$pullAll (update operator)

Definition

$pullAll

The $pullAll operator removes all instances of the specified values from an existing array. Unlike the $pull operator that removes elements by specifying a query, $pullAll removes elements that match the listed values.

The $pullAll operator has the form:

{ $pullAll: { <field1>: [ <value1>, <value2> ... ], ... } }

To specify a <field> in an embedded document or in an array, use dot notation.

Behavior

Starting in MongoDB 5.0, update operators process document fields with string-based names in lexicographic order. Fields with numeric names are processed in numeric order. See Update Operators Behavior for details.

If a <value> to remove is a document or an array, $pullAll removes only the elements in the array that match the specified <value> exactly, including order.

Starting in MongoDB 5.0, mongod no longer raises an error when you use an update operator like $pullAll with an empty operand expression ( { } ). An empty update results in no changes and no oplog entry is created (meaning that the operation is a no-op).

Examples

Create the survey collection:

db.survey.insertOne( { _id: 1, scores: [ 0, 2, 5, 5, 1, 0 ] } )

The following operation removes all instances of the values "0" and "5" from the scores array:

db.survey.updateOne( { _id: 1 }, { $pullAll: { scores: [ 0, 5 ] } } )

After the update, the scores field no longer has any instances of "0" or "5".

{ "_id" : 1, "scores" : [ 2, 1 ] }