generate a map from list

import scala.util.Random

/**  my use case is:
 *   I have a List[Item];  Item has a field id that is sometimes
 *   not defined == "" ; I want to generate a complete map with id as a key
 *   when defined or else a new key . */
object UpdateKey extends App {
  case class Item(val id: String)
  val list = List(Item("bla"), Item(""))
  val listOfPairs = list.map {
    item =>
      {
        if (item.id != "")
          (item.id, item)
        else
          (Random.nextInt(), item)
      }
  }
  println(Map(listOfPairs: _*))
}