- Reference >
- Operators >
- Update Operators >
- Field Update Operators >
- $unset
$unset¶
- $unset¶
The $unset operator deletes a particular field. Consider the following syntax:
{ $unset: { <field1>: "", ... } }
The specified value in the $unset expression (i.e. "") does not impact the operation.
To specify a <field> in an embedded document or in an array, use dot notation.
Behavior¶
If the field does not exist, then $unset does nothing (i.e. no operation).
When used with $ to match an array element, $unset replaces the matching element with null rather than removing the matching element from the array. This behavior keeps consistent the array size and element positions.