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collection.findOneAndUpdate()

Definition

collection.findOneAndUpdate()

Update a single document in a collection or view based on a query filter and return the document in either its pre-update or post-update form. Unlike collection.updateOne(), this action allows you to atomically find, update, and return a document with the same command. This avoids the risk of other update operations changing the document between separate find and update operations.

Usage

Example

To call the collection.findOneAndUpdate() action from a Function, get a collection handle with database.collection() then call the handle’s findOneAndUpdate() method.

// Find the document that describes "legos"
const query = { "name": "legos" };
// Set some fields in that document
const update = {
  "$set": {
    "name": "blocks",
    "price": 20.99,
    "category": "toys"
  }
};
// Return the updated document instead of the original document
const options = { returnNewDocument: true };

return itemsCollection.findOneAndUpdate(query, update, options)
  .then(updatedDocument => {
    if(updatedDocument) {
      console.log(`Successfully updated document: ${updatedDocument}.`)
    } else {
      console.log("No document matches the provided query.")
    }
    return updatedDocument
  })
  .catch(err => console.error(`Failed to find and update document: ${err}`))

Parameters

The collection.findOneAndUpdate() action has the following form:

findOneAndUpdate(query, update, options)
Parameter Description

Query Filter

query: <document>

Required. A standard MongoDB query document that specifies which document to update. You can use most query selectors except for evaluation, geospatial, or bitwise selectors.

If multiple documents match the query, only the first document in sort order or natural order will be updated.

Update Operation

update: <document>
Required. A standard MongoDB update document that specifies the update operation to perform on the document that matches the query. You can use most update operators.

Update Options

options: <document>

A document that specifies configuration options for the query. The options document has the following form:

{
   "upsert": <boolean>,
   "sort": <document>,
   "projection": <document>,
   "returnNewDocument": <boolean>
}

Upsert

options.upsert: <boolean>
Optional. Default: false. A boolean that, if true, indicates that MongoDB should insert a new document that matches the query filter when the query does not match any existing documents in the collection.

Sort

options.sort: <document>

Optional. Specifies the query sort order. Sort documents specify one or more fields to sort on where the value of each field indicates whether MongoDB should sort it in ascending (1) or descending (-1) order. The sort order determines which document collection.findOneAndUpdate() affects.

Example

The following sort document specifies that documents should be sorted first by age from highest to lowest. Once sorted by age, the result set should further be sorted by name in alphabetical order for each distinct age value.

{ age: -1, name: 1 }

Projection

options.projection: <document>

Optional. A document that specifies which fields MongoDB should return or withhold in each document that matches the query.

To return all fields in the matching documents, omit this parameter or specify an empty projection document ({}).

To return specific fields and the document’s _id, specify the fields in the projection document with a value of 1:

// Includes the field in returned documents
{ <Field Name>: 1 }

To withhold specific fields, specify the fields in the projection document with a value of 0:

// Withholds the field from returned documents
{ <Field Name>: 0 }

Note

You may specify either fields to include or fields to withhold but not both. For example, the following projection is invalid because it simultaneously includes the name field and withholds the address field:

// Invalid
// Can't simultaneously include and withhold
{ "name": 1, "address": 0 }

The exception to this rule is the _id field, which you may withhold from any query:

// Valid
// Can exclude _id while including other fields
{ "_id": 0, "name": 1 }

Return New Document

options.returnNewDocument: <boolean>
Optional. Default: false. A boolean that, if true, indicates that the action should return the document in its updated form instead of its original, pre-update form.

Return Value

Note

You can specify whether to return the pre-replacement or post-replacement version of the document by setting the value of options.returnNewDocument. By default, returnNewDocument is false, which indicates that the promise should resolve to the pre-update version of the document.

The collection.findOneAndUpdate() action returns a Promise that resolves to a single document that the query overwrote. If no documents match the specified query, the promise resolves to null.

Promise<document|null>