node.js 在 Mongoose 中保存对象后如何获取 objectID？
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How do I get the objectID after I save an object in Mongoose?
提问by TIMEX
var n = new Chat();
n.name = "chat room";
n.save(function(){
//console.log(THE OBJECT ID that I just saved);
});
I want to console.log the object id of the object I just saved. How do I do that in Mongoose?
我想在 console.log 中记录我刚刚保存的对象的对象 ID。我如何在猫鼬中做到这一点？
回答by Richard Holland
This just worked for me:
这对我有用：
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
mongoose.connect('mongodb://localhost/lol', function(err) {
if (err) { console.log(err) }
});
var ChatSchema = new Schema({
name: String
});
mongoose.model('Chat', ChatSchema);
var Chat = mongoose.model('Chat');
var n = new Chat();
n.name = "chat room";
n.save(function(err,room) {
console.log(room.id);
});
$ node test.js
4e3444818cde747f02000001
$
I'm on mongoose 1.7.2 and this works just fine, just ran it again to be sure.
我在 mongoose 1.7.2 上，这很好用，只需再次运行以确保。
回答by Anathema.Imbued
Mongo sends the complete document as a callbackobject so you can simply get it from there only.
Mongo 将完整文档作为回调对象发送，因此您只能从那里获取它。
for example
例如
n.save(function(err,room){
var newRoomId = room._id;
});
回答by yue
you can get objectid in mongoosejs after you new some model.
新建一些模型后，您可以在 mongoosejs 中获得 objectid。
i'm using this code work in mongoose 4, you can try it in other version
我在 mongoose 4 中使用此代码工作，您可以在其他版本中尝试
var n = new Chat();
var _id = n._id;
or
或者
n.save((function (_id) {
return function () {
console.log(_id);
// your save callback code in here
};
})(n._id));
回答by Glenn
You can manually generate the _id then you don't have to worry about pulling it back out later.
您可以手动生成 _id，然后您不必担心稍后将其拉回。
var mongoose = require('mongoose');
var myId = mongoose.Types.ObjectId();
// then set it manually when you create your object
_id: myId
// then use the variable wherever
回答by rotimi-best
With saveall you just need to do is:
有了save你只需要做的一切：
n.save((err, room) => {
if (err) return `Error occurred while saving ${err}`;
const { _id } = room;
console.log(`New room id: ${_id}`);
return room;
});
Just in case someone is wondering how to get the same result using create:
以防万一有人想知道如何使用create以下方法获得相同的结果：
const array = [{ type: 'jelly bean' }, { type: 'snickers' }];
Candy.create(array, (err, candies) => {
if (err) // ...
const [jellybean, snickers] = candies;
const jellybeadId = jellybean._id;
const snickersId = snickers._id;
// ...
});
回答by Roddy P. Carbonell
Well, I have this:
嗯，我有这个：
TryThisSchema.post("save", function(next) {
console.log(this._id);
});
Notice the "post" in the first line. With my version of Mongoose, I have no trouble getting the _id value after the data is saved.
注意第一行中的“post”。使用我的 Mongoose 版本，我可以在保存数据后轻松获取 _id 值。
回答by Julian Orinyol
Other answers have mentioned adding a callback, I prefer to use .then()
其他答案提到添加回调，我更喜欢使用 .then()
n.name = "chat room";
n.save()
.then(chatRoom => console.log(chatRoom._id));
example from the docs:.
文档中的示例：。
var gnr = new Band({
name: "Guns N' Roses",
members: ['Axl', 'Slash']
});
var promise = gnr.save();
assert.ok(promise instanceof Promise);
promise.then(function (doc) {
assert.equal(doc.name, "Guns N' Roses");
});
