Functional approach to insertOrUpdate

FruitRepository.kt

import arrow.core.None
import arrow.core.Option
import arrow.core.Some

fun insertOrUpdate(fruit: FruitMetadata): Int =
    findByAuthorityId(fruit.fruitAuthorityId)
        .fold({ findByCouncilId(fruit.fruitCouncilId) }, ::Some)
        .fold({ findByName(fruit.name) }, ::Some)
        .fold({ insert(fruit) }, { update(it, fruit) })

fun findByAuthorityId(authorityId: Int): Option<Int> = None
fun findByCouncilId(councilId: Int): Option<Int> = None
fun findByName(name: String): Option<Int> = None
fun insert(fruit: FruitMetadata): Int = 1
fun update(id: Int, fruit: FruitMetadata): Int = id

data class FruitMetadata(val color: String, val fruitAuthorityId: Int, val fruitCouncilId: Int, val name: String, val shape: String)