code: func QueryAttemptsForQuest(c context.Context, qid string) *ds.Query {
  	from := ds.MakeKey(c, "Attempt", qid+"|")
  	to := ds.MakeKey(c, "Attempt", qid+"~")
  	return ds.NewQuery("Attempt").Gt("__key__", from).Lt("__key__", to)
  }
docs: // QueryAttemptsForQuest returns all Attempt objects that exist for this Quest.