Validation API

Test.scala

package test

import play.api.data.mapping._

object Test {

  sealed trait Toto
  case object toto1 extends Toto
  case object toto2 extends Toto

  case class Hey(first: String, toto: Toto)

  implicit val totoR = Rule.fromMapping[String, Toto] { str =>
    Success(toto1)
  }

  def defaultR[T](default: T) = Rule.fromMapping[Option[T], T] { o =>
    Success(o.getOrElse(default))
  }

  object Form {
    import play.api.data.mapping.forms.{Rules, UrlFormEncoded}
    import Rules._

    implicit val parsingRule = From[UrlFormEncoded] { __ =>
      ( (__ \ "first").read[String] ~
        (__ \ "toto").read[Toto]
      )(Hey.apply _)
    }
  }

  object Json {
    import play.api.data.mapping.json.Rules
    import play.api.data.mapping.json._
    import play.api.libs.json._
    import Rules._

    implicit val parsingRule = From[JsValue] { __ =>
      ( (__ \ "first").read[String] ~
        (__ \ "toto").read(totoR)
      )(Hey.apply _)
    }
  }

}