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Field Update Operators

Note

For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.

Name Description
$currentDate Sets the value of a field to current date, either as a Date or a Timestamp.
$inc Increments the value of the field by the specified amount.
$min Only updates the field if the specified value is less than the existing field value.
$max Only updates the field if the specified value is greater than the existing field value.
$mul Multiplies the value of the field by the specified amount.
$rename Renames a field.
$set Sets the value of a field in a document.
$setOnInsert Sets the value of a field if an update results in an insert of a document. Has no effect on update operations that modify existing documents.
$unset Removes the specified field from a document.