Bulk.find.update()¶

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Description
Example

Tip

Starting in version 3.2, MongoDB also provides the db.collection.bulkWrite() method for performing bulk write operations.

Description¶

Bulk.find.update(<update>)¶

Adds a multi update operation to a bulk operations list. The method updates specific fields in existing documents.

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

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

Parameter Type Description

update

document or pipeline

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

Update document Contains only update operator expressions.

Aggregation pipeline

Starting in MongoDB 4.2

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.updateMany 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(). With Bulk.find.upsert(), if no documents match the Bulk.find() query condition, the update operation inserts only a single document.
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 Bulk.find.replaceOne().

Example¶

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

copy

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

Update with Aggregation Pipeline¶

Starting in version 4.2, 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.

copy

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