reactive mongo using gridfs to list files

gistfile1.scala

  import reactivemongo.api.gridfs.Implicits._
  
  def listFiles(docId: String) = Action {
		Async {
			listOfFiles(docId).map (files => Ok(files))
		}
	}
	
	def listOfFiles(docId: String) = {
		val files = gridFS.find(BSONDocument("document" -> new BSONObjectID(docId)))
			
		files.toList.map { files =>
			val filesId = files map (file => bsonToString(file.id))
				
			Json.toJson(Map("files" ->filesId))
		}
	}