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

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