exposed-dao-r2dbc/org.jetbrains.exposed.v1.dao.r2dbc/OptionalReference

OptionalReference

class OptionalReference<ID : Any, Parent : Entity<ID>, REF : Any>(val reference: Column<REF?>, val factory: EntityClass<ID, Parent>, val references: Map<Column<*>, Column<*>>? = null)

Class representing an optional table relation between two Entity classes, which is responsible for retrieving the parent entity optionally referenced by the child entity. R2DBC counterpart of JDBC's OptionalReference; the property delegate yields an OptionalAccessor for suspending lookups.

Parameters

reference

The nullable reference column defined on the child entity's associated table.

factory

The EntityClass associated with the parent entity optionally referenced by the child entity.

Constructors

OptionalReference

constructor(reference: Column<REF?>, factory: EntityClass<ID, Parent>, references: Map<Column<*>, Column<*>>? = null)

Properties

factory

val factory: EntityClass<ID, Parent>

reference

val reference: Column<REF?>

references

val references: Map<Column<*>, Column<*>>?

Composite-FK child→parent column map (mirrors JDBC's OptionalReference.references).

Functions

provideDelegate

operator fun <SRC : Entity<*>> provideDelegate(thisRef: SRC, property: KProperty<*>): OptionalAccessor<ID, Parent, REF>

Wires up the property delegate by returning an OptionalAccessor bound to the source thisRef entity.