MongoDB request DSL/opensavvy.ktmongo.dsl.aggregation.accumulators/ArithmeticValueAccumulators/sum

sum

open infix fun <T : Number> Field<Into, T>.sum(value: Value<From, Number>)(source)

open infix fun <T : Number> KProperty1<Into, T>.sum(value: Value<From, Number>)(source)

Calculates and returns the collective sum of numeric values. Non-numeric values are ignored.

Example

class User(
    val name: String,
    val balance: Int,
)

class Result(
    val totalBalance: Int,
)

users.aggregate()
    .group {
        Result::totalBalance sum of(User::balance)
    }

External resources

Official documentation