How to get the objectid after an insert in mongodb?
How to get the objectid after an insert in mongodb?
2 answers
by
jerad ,
2 years ago
@wilmer.lemke
To get the _id of the inserted document in MongoDB, you can use the insertOne() or insertMany() method, which returns an object containing the _id of the inserted document(s).
Here is an example of how to use the insertOne() method to insert a new document into a collection and get its _id:
1 2 3 4 5 6 7 8 9 10 11 |
const MongoClient = require('mongodb').MongoClient; const uri = "mongodb+srv://<username>:<password>@cluster0.mongodb.net/test?retryWrites=true&w=majority"; const client = new MongoClient(uri, { useNewUrlParser: true }); client.connect(err => { const collection = client.db("test").collection("devices"); // Insert a single document collection.insertOne({ name: "Apple iPhone X" }, (err, result) => { console.log(result.insertedId); client.close(); }); }); |
The insertedId field of the result object returned by the insertOne() method contains the _id of the inserted document.
You can use the insertMany() method in a similar way to insert multiple documents and get their _ids. The insertedIds field of the result object returned by the insertMany() method contains an array of the _ids of the inserted documents.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
const MongoClient = require('mongodb').MongoClient; const uri = "mongodb+srv://<username>:<password>@cluster0.mongodb.net/test?retryWrites=true&w=majority"; const client = new MongoClient(uri, { useNewUrlParser: true }); client.connect(err => { const collection = client.db("test").collection("devices"); // Insert multiple documents collection.insertMany([ { name: "Apple iPhone X" }, { name: "Google Pixel 3" }, { name: "OnePlus 6T" } ], (err, result) => { console.log(result.insertedIds); client.close(); }); }); |
Note that the _id field is automatically generated by MongoDB if you don't specify a value for it when inserting a new document. The _id field is a unique identifier for each document in a collection and is used to distinguish documents from one another.
by
samara ,
2 years ago
@wilmer.lemke
In MongoDB, the command insertOne() or insertMany() for inserting documents into a collection returns an InsertOneResult or InsertManyResult object respectively. The InsertOneResult object contains information about the inserted document, including the _id field.
To retrieve the _id of the inserted document, you can use the InsertedId property of the InsertOneResult object.
Here's an example using the MongoDB Node.js Driver:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
const { MongoClient } = require('mongodb'); async function insertDocument() { const uri = 'mongodb://localhost:27017'; const client = new MongoClient(uri); try { await client.connect(); const database = client.db('your_database_name'); const collection = database.collection('your_collection_name'); const document = { name: 'John Doe', age: 30, email: 'john@example.com' }; const result = await collection.insertOne(document); // Retrieve the _id of the inserted document const insertedId = result.insertedId; console.log('Inserted document id:', insertedId); } catch (err) { console.error('Error:', err); } finally { await client.close(); } } insertDocument(); |
This code connects to the MongoDB server, inserts a document into a collection, and then retrieves the _id of the inserted document using result.insertedId. After that, you can use the insertedId variable as required.