db.collection.findOneAndUpdate()

The selection criteria for the update. The same query selectors as in the find() method are available.

To update the first document returned in the collection, specify an empty document { }.

If unspecified, defaults to an empty document.

If the query field is not a document, the operation returns an error.

If no document matches the filter, no document is updated.

The update document or an aggregation pipeline.

• If passed a document with update operator expressions, db.collection.findOneAndUpdate() performs the specified modification.

  The document must contain only update operators. You cannot specify a replacement document { <field1>: <value1>, ...}. To use a replacement document, see db.collection.findOneAndReplace() instead.

• If passed an aggregation pipeline [ <stage1>, <stage2>, ... ], db.collection.findOneAndUpdate() modifies the document per the pipeline. The pipeline can consist of the following stages:

  • $addFields and its alias $set

  • $project and its alias $unset

  • $replaceRoot and its alias $replaceWith.

Optional. A document expressing the write concern. Omit to use the default write concern.

{ w: <value>, j: <boolean>, wtimeout: <number> }

Do not explicitly set the write concern for the operation if run in a transaction. To use write concern with transactions, see Transactions and Write Concern.

Optional. A subset of fields to return.

To return all fields in the returned document, omit this parameter.

If the projection argument is not a document, the operation errors.

Optional. Specifies a sorting order for the documents matched by the filter.

If the sort argument is not a document, the operation errors.

See cursor.sort().

Optional. When true, findOneAndUpdate() either:

• Creates a new document if no documents match the filter. For more details see upsert behavior. Returns null after inserting the new document, unless returnNewDocument is true.

• Updates a single document that matches the filter.

To avoid multiple upserts, ensure that the filter field(s) are uniquely indexed.

Defaults to false, which does not insert a new document when no match is found.

Optional. Starting in mongosh 0.13.2, returnDocument is an alternative for returnNewDocument. If both options are set, returnDocument takes precedence.

returnDocument: "before" returns the original document. returnDocument: "after" returns the updated document.

Optional. When true, returns the updated document instead of the original document.

Defaults to false.

Optional.

Specifies the collation to use for the operation.

Collation allows users to specify language-specific rules for string comparison, such as rules for lettercase and accent marks.

The collation option has the following syntax:

collation: {
   locale: <string>,
   caseLevel: <boolean>,
   caseFirst: <string>,
   strength: <int>,
   numericOrdering: <boolean>,
   alternate: <string>,
   maxVariable: <string>,
   backwards: <boolean>
}

When specifying collation, the locale field is mandatory; all other collation fields are optional. For descriptions of the fields, see Collation Document.

If the collation is unspecified but the collection has a default collation (see db.createCollection()), the operation uses the collation specified for the collection.

If no collation is specified for the collection or for the operations, MongoDB uses the simple binary comparison used in prior versions for string comparisons.

You cannot specify multiple collations for an operation. For example, you cannot specify different collations per field, or if performing a find with a sort, you cannot use one collation for the find and another for the sort.

Optional. An array of filter documents that determine which array elements to modify for an update operation on an array field.

In the update document, use the $[<identifier>] filtered positional operator to define an identifier, which you then reference in the array filter documents. You cannot have an array filter document for an identifier if the identifier is not included in the update document.

The <identifier> must begin with a lowercase letter and contain only alphanumeric characters.

You can include the same identifier multiple times in the update document; however, for each distinct identifier ($[identifier]) in the update document, you must specify exactly one corresponding array filter document. That is, you cannot specify multiple array filter documents for the same identifier. For example, if the update statement includes the identifier x (possibly multiple times), you cannot specify the following for arrayFilters that includes 2 separate filter documents for x:

// INVALID
[
  { "x.a": { $gt: 85 } },
  { "x.b": { $gt: 80 } }
]

However, you can specify compound conditions on the same identifier in a single filter document, such as in the following examples:

// Example 1
[
  { $or: [{"x.a": {$gt: 85}}, {"x.b": {$gt: 80}}] }
]
// Example 2
[
  { $and: [{"x.a": {$gt: 85}}, {"x.b": {$gt: 80}}] }
]
// Example 3
[
  { "x.a": { $gt: 85 }, "x.b": { $gt: 80 } }
]

For examples, see Array Update Operations with arrayFilters.

arrayFilters is not available for updates that use an aggregation pipeline.