section28.6.md

Section 28.6: Update a document

Find a document with the property { greetings: 'Hellu' } and change it to { greetings: 'Whut?' }

const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017/test';

MongoClient.connect(url, function (err, db) {
  if (err) throw new Error(err);
  db.collection('myCollection')
    .updateOne(
      { // Update method 'updateOne'
        greetings: "Hellu" 
      },
      { $set: { greetings: "Whut?" }},
      function (err, result) {
        if (err) throw new Error(err);
        db.close(); // Don't forget to close the connection when you are done
      }
    );
});

Collection method updateOne()

db.collection(collection).updateOne(filter, update, options. callback);

Parameter	Type	Description
filter	object	Specifies the selection critera
update	object	Specifies the modifications to apply
options	object	(optional) Optional settings (default: null)
callback	Function	Function to be called when the operation is done

The callback function takes two arguments

• err : Error - If an error occurs the err argument will be defined
• db : object - The MongoDB instance