SLICK How to define bidirectional one-to-many relationship for use in case class

Question

I am using SLICK 1.0.0-RC2. I have defined the following two tables Directorate and ServiceArea where Directorate has a one to many relationship with ServiceArea

Answer 1

I'm sure there is a more elegant solution, but this should do the trick:

import scala.slick.driver.H2Driver.simple._
import Database.threadLocalSession

object SlickExperiments2 {

  Database.forURL("jdbc:h2:mem:test1", driver = "org.h2.Driver") withSession {

    (Directorates.ddl ++ ServiceAreas.ddl).create

    case class Directorate(dirCode: String, name: String) {
      def serviceAreas: Seq[ServiceArea] = (for {
        a <- ServiceAreas
        if (a.dirCode === dirCode)
      } yield (a)).list
    }

    object Directorates extends Table[Directorate]("DIRECTORATES") {

      def dirCode = column[String]("DIRECTORATE_CODE", O.PrimaryKey)

      def name = column[String]("NAME")

      def * = dirCode ~ name <> (Directorate, Directorate.unapply _)
    }

    case class ServiceArea(areaCode: String, dirCode: String, name: String)

    object ServiceAreas extends Table[ServiceArea]("SERVICE_AREAS") {

      def areaCode = column[String]("AREAE_CODE", O.PrimaryKey)

      def dirCode = column[String]("DIRECTORATE_CODE")

      def name = column[String]("NAME")

      def directorate = foreignKey("DIR_FK", dirCode, Directorates)(_.dirCode)

      def * = areaCode ~ dirCode ~ name <> (ServiceArea, ServiceArea.unapply _)
    }

    Directorates.insert(Directorate("Dircode", "Dirname"))

    ServiceAreas.insertAll(ServiceArea("a", "Dircode", "A"), ServiceArea("b", "Dircode", "B"))

    val sa = (for{
    d <- Directorates
    } yield d).list map { case t: Directorate => t.serviceAreas}

    println(sa)
  }                                              
 //> List(List(ServiceArea(a,Dircode,A), ServiceArea(b,Dircode,B)))
}