optionalReferencedOn
infix fun <REF : Comparable<REF>> optionalReferencedOn(column: Column<REF?>): OptionalReference<REF, ID, T>
Registers an optional reference as a field of the child entity class, which returns a parent object of this EntityClass.
The reference should have been defined by the creation of a column using either optReference() or reference().nullable() on the child table.
Samples
org.jetbrains.exposed.sql.tests.shared.entities.EntityTests.Boardorg.jetbrains.exposed.sql.tests.shared.entities.EntityTests.Postsorg.jetbrains.exposed.sql.tests.shared.entities.EntityTests.PostRegisters an optional reference as a field of the child entity class, which returns a parent object of this EntityClass.
The reference should have been defined by the creation of a foreign key constraint on the child table, by using foreignKey().