scala の play で routes にcase object 使う

enumよりcase classの方が良さそうだったので。

バージョンとか

scalaVersion := "2.11.2"
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.7")

コード

conf/routes

GET  /foo        controllers.Hoge.foo(device: controllers.Device)

controllers/Hoge.scala

implicit定義

sealed abstract class Device {
  val name = this.toString.toLowerCase
}
object Device {
  case object Android extends Device
  case object iOS extends Device

  implicit def queryStringBinder = new QueryStringBindable[Device] {
    override def bind(key: String, params: Map[String, Seq[String]]): Option[Either[String, Device]] = {
      params(key).headOption map { deviceString =>
        deviceString.toLowerCase match {
          case Android.name => Right(Android)
          case iOS.name => Right(iOS)
          case _ => Left("Unable to bind a Device")
        }
      }
    }
    override def unbind(key: String, device: Device): String = {
      device.name
    }
  }
}

actionのとこ

object Hoge extends Controller {
  def foo(device: Device) = Action { request =>
    println(device, device.getClass)
    device match {
      case Device.Android => println("ぐーぐる")
      case Device.iOS => println("林檎")
    }
    Ok("OK")
  }
}

挙動

200 おｋ
- curl -s -v "localhost:4080/foo?device=android"
- curl -s -v "localhost:4080/foo?device=ios"
400 Bad Request
- curl -s -v "localhost:4080/foo?device=andrd"
- curl -s -v "localhost:4080/foo?device=firefox"
500 Internal Server Error
- curl -s -v "localhost:4080/foo?devie=ios"

参考にしたとこ

主にこのへん。