How to get the objectid after an insert in mongodb?
How to get the objectid after an insert in mongodb?
1 answer
@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.