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Replace a Document

You can replace a single document using the collection.replaceOne() method. replaceOne() accepts a query document and a replacement document. If the query matches a document in the collection, it replaces the first document that matches the query with the provided replacement document. This operation removes all fields and values in the original document and replaces them with the fields and values in the replacement document. The value of the _id field remains the same unless you explicitly specify a new value for _id in the replacement document.

You can specify more options, such as upsert, using the optional options parameter. If you set the upsert option field to true the method inserts a new document if no document matches the query.

The replaceOne() method throws an exception if an error occurs during execution. For example, if you specify a value that violates a unique index rule, replaceOne() throws a duplicate key error.

Note

If your application requires the document after updating, use the collection.findOneAndReplace() method which has a similar interface to replaceOne(). You can configure findOneAndReplace() to return either the original matched document or the replacement document.

Note

You can use this example to connect to an instance of MongoDB and interact with a database that contains sample data. To learn more about connecting to your MongoDB instance and loading a sample dataset, see the Usage Examples guide.

1import { MongoClient } from "mongodb";
2
3// Replace the uri string with your MongoDB deployment's connection string.
4const uri = "<connection string uri>";
5
6const client = new MongoClient(uri);
7
8async function run() {
9 try {
10
11 // Get the database and collection on which to run the operation
12 const database = client.db("sample_mflix");
13 const movies = database.collection("movies");
14
15 // Create a query for documents where the title contains "The Cat from"
16 const query = { title: { $regex: "The Cat from" } };
17
18 // Create the document that will replace the existing document
19 const replacement = {
20 title: `The Cat from Sector ${Math.floor(Math.random() * 1000) + 1}`,
21 };
22
23 // Execute the replace operation
24 const result = await movies.replaceOne(query, replacement);
25
26 // Print the result
27 console.log(`Modified ${result.modifiedCount} document(s)`);
28 } finally {
29 await client.close();
30 }
31}
32run().catch(console.dir);
1import { MongoClient } from "mongodb";
2
3// Replace the uri string with your MongoDB deployment's connection string.
4const uri = "<connection string uri>";
5
6const client = new MongoClient(uri);
7
8interface Movie {
9 title: string;
10}
11
12async function run() {
13 try {
14 const database = client.db("sample_mflix");
15 const movies = database.collection<Movie>("movies");
16
17 const result = await movies.replaceOne(
18 { title: { $regex: "The Cat from" } },
19 {
20 title: `The Cat from Sector ${Math.floor(Math.random() * 1000) + 1}`,
21 }
22 );
23 console.log(`Modified ${result.modifiedCount} document(s)`);
24 } finally {
25 await client.close();
26 }
27}
28run().catch(console.dir);

Running the preceding example, you see the following output:

Modified 1 document(s)

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