trait StorageService extends unfiltered.filter.Plan {
  implicit val formats = DefaultFormats
  val identityFunction = SimpleFunction.nullary[Int]("identity")

  override def intent = {
    ...
    case req @ PUT(Path(Seg("rest" :: "products" :: Nil))) =>
      ResponseString(
        write(ProductDb.database withSession {
          session: Session =>
            implicit val s = session
            Products insertValue(read[Product](Body.string(req)))
            Query(Products).where(_.id === Query(identityFunction).first).list.head
        })
      )
    ...
  }
}