java script google-cloud-function 中的每个函数如何使用？

Question

使用此代码

 import * as functions from "firebase-functions";
import admin from "firebase-admin";
import { addFeed } from "../../../utils/feeds";

export default functions.firestore
  .document("meinprofilsettings/{userUid}/following/{followingUid}")
  .onCreate(async (snap, context) => {
    const db = admin.firestore();
    const { userUid, followingUid } = context.params;
    const userSnap = await db.doc(`meinprofilsettings/${userUid}`).get();
    const { username = "Userdoesnotexists" } = userSnap.exists
      ? userSnap.data()
      : 7;


      //code for the each
      const uservideos= await db.collection("videos").where(“uid”, “==“, followingUid).get().then(function(video){
        await db
        .doc(`meinprofilsettings/${followingUid}/followingvideos/${userUid}`)
        .set({ uid: userUid ,videourl:video.data.videourl}, { merge: true });
      }),



    const incrementFollowing = admin.firestore.FieldValue.increment(1);

    return db
      .doc(`meinprofilsettingscounters/${userUid}`)
      .set({ following: incrementFollowing }, { merge: true });
  });

我试图从集合中获取来自特定用户的每个视频。然后我想在另一个集合中设置视频的每个 id 和视频 url，但我正在努力处理代码。

所以这部分

  const uservideos= await db.collection("videos").where(“uid”, “==“, followingUid).get()

我正在获取每个视频。我确定这是正确的，但现在如何设置另一个集合中的每个视频

像这样

.then(function(video){
        await db
        .doc(`meinprofilsettings/${followingUid}/followingvideos/${userUid}`)
        .set({ uid: userUid ,videourl:video.data.videourl}, { merge: true });
      }),

在这部分我很纠结，不确定到底该做什么以及它是否正确。所以请希望有人能告诉我我们是否可以使用“.then”。如果是这样，我如何运行然后是 foreach 以及如何获取视频 url 或名称等数据。如果不行，请告诉我怎么做。

Answer 1

因为你想执行 未确定数量 对异步 set() 方法的调用 parallel，你可以这样使用Promise.all()：

export default functions.firestore
  .document("meinprofilsettings/{userUid}/following/{followingUid}")
  .onCreate(async (snap, context) => {
      
    const db = admin.firestore();
    const { userUid, followingUid } = context.params;
    const userSnap = await db.doc(`meinprofilsettings/${userUid}`).get();
    
    const { username = "Userdoesnotexists" } = userSnap.exists
      ? userSnap.data()
      : 7;

    const videosQuerySnapshot = await db.collection("videos").where(“uid”, “==“, followingUid).get();
    
    const promises = [];
    
    videosQuerySnapshot.forEach(videoDocSnapshot => {
        
        promises.push(db
            .doc(`meinprofilsettings/${followingUid}/followingvideos/${userUid}`)
            .set({ uid: userUid, videourl: videoDocSnapshot.get('videourl') }, { merge: true })
        )
        
    })
    
    await Promise.all(promises);

    const incrementFollowing = admin.firestore.FieldValue.increment(1);

    return db
      .doc(`meinprofilsettingscounters/${userUid}`)
      .set({ following: incrementFollowing }, { merge: true });
  });

java script google-cloud-function 中的每个函数如何使用？

How the use for each in java script google-cloud-function?

javascript

firebase

google-cloud-functions

google-cloud-firestore