据库中并自动返回数据库对象以便获取_id值？

So when I save that the instance obj in the db will have, _id and test. But the _id attribute is added to the object only after entering the db. Note: I don't want to give it an id before. However, I want to grab the object in the db because I need to use the _id value, but I don't want to query it again. Is there a way where you save the object in the database and auto returns the database object so you can get the _id value?

推荐答案

保存后应存在 _id ：

var instance = new TestingModel()

instance.test = 'blah'

instance.save(function(err){
    console.log(instance._id) // => 4e7819d26f29f407b0...
})

编辑：实际上 _id 是在实例化时设置的，所以在保存之前它应该已存在：

edit: actually the _id is set on instantiation, so it should already be there before save:

var instance = new TestingModel()
console.log(instance._id) // => 4e7819d26f29f407b0...

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