Question

我似乎无法弄清楚我哪里出错了，我尝试将代码放在异步函数中并等待循环完成，但它以某种方式在完成之前一直提交 writebatch。

请有人解释一下我的代码，我不知道我可能在哪里不理解这个过程。

我设法研究的是异步函数在后台运行并允许其他代码运行，因此如果我需要在之后完成工作，我需要先等待异步操作。

请让我知道我缺少什么，感谢您的帮助，这是我的代码：

getReady();

async function stage1() {

    const batch = db.batch();


    await response.data.matches.forEach(async match => {


        var batchRef = db.collection('matches').doc(`${match.id}`);

        var utcDate = `${match.utcDate}`; // ISO-8601 formatted date returned from server


        var localDate = moment.utc(utcDate).toDate();

        var unixTime = ((localDate.getTime()) / 1000);

        const now = new Date();
        const secondsSinceEpoch = Math.round(now.getTime() / 1000)

        var howLong = timeDifference(unixTime, secondsSinceEpoch);


        var checkMatches = db.collection('matches');
        matchesSnapshot = await checkMatches.where('matchId', '==',
            match.id).get();


        if (matchesSnapshot.empty) {


            batch.set(batchRef, {
                competitionName: `${match.competition.name}`,
                competitionId: `${match.competition.id}`,
                matchStatus: `${match.status}`,
                matchDate: `${match.utcDate}`,
                matchDay: `${match.matchday}`,

                unixDate: unixTime,
                matchId: `${match.id}`,



                lastUpdated: `${match.lastUpdated}`,
                homeTeamScore: match.score.fullTime.homeTeam,
                awayTeamScore: match.score.fullTime.awayTeam,

                homeWinOdds: `${match.odds.homeWin}`,
                drawOdds: `${match.odds.draw}`,
                awayWinOdds: `${match.odds.awayWin}`,
                matchResults: `${match.score.winner}`,
                matchduration: `${match.score.duration}`,
                fullTimeHomeTeam: `${match.score.fullTime.homeTeam}`,
                fullTimeAwayTeam: `${match.score.fullTime.awayTeam}`,
                halfTimeHomeTeam: `${match.score.halfTime.homeTeam}`,
                halfTimeAwayTeam: `${match.score.halfTime.awayTeam}`,
                extraTimeHomeTeam: `${match.score.extraTime.homeTeam}`,
                extraTimeAwayTeam: `${match.score.extraTime.awayTeam}`,
                penaltiesHomeTeam: `${match.score.penalties.homeTeam}`,
                penaltiesAwayTeam: `${match.score.penalties.awayTeam}`,
                homeTeamId: `${match.homeTeam.id}`,
                awayTeamId: `${match.awayTeam.id}`,
                homeTeamName: `${match.homeTeam.name}`,
                awayTeamName: `${match.awayTeam.name}`,
                category: 'Football'


            });


        } else if (!matchesSnapshot.empty) {


            var checkingMatches = db.collection('matches').doc(`${match}`);
            var doc = await checkingMatches.get();


            var oldTime = doc.data().lastUpdated;


            var utcDate2 = `${match.lastUpdated}`; // ISO-8601 formatted date returned from server

            var utcDate3 = oldTime; //


            var localDate2 = moment.utc(utcDate2).toDate();
            var localDate3 = moment.utc(utcDate3).toDate();


            var unixTime2 = ((localDate2.getTime()) / 1000);
            var unixTime3 = ((localDate3.getTime()) / 1000);


            if (unixTime2 > unixTime3) {

                const reference = db.collection('matches').doc(`${match.id}`);


                batch.update(reference, {

                    matchStatus: `${match.status}`,
                    matchDate: `${match.utcDate}`,
                    matchDay: `${match.matchday}`,


                    lastUpdated: `${match.lastUpdated}`,
                    homeTeamScore: match.score.fullTime.homeTeam,
                    awayTeamScore: match.score.fullTime.awayTeam,

                    homeWinOdds: `${match.odds.homeWin}`,
                    drawOdds: `${match.odds.draw}`,
                    awayWinOdds: `${match.odds.awayWin}`,
                    matchResults: `${match.score.winner}`,
                    matchduration: `${match.score.duration}`,
                    fullTimeHomeTeam: `${match.score.fullTime.homeTeam}`,
                    fullTimeAwayTeam: `${match.score.fullTime.awayTeam}`,
                    halfTimeHomeTeam: `${match.score.halfTime.homeTeam}`,
                    halfTimeAwayTeam: `${match.score.halfTime.awayTeam}`,
                    extraTimeHomeTeam: `${match.score.extraTime.homeTeam}`,
                    extraTimeAwayTeam: `${match.score.extraTime.awayTeam}`,
                    penaltiesHomeTeam: `${match.score.penalties.homeTeam}`,
                    penaltiesAwayTeam: `${match.score.penalties.awayTeam}`,

                });

            }


        }


    });

    return batch.commit().then(() => {


        console.log("im done");
    }).catch((err) => {
        console.log('Mac! there was an error while doing the job: ', err);
    });


}




async function getReady() {


            await stage1();
 

        }

Answer 1

让我眼前一亮的是你在第 4 行的 .forEach(async match => {。 .forEach() 是 NOT 异步的 - 它会NOT 等待，它将继续进行 - 这可能是在异步操作尝试写入之前关闭 WriteBatch 的原因.

您至少需要使用 Promise.All(...whatever.map()) 之类的东西（如果您愿意，还可以丢弃结果）以使整个事物异步。

说实话，在那之后我什至没有看过任何东西 - 很可能还有其他问题。

无法使用 Firestore 修改已在 Node Js 中提交的 WriteBatch

1 个答案: