gistfile1.scala

  // finds all documents with lastName = Godbillon and replace lastName with GODBILLON
  def findAndModify() = {
    val selector = BSONDocument(
      "lastName" -> BSONString("Godbillon"))

    val modifier = BSONDocument(
      "$set" -> BSONDocument("lastName" -> BSONString("GODBILLON")))

    val command = FindAndModify(
      collection.collectionName,
      selector,
      Update(modifier, false))

    db.command(command).onComplete {
      case Left(error) => {
        throw new RuntimeException("got an error while performing findAndModify", error)
      }
      case Right(maybeDocument) => println("findAndModify successfully done with original document = " +
        // if there is an original document returned, print it in a pretty format
        maybeDocument.map(doc => {
          // get a BSONIterator (lazy BSON parser) of this document
          // stringify it with DefaultBSONIterator.pretty
          DefaultBSONIterator.pretty(doc.bsonIterator)
        })
      )
    }
  }