How to get the objectid after an insert in mongodb?

by wilmer.lemke , in category: PHP Databases , 2 years ago

How to get the objectid after an insert in mongodb?

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2 answers

Member

by jerad , a year 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:

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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.

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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.

Member

by samara , 8 months 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:

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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: '[email protected]' };
    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.