AuthServComponentImpl.scala

trait AuthServComponentImpl extends AuthServComponent {
  self: AuthRepoComponent => // this is the self-type
  val authServ: AuthServ = new AuthServ
  class AuthServImpl extends AuthServ {
    def create(auth: Author) = authRepo.create(auth)
    def retrieve(id: AuthId) = authRepo.retrieve(id)
    def update(auth: Author) = authRepo.update(auth)
    def delete(auth: Author) = authRepo.delete(auth)
  }
}