collection.findOneAndDelete()¶

Definition¶

collection.findOneAndDelete()¶

Remove a single document from a collection based on a query filter and return a document with the same form as the document immediately before it was deleted. Unlike collection.deleteOne(), this action allows you to atomically find and delete a document with the same command. This avoids the risk of other update operations changing the document between separate find and delete operations.

Usage¶

Example¶

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

// Find the first document that has a quantity greater than 25
const query = { "quantity": { "$gte": 25 } };
// Sort the documents in order of descending quantity before
// deleting the first one.
const options = {
  "sort": { "quantity": -1 }
}
return itemsCollection.findOneAndDelete(query, options)
  .then(deletedDocument => {
    if(deletedDocument) {
      console.log(`Successfully deleted document that had the form: ${deletedDocument}.`)
    } else {
      console.log("No document matches the provided query.")
    }
    return deletedDocument
  })
  .catch(err => console.error(`Failed to find and delete document: ${err}`))

Parameters¶

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

findOneAndDelete(query, options)

Parameter

Description

Query Filter

query: <document>

Required. A standard MongoDB query document that specifies which document to delete. 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.

Delete Options

options: <document>

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

{
   "sort": <document>,
   "projection": <document>
}

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.findOneAndReplace() 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 Value¶

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

Promise<document|null>

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