Recursive case class extraction in Rapture JSON

recursive.scala

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scala> import rapture.json._
import rapture.json._

scala> import jsonBackends.spray._
import jsonBackends.spray._

scala> val order = json"""{ "name": "Jon Pretty", "items": [{ "name": "Apple", "quantity": 2 }, { "name": "Turnip" }] }"""
order: rapture.json.Json = {"name":"Jon Pretty","items":[{"name":"Apple","quantity":2},{"name":"Turnip"}]}

scala> case class OrderItem(name: String, quantity: Int = 1)
defined class OrderItem

scala> case class Order(name: String, items: Vector[OrderItem])
defined class Order

scala> order.as[Order]
res0: Order = Order(Jon Pretty,Vector(OrderItem(Apple,2), OrderItem(Turnip,1)))