J'ai réussi à le faire fonctionner, voici mon trait générique :
import scala.slick.driver.PostgresDriver
import scala.slick.driver.PostgresDriver.simple._
import path.to.RichTable
trait PostgresGeneric[T <: RichTable[A], A] {
val tableReference: TableQuery[T]
def insert(row: T#TableElementType)(implicit s: Session) =
tableReference.insert(row)
def insertAndGetId(row: T#TableElementType)(implicit s: Session) =
(tableReference returning tableReference.map(_.id)) += row
def deleteById(id: Long)(implicit s: Session): Boolean =
tableReference.filter(_.id === id).delete == 1
def updateById(id: Long, row: T#TableElementType)(implicit s: Session): Boolean =
tableReference.filter(_.id === id).update(row) == 1
def selectById(id: Long)(implicit s: Session): Option[T#TableElementType] =
tableReference.filter(_.id === id).firstOption
def existsById(id: Long)(implicit s: Session): Boolean = {
(for {
row <- tableReference
if row.id === id
} yield row).firstOption.isDefined
}
}
Où RichTable
est une classe abstraite avec un champ id, ceci, avec la contrainte de limite supérieure est utile pour obtenir le champ id de T#TableElementType
(voir ceci pour plus d'informations):
import scala.slick.driver.PostgresDriver.simple._
import scala.slick.jdbc.{GetResult => GR}
abstract class RichTable[T](tag: Tag, name: String) extends Table[T](tag, name) {
val id: Column[Long] = column[Long]("id", O.PrimaryKey, O.AutoInc)
}
Et mon tableau de campagne ressemble maintenant à ceci :
import scala.slick.driver.PostgresDriver.simple._
import scala.slick.jdbc.{GetResult => GR}
import scala.slick.lifted.TableQuery
case class CampaignRow(id: Long, name: Option[String])
class Campaign(tag: Tag) extends RichTable[CampaignRow](tag, "campaign") {
def * = (id, name) <>(CampaignRow.tupled, CampaignRow.unapply)
def ? = (id.?, name).shaped.<>({
r => import r._; _1.map(_ => CampaignRow.tupled((_1.get, _2)))
}, (_: Any) => throw new Exception("Inserting into ? projection not supported."))
override val id: Column[Long] = column[Long]("id", O.AutoInc, O.PrimaryKey)
val name: Column[Option[String]] = column[Option[String]]("name")
}
Le modèle implémentant le trait générique ressemble à ceci :
object CampaignModel extends PostgresGeneric[Campaign, CampaignRow] {
override val tableReference: PostgresDriver.simple.TableQuery[Tables.Campaign] =
TableQuery[Campaign]
def insertCampaign(row: CampaignRow) = {
insert(CampaignRow(0, "test"))
}
}