Bulk.find.updateOne()¶

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Description
Behavior
Example

Tip

Starting in version 3.2, 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.

Behavior¶

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

copy

{
  $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.

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

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