OptionalBackReference
class OptionalBackReference<ParentID : Any, out Parent : Entity<ParentID>, ChildID : Any, in Child : Entity<ChildID>, REF>(reference: Column<REF?>, factory: EntityClass<ParentID, Parent>, references: Map<Column<*>, Column<*>>? = null)
What a one-to-one relationship declared with optionalBackReferencedOn gives back: the single child entity that references this one, or null if there is none.
class Film(id: EntityID<Int>) : IntEntity(id) {
val review by Review optionalBackReferencedOn Reviews.film
companion object : IntEntityClass<Film>(Films)
}
val stars = film.review()?.starsContent copied to clipboard
The property is invoked rather than read directly because the lookup suspends.
Parameters
reference
The nullable reference column defined on the child entity's associated table.
factory
The EntityClass associated with the child entity that optionally references the parent entity.