better.scala

  case class SomeModel(field1: String, field2: String)
  
  def index = Action(parse.json) { implicit request =>
    val validation = for {
      field1 <- js[String]("field1")
      field2 <- js[String]("field2")
    } yield (field1 |@| field2)(SomeModel.apply)
    
    validation(request.body).fold(
      e => BadRequest(Json.toJson(Map("errors" -> Json.toJson(e.toList)))),
      s => Ok(Json.toJson(Map("field1" -> s.field1, "field2" -> s.field2)))
    )		 
  }
  
  def js[A:Reads](field: String): JsValue => ValidationNEL[String, A] = j => (j \ field).asOpt[A] toSuccess ("Field '%s' not found" format field).point[NonEmptyList]