blocks|key|175277|text|collection.insert的回调还有第二个参数，它将返回插入的一个或多个文档，其中应该包含_ids。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|175278|尝试：|175279|collection.insert(objectToInsert,+function(err,docsInserted){
++++console.log(docsInserted);
});|code-block|syntax|javascript|175280|并检查控制台以了解我的意思。|175281|entityMap^0|0|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

There is a second parameter for the callback for <code>collection.insert</code> that will return the doc or docs inserted, which should have _ids.

Try:

<pre><code>collection.insert(objectToInsert, function(err,docsInserted){
 console.log(docsInserted);
});
</code></pre>

and check the console to see what I mean.

blocks|key|393321|text|比使用第二个参数进行collection.insert回调更简单的方法是使用返回_id的objectToInsert._id+(在回调函数内部，假设它是一个成功的操作)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|393322|NodeJS的Mongo驱动程序将_id字段附加到原始对象引用，因此很容易使用原始对象获取插入的id：|393323|collection.insert(objectToInsert,+function(err){
+++if+(err)+return;
+++//+Object+inserted+successfully.
+++var+objectId+=+objectToInsert._id;+//+this+will+return+the+id+of+object+inserted
});|code-block|syntax|javascript|393324|entityMap^0|A|H|14|3|18|I|0|H|3|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

A shorter way than using second parameter for the callback of <code>collection.insert</code> would be using <code>objectToInsert._id</code> that returns the <code>_id</code> (inside of the callback function, supposing it was a successful operation).

The Mongo driver for NodeJS appends the <code>_id</code> field to the original object reference, so it's easy to get the inserted id using the original object:

<pre><code>collection.insert(objectToInsert, function(err){
 if (err) return;
 // Object inserted successfully.
 var objectId = objectToInsert._id; // this will return the id of object inserted
});
</code></pre>

blocks|key|175365|text|Mongo将完整的文档作为callbackobject发送，所以您可以简单地从那里获取它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|175366|例如|175367|collection.save(function(err,room){
++var+newRoomId+=+room._id;
++});|code-block|syntax|javascript|175368|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Mongo sends the complete document as a callbackobject so you can simply get it from there only.

for example

<pre><code>collection.save(function(err,room){
 var newRoomId = room._id;
 });
</code></pre>

blocks|key|393431|text|实际上，我为insert的回调函数中的第二个参数执行了console.log()。实际上，除了插入的对象本身之外，还返回了很多信息。下面的代码解释了如何访问它的id。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393432|collection.insert(objToInsert,+function+(err,+result){
++++if(err)console.log(err);
++++else+{
++++++++console.log(result["ops"][0]["_id"]);
++++++++//+The+above+statement+will+output+the+id+of+the+
++++++++//+inserted+object
+++++++}
});|code-block|syntax|javascript|393433|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I actually did a console.log() for the second parameter in the callback function for insert. There is actually a lot of information returned apart from the inserted object itself. So the code below explains how you can access it's id. 

<pre><code>collection.insert(objToInsert, function (err, result){
 if(err)console.log(err);
 else {
 console.log(result["ops"][0]["_id"]);
 // The above statement will output the id of the 
 // inserted object
 }
});
</code></pre>

blocks|key|175473|text|现在，您可以在promise的result.insertedId中使用insertOne方法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|175474|entityMap|0|LINK|mutability|MUTABLE|url|http://mongodb.github.io/node-mongodb-native/2.1/api/Collection.html#insertOne^0|Z|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Now you can use <a href="http://mongodb.github.io/node-mongodb-native/2.1/api/Collection.html#insertOne" rel="noreferrer">insertOne</a> method and in promise's result.insertedId

blocks|key|393518|text|正如ktretyak所说，获取插入文档的ID的最好方法是在result对象上使用insertedId属性。在我的例子中，result._id不起作用，所以我不得不使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393519|db.collection("collection-name")
++.insertOne(document)
++.then(result+=>+{
++++console.log(result.insertedId);
++})
++.catch(err+=>+{
++++//+handle+error
++});|code-block|syntax|javascript|393520|如果你使用回调，事情也是一样的。|393521|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

As ktretyak said, to get inserted document's ID best way is to use insertedId property on result object. In my case result._id didn't work so I had to use following: 

<pre><code>db.collection("collection-name")
 .insertOne(document)
 .then(result =&gt; {
 console.log(result.insertedId);
 })
 .catch(err =&gt; {
 // handle error
 });
</code></pre>

It's the same thing if you use callbacks.

blocks|key|393544|text|@JSideris，获取insertedId的示例代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393545|db.collection(COLLECTION).insertOne(data,+(err,+result)+=>+{
++++if+(err)+
++++++return+err;
++++else+
++++++return+result.insertedId;
++});|code-block|syntax|javascript|393546|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

@JSideris, sample code for getting insertedId.

<pre><code>db.collection(COLLECTION).insertOne(data, (err, result) =&gt; {
 if (err) 
 return err;
 else 
 return result.insertedId;
 });
</code></pre>

blocks|key|393580|text|如果您想使用"_id“，请使用simpley|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393581|result.insertedId.toString()+|code-block|syntax|javascript|393582|//+toString将从十六进制转换|393583|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

if you want to take "_id" use simpley

<pre><code>result.insertedId.toString() 
</code></pre>

// toString will convert from hex

blocks|key|393612|text|在异步函数中执行此操作的另一种方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393613|const+express+=+require('express')
const+path+=+require('path')
const+db+=+require(path.join(__dirname,+'../database/config')).db;
const+router+=+express.Router()

//+Create.R.U.D
router.post('/new-order',+async+function+(req,+res,+next)+{

++++//+security+check
++++if+(Object.keys(req.body).length+===+0)+{
++++++++res.status(404).send({
++++++++++++msg:+"Error",
++++++++++++code:+404
++++++++});
++++++++return;
++++}

++++try+{

++++++++//+operations
++++++++let+orderNumber+=+await+db.collection('orders').countDocuments()
++++++++let+number+=+orderNumber+%2B+1
++++++++let+order+=+{
++++++++++++number:+number,
++++++++++++customer:+req.body.customer,
++++++++++++products:+req.body.products,
++++++++++++totalProducts:+req.body.totalProducts,
++++++++++++totalCost:+req.body.totalCost,
++++++++++++type:+req.body.type,
++++++++++++time:+req.body.time,
++++++++++++date:+req.body.date,
++++++++++++timeStamp:+Date.now(),

++++++++}

++++++++if+(req.body.direction)+{
++++++++++++order.direction+=+req.body.direction
++++++++}

++++++++if+(req.body.specialRequests)+{
++++++++++++order.specialRequests+=+req.body.specialRequests
++++++++}

++++++++//+Here+newOrder+will+store+some+informations+in+result+of+this+process.
++++++++//+You+can+find+the+inserted+id+and+some+informations+there+too.
++++++++
++++++++let+newOrder+=+await+db.collection('orders').insertOne({...order})

++++++++if+(newOrder)+{

++++++++++++//+MARK:+Server+response
++++++++++++res.status(201).send({
++++++++++++++++msg:+`Order+N°${number}+created+:+id[${newOrder.insertedId}]`,
++++++++++++++++code:+201
++++++++++++});

++++++++}+else+{

++++++++++++//+MARK:+Server+response
++++++++++++res.status(404).send({
++++++++++++++++msg:+`Order+N°${number}+not+created`,
++++++++++++++++code:+404
++++++++++++});

++++++++}

++++}+catch+(e)+{
++++++++print(e)
++++++++return
++++}

})

//+C.Read.U.D


//+C.R.Update.D


//+C.R.U.Delete



module.exports+=+router;|code-block|syntax|javascript|393614|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Another way to do it in async function :
<pre><code>const express = require('express')
const path = require('path')
const db = require(path.join(__dirname, '../database/config')).db;
const router = express.Router()

// Create.R.U.D
router.post('/new-order', async function (req, res, next) {

 // security check
 if (Object.keys(req.body).length === 0) {
 res.status(404).send({
 msg: &quot;Error&quot;,
 code: 404
 });
 return;
 }

 try {

 // operations
 let orderNumber = await db.collection('orders').countDocuments()
 let number = orderNumber + 1
 let order = {
 number: number,
 customer: req.body.customer,
 products: req.body.products,
 totalProducts: req.body.totalProducts,
 totalCost: req.body.totalCost,
 type: req.body.type,
 time: req.body.time,
 date: req.body.date,
 timeStamp: Date.now(),

 }

 if (req.body.direction) {
 order.direction = req.body.direction
 }

 if (req.body.specialRequests) {
 order.specialRequests = req.body.specialRequests
 }

 // Here newOrder will store some informations in result of this process.
 // You can find the inserted id and some informations there too.
 
 let newOrder = await db.collection('orders').insertOne({...order})

 if (newOrder) {

 // MARK: Server response
 res.status(201).send({
 msg: `Order N°${number} created : id[${newOrder.insertedId}]`,
 code: 201
 });

 } else {

 // MARK: Server response
 res.status(404).send({
 msg: `Order N°${number} not created`,
 code: 404
 });

 }

 } catch (e) {
 print(e)
 return
 }

})

// C.Read.U.D


// C.R.Update.D


// C.R.U.Delete



module.exports = router;
</code></pre>

blocks|key|175679|text|与其他响应类似，您可以使用async+await、es6%2B特性来获取变量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|175680|​|175681|const+insertData+=+async+(data)+=>+{

++const+{+ops+}+=+await+db.collection('collection').insertOne(data)
++console.log(ops[0]._id)
++
}|code-block|syntax|javascript|175682|175683|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

Similar to other responses, you can grab the variable using async await, es6+ features.
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const insertData = async (data) =&gt; {

 const { ops } = await db.collection('collection').insertOne(data)
 console.log(ops[0]._id)
 
}</code></pre>
</div>
</div>

I use NodeJS to insert documents in MongoDB. Using <code>collection.insert</code> I can insert a document into database like in this code:

<pre><code>// ...
collection.insert(objectToInsert, function(err){
 if (err) return;
 // Object inserted successfully.
 var objectId; // = ???
});
// ...
</code></pre>

How can I get the <code>_id</code> of inserted object?

Is there any way to get the <code>_id</code> without getting latest object inserted <code>_id</code>?

Supposing that in same time a lot of people access the database, I can't be sure that the latest id is the id of object inserted.

Get the _id of inserted document in Mongo database in NodeJS

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我使用NodeJS在MongoDB中插入文档。使用collection.insert，我可以将文档插入到数据库中，如以下代码所示：// ...collection.insert(objectToInsert, function(err){   if (err) return;   // Object inserted ...

问在NodeJS中获取Mongo数据库中插入文档的_id
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问在NodeJS中获取Mongo数据库中插入文档的_id
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