client/io.github.octaviusframework.client.transaction/TransactionValue

TransactionValue

A parameter of a TransactionPlan step whose value may not exist until an earlier step runs - the id an earlier insert generates. It is resolved when the step runs; anything else in a parameter map is passed through as it is.

Type Parameters

The type the value will have once resolved.

Inheritors

Value

FromStep

Transformed

Constructors

TransactionValue

protected constructor()

Types

FromStep

data class FromStep<out T>(val handle: StepHandle<T>) : TransactionValue<T>

An earlier step's result, as its terminal produced it: a Row after fetchRowStrict, a Senator after fetchObjectStrict<Senator>. map takes a part of it.

Transformed

class Transformed<IN, out OUT>(val source: TransactionValue<IN>, val transform: (IN) -> OUT) : TransactionValue<OUT>

source with transform applied once it resolves.

Value

data class Value<out T>(val value: T) : TransactionValue<T>

A value known all along. toTransactionValue is shorter.

Functions

map

fun <IN, OUT> TransactionValue<IN>.map(transformation: (IN) -> OUT): TransactionValue<OUT>

Applies transformation to this value once it resolves, so a row becomes the column the next step needs without a step of its own:

spread

fun TransactionValue<Map<String, Any?>>.spread(): SpreadParameters

Spreads this map into parameters under its own keys. The name it was filed under is only a placeholder and is not bound.