Domain.scala

import io.scalac.inventory.db.{Office, CanonicalForm}
import net.fwbrasil.activate.entity.Entity

object Domain {
  ....
  sealed case class Item(val name: String, val code: Long, var office: Office)
  class ItemEntity(val name: String, val code: Long, var inOffice: OfficeEntity) extends Entity {
    ...
    def codeMustBeUnique = unique(_.code)
  }
  ....
}