How can we modify documents?

Q: How can we modify documents?

updateOne() updateMany() replaceOne() **$set:** replaces the value of a field with a specified one **$inc:** increments or decrements field values **$rename:** renames fields **$unset:** removes fields **$mul:** multiplies a field value by a specified number // Replaces the value of a field with a specified value. db.collection('users').updateOne({ _id: 1 }, { $set: { status: 'Active' } }); //Increments or decrements a field value by a number. db.collection('stats').updateOne({ _id: 1 }, { $inc: { loginCount: 1, points: -5 } }); // Renames an existing field to a new name. db.collection('inventory').updateOne({ _id: 1 }, { $rename: { 'qty': 'quantity' } }); // $unset: Deletes a specific field from a document. db.collection('users').updateOne({ _id: 1 }, { $unset: { tempToken: "" } }); // $mul: Multiplies the field value by a specified number. db.collection('products').updateOne({ _id: 1 }, { $mul: { price: 1.10 } });

Difficulty: 5/10

update operators, upserts & atomicity, schema migration

Update operations modify the fields and values of a document while keeping other fields and values unchanged. Replace operations substitute all fields and values in an existing document with specified fields and values while keeping the _id field value unchanged.

The Node.js driver provides the following methods to change documents:

1
updateOne()
2
updateMany()
3
replaceOne()

The top level of an update document contains one or more of the following update operators:

1
$set: replaces the value of a field with a specified one
2
$inc: increments or decrements field values
3
$rename: renames fields
4
$unset: removes fields

javascript

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0-2 years experience

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