How to save entities and relatives

I have a trip, and I have legs of that trip. How do I save the two entities while preserving the relationship between the two entities. I have read the documentation several times and either it does a poor job of explaining it or it doesn’t explain it at all.

Here is what I have: table/Trips.kt

object Trips : IntIdTable("trip") {
    val driver_id = integer("driver_id")
    val truckload_id = integer("truckload_id")

    val insertedAt = datetime("inserted_at")
    val updatedAt = datetime("updated_at")
}

entity/Trip.kt

class Trip(id: EntityID<Int>) : IntEntity(id) {
    companion object : IntEntityClass<Trip>(Trips)

    var driver_id by Trips.driver_id
    var truckload_id by Trips.truckload_id
    var insertedAt by Trips.insertedAt
    var updatedAt by Trips.updatedAt

    val tripLegs by TripLeg referrersOn TripLegs.trip
}

table/TripLegs.kt

object TripLegs : IntIdTable("trip_leg") {
    val trip = reference("id", Trips)
    val ordinal = integer("ordinal")
    val phase = varchar("phase", 255)
    val status = varchar("status", 255)
    val source_location = reference("source_location_id", Locations).nullable()
    val destination_location = reference("destination_location_id", Locations).nullable()

    val insertedAt = datetime("inserted_at")
    val updatedAt = datetime("updated_at")
}

entity/TripLeg.kt

class TripLeg(id: EntityID<Int>) : IntEntity(id) {
    companion object : IntEntityClass<TripLeg>(TripLegs)

    var trip by Trip referencedOn TripLegs.trip

    var ordinal by TripLegs.ordinal
    var phase by TripLegs.phase
    var status by TripLegs.status
    var source_location by TripLegs.source_location
    var destination_location by TripLegs.destination_location

    var completions by Duration via TripLegsCompletions
    var remainings by Duration via TripLegsRemainings
}

---

Here is the code I’ve attempted to use and it doesn’t work because entity.Trip.tripLegs is a val, changing it to a var causes the referrersOn to no longer work

At the risk of giving too much info. The value trip here is of an intermediate type that is not in the data project. .entity.* and .table.* are in it’s own package, separate from the intermediate values.

            entity.Trip.new {
                driver_id = trip.driver.id
                truckload_id = trip.truckload.id
                tripLegs = SizedCollection(trip.legs.map {
                    entity.TripLeg.new {
                        ordinal = it.order
                        phase = it.phase.toString()
                        status = it.status.toString()
                        //source_location = it.source
                        //destination_location = it.destination
                    }
                })
            }

[Oxymoron290]

A better working example is

val result = entity.Trip.new {
    driver_id = t.driver.id
    truckload_id = t.truckload.id
}.also { newTrip ->
    t.legs.forEach {
        entity.TripLeg.new {
            trip = newTrip
            ordinal = it.order
            phase = it.phase.toString()
            status = it.status.toString()
        }
    }
}

[Tapac]

Yep, documentation is very poor and we are going to improve it in the near future.

Answering your question just set TripLeg .tripLegs value with created trip instance.

            val trip = entity.Trip.new {
                driver_id = trip.driver.id
                truckload_id = trip.truckload.id
           }.also { newTrip ->
                trip.legs.forEach {
                    entity.TripLeg.new {
                        trip = newTrip
                        ordinal = it.order
                        phase = it.phase.toString()
                        status = it.status.toString()
                }
            }