云函数如何嵌套Promise

我需要做出一些承诺。

我首先需要使用以下命令来递增ref: .set(admin.database.ServerValue.increment(1))

一旦完成,我需要在不同的参考处更新一些数据: return admin.database().ref('/user_credits/' + creditId + '/' + userId).set({ "joined_date": receivedTimeStamp, "timeStamp": receivedTimeStamp, "credits_count": 1 })

以下代码正常工作,两个引用都按预期更新,但我收到了以下警告:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.updateViewsCtAtPostsRef = functions.https.onRequest((request, response) => {

    const currentTimeStamp = Date.now();
    const receivedTimeStamp = admin.database.ServerValue.TIMESTAMP;

    const creditId = "sample_123";
    const userId = "userId_xyz";
    const gameId = "game_abc";
    admin.database().ref('user_credits').child(creditId).child(userId).once('value', snapshot => {

        if (!snapshot.exists()) {

            admin.database().ref('/games/' + gameId + '/' + 'score').set(admin.database.ServerValue.increment(1))
            .then(() => { 

                return admin.database().ref('/user_credits/' + creditId + '/' + userId).set({ "joined_date": receivedTimeStamp, "timeStamp": receivedTimeStamp, "credits_count": 1 })
                .then(() => { 
                    return true; 
                })
                .catch(error);
            })
            .catch(error);

        } else {

            const previousTimeStamp = snapshot.child("timeStamp").val();
            const creditsCount = snapshot.child("credits_count").val();

            if (previousTimeStamp + whatever) < currentTimeStamp {

                let updatedCount = creditsCount + 1;

                admin.database().ref('/games/' + gameId + '/' + 'score').set(admin.database.ServerValue.increment(1))
                .then(() => {

                    return admin.database().ref('/user_credits/' + creditId + '/' + userId).update({ "timeStamp": receivedTimeStamp, "credits_count": updatedCount })
                    .then(() => { 
                        return true; 
                    })
                    .catch(error);
                })
                .catch(error);

            } else {

               return true
            }
        }
    });
});