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Usage Examples

Replace a Document

On this page

  • Example
  • Expected Result
  • Additional Information
  • API Documentation

You can replace one document with another by using the ReplaceOne() synchronous method or the ReplaceOneAsync() asynchronous method on a collection object.

Example

The following code replaces the first document in the restaurants collection that has a value of "Pizza" in the cuisine field. After the replacement, this document will have a name field with a value of "Mongo's Pizza" and new values for the address and borough fields.

Select the Asynchronous or Synchronous tab to see the corresponding code.

// Creates a filter for all restaurant documents that have a "cuisine" value of "Pizza"
var filter = Builders<Restaurant>.Filter
    .Eq(r => r.Cuisine, "Pizza");
// Finds the ID of the first restaurant document that matches the filter
var oldPizzaRestaurant = _restaurantsCollection.Find(filter).First();
var oldId = oldPizzaRestaurant.Id;
// Generates a new restaurant document
Restaurant newPizzaRestaurant = new()
{
    Id = oldId,
    Name = "Mongo's Pizza",
    Cuisine = "Pizza",
    Address = new()
    {
        Street = "Pizza St",
        ZipCode = "10003"
    },
    Borough = "Manhattan",
};
// Asynchronously replaces the existing restaurant document with the new document
return await _restaurantsCollection.ReplaceOneAsync(filter, newPizzaRestaurant);

For a fully runnable example of the ReplaceOneAsync() operation, see the ReplaceOneAsync code sample.

// Creates a filter for all restaurant documents that have a "cuisine" value of "Pizza"
var filter = Builders<Restaurant>.Filter
    .Eq(r => r.Cuisine, "Pizza");
// Finds the ID of the first restaurant document that matches the filter
var oldPizzaRestaurant = _restaurantsCollection.Find(filter).First();
var oldId = oldPizzaRestaurant.Id;
// Generates a new restaurant document
Restaurant newPizzaRestaurant = new()
{
    Id = oldId,
    Name = "Mongo's Pizza",
    Cuisine = "Pizza",
    Address = new()
    {
        Street = "Pizza St",
        ZipCode = "10003"
    },
    Borough = "Manhattan",
};
// Replaces the existing restaurant document with the new document
return _restaurantsCollection.ReplaceOne(filter, newPizzaRestaurant);

For a fully runnable example of the ReplaceOne() operation, see the ReplaceOne code sample.

Expected Result

Running either of the preceding full examples prints the following results:

First pizza restaurant before replacement: J&V Famous Pizza
Restaurants modified by replacement: 1
First pizza restaurant after replacement: Mongo's Pizza
Resetting sample data...done.

Additional Information

To learn more about replacing documents, see the Replace Operation guide.

To learn more about using builders, see Operations with Builders.

API Documentation

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Update Many Documents