Bulk.find.updateOne()

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Description

Behavior
Example

Tip

MongoDB also provides the db.collection.bulkWrite() method for performing bulk write operations.

Description

Bulk.find.updateOne(<update>)

Adds a single document update operation to a bulk operations list.

Use the Bulk.find() method to specify the condition that determines which document to update. The Bulk.find.updateOne() method limits the update to a single document. To update multiple documents, see Bulk.find.update().

Bulk.find.updateOne() accepts the following parameter:

Parameter

Type

Description

update

document or pipeline

The modifications to apply. Can be one of the following:

A replacement document	Contains only field and value pairs. See also `Bulk.find.replaceOne()`.
Update document	Contains only update operator expressions.
Aggregation pipeline	Contains only the following aggregation stages: `$addFields` and its alias `$set` `$project` and its alias `$unset` `$replaceRoot` and its alias `$replaceWith`.

For more information on the update modification parameter, see the db.collection.updateOne() reference page.

The sum of the associated <query> document from the Bulk.find() and the update document must be less than or equal to the maximum BSON document size.

To specify an upsert: true for this operation, use with Bulk.find.upsert().
To specify arrayFilters to update specific array elements, use with Bulk.find.arrayFilters().
To specify the index to use for the associated Bulk.find(), see Bulk.find.hint().
To replace a document wholesale, see also Bulk.find.replaceOne().

Behavior

If the <update> document contains only update operator expressions, as in:

{
  $set: { status: "D" },
  $inc: { points: 2 }
}

Then, Bulk.find.updateOne() updates only the corresponding fields, status and points, in the document.

Example

The following example initializes a Bulk() operations builder for the items collection, and adds various updateOne() operations to the list of operations.

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( { status: "D" } ).updateOne( { $set: { status: "I", points: "0" } } );
bulk.execute();

Update with Aggregation Pipeline

Update methods can accept an aggregation pipeline. For example, the following uses:

the $set stage which can provide similar behavior to the $set update operator expression,
the aggregation variable NOW, which resolves to the current datetime and can provide similar behavior to a $currentDate update operator expression. To access aggregation variables, prefix the variable with double dollar signs $$ and enclose in quotes.

var bulk = db.items.initializeUnorderedBulkOp();
bulk.find( {  status: "P" } ).updateOne(
   [
      { $set: { points: 0, lastModified: "$$NOW" } }
   ]
);
bulk.execute();

Tip

Description

Behavior

Example

Update with Aggregation Pipeline

Tip

See also: