我目前有一个收藏|文件|集合Firestore。我想在文档中搜索一个特定的集合，如果用户ID匹配，则更新。如果用户ID不在集合中，则我想添加一个新集合。
集合更新方面工作正常，但是在通过.set（）添加到集合时得到Promise Rejection。

if (!query.empty) {
      console.log('event leaderboard exists in db');
      for (let i in leaderboard) {
        const result = leaderboard[i].data();

        for (let y in result) {
          const userLeaderboard = result[y];
          
          if (userLeaderboard.uid === currentUser.uid) {
            // User exists in record and update score
            return query.docs[i].ref.update({
              score: increaseBy,
            });
          } else {
            // User does not exist and need to add to record
            addUserToLeaderboard();
            
          }
        }
      }

...

const addUserToLeaderboard = async() => {
let userLeaderboard = {
  uid: currentUser.uid,
  score: currentTrivia.points,
  banned: false,
};

const leaderboardRef = db.collection('leaderboard').where(firebase.firestore.FieldPath.documentId(), '==', eventId);
await leaderboardRef.set(userLeaderboard, { merge: true });

}