MongoDB request DSL • opensavvy.ktmongo.dsl.aggregation.operators • TypeValueOperators • toObjectId

toObjectId

open fun <R : Any> Value<R, *>.toObjectId(): Value<R, >

Converts this value to an ObjectId.

Conversion algorithm

BsonType.ObjectId is returned as itself.

BsonType.String is parsed as an ObjectId as a 24-character hexadecimal representation, for example "5ab9cbfa31c2ab715d42129e".

BsonType.Null always returns null.

Other types throw an exception.

Example

class Product(
    val _id: ObjectId,
)

// Migrate ids which were accidentally written as strings:
products.updateManyWithPipeline {
    _id set of(Product::_id).toObjectId()
}

External resources

• Official documentation

See also

• TypeValueOperators.type Get the value's type.