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

toLong

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

Converts this value to an Long (BsonType.Int64).

Conversion algorithm

BsonType.Int64 is returned as itself.

BsonType.Int32 is extended to a Long.

BsonType.Boolean becomes 1 if true and 0 if false.

BsonType.Double and BsonType.Decimal128 are truncated to an integer value. If this value does not fall in the valid range for a long, an exception is thrown.

BsonType.String is parsed as a double. Only base 10 numbers can be parsed. If the value is outside the range of a double, an exception is thrown. "-5" and "123456" are two valid examples. Floating-point numbers are not supported (use toDouble).

BsonType.Datetime returns the number of milliseconds since the epoch.

BsonType.Null always returns null.

Other types throw an exception.

Example

class Product(
    val quantity: Double,
)

users.aggregate()
    .set {
        Field.unsafe<Long>("quantity") set of(Product::quantity).toLong()
    }

External resources

• Official documentation

See also

• TypeValueOperators.type Get the value's type.