Json mapper with enum

user.scala

object Availability extends Enumeration {
  val Free = Value("free")
  val Busy = Value("busy")
  val OOF = Value("oof")

  val options = values.map(a => (a.toString -> a.toString.capitalize))(collection.breakOut)
}

case class User(
  @Key("_id") id: ObjectId = new ObjectId,
  guid: String,
  name: String,
  email: String,
  phone: Option[String],
  mobile: Option[String],
  title: Option[String],
  status: Availability.Value = Availability.Free,
  returnTime: String,
  office: String
){
  override def toString = guid + " - " + email
}

/*
   Converts from json object to User
  */
  implicit object UserFormat extends Format[User] {
    def reads(json: JsValue): User = new User(
      new ObjectId,
      (json \ "guid").as[String],
      (json \ "name").as[String],
      (json \ "email").as[String].toLowerCase,
      (json \ "phone").asOpt[String],
      (json \ "mobile").asOpt[String],
      (json \ "title").asOpt[String],
      (json \ "status").as[Availability],
      (json \ "returnTime").as[String],
      (json \ "office").as[String].toLowerCase
    )
    def writes(u: User): JsValue = JsObject(Seq(
      "name" -> JsString(u.name),
      "email" -> JsString(u.email)
    ))
  }