Binder.scala

case class HotelQS(hotelId: Option[Long] = None,
                   country: Option[String] = None,
                   city: Option[String] = None,
                   zipcode: Option[String] = None)

object HotelQS {
  implicit val hotelMapping: Mapping[HotelQS] =
    mapping(
      "hotelId" -> optional(longNumber),
      "country" -> optional(text),
      "city" -> optional(text),
      "zipcode" -> optional(text)
    )(HotelQS.apply)(HotelQS.unapply)

}

controller.scala

def list(filter : HotelQS, page: Int =0, orderBy: Int=0) = Action {
    implicit request =>
      val hotels = models.Hotels.findPage(page, orderBy, filter)
      render {
        case Accepts.Html() => Ok(views.html.it.hotels.list("List hotels", hotels, orderBy, filter))
        case Accepts.Json() => Ok(Json.toJson(hotels))
      }
  }

route

GET         /hotels                           controllers.Hotels.list(q:binders.HotelQS?=new binders.HotelQS, p:Int ?= 0,s:Int ?= 1)