javascript - 给定一组uid，如何在React Native中返回Firebase数据的JavaScript对象？(How can I return a JavaScript object of Firebase data in React Native, given an array of uids?)

Question

I have an area of my code where users of a group are stored in an array.(我在代码区域中将组的用户存储在数组中。)

In some cases, I want to gather additional data on the users.(在某些情况下，我想收集有关用户的其他数据。) Here is what I tried so far:(这是我到目前为止尝试过的：) async getMembersData(groupUid) { const members = await this.getMembers(groupUid); var membersData = {}; Object.keys(members).map((key, i) => { const member = members[key]; firebase.database().ref(`users/${member.uid}`).once('value', snap => { membersData[member.uid] = { 'uid': member.uid, 'username': snap.child('username').val(), 'imageUrl': snap.child('imageUrl').val(), 'type': member.type, }; }); }); return membersData; } I have this code working similarly by setting state and using the firebase .on() function, but I need it to work with .once() and returning the object.(我可以通过设置状态并使用firebase .on（）函数来使此代码类似地工作，但是我需要它与.once（）一起工作并返回对象。)   ask by Robert Berge translate from so

Answer 1

What about:(关于什么：)

async getMembersData(groupUid) { const members = await this.getMembers(groupUid); var membersData = {}; Object.keys(members).map((key, i) => { const member = members[key]; const snap = await firebase.database().ref(`users/${member.uid}`).once('value'); membersData[member.uid] = { 'uid': member.uid, 'username': snap.child('username').val(), 'imageUrl': snap.child('imageUrl').val(), 'type': member.type, }; }); }); return membersData; } Since the once() method returns a Promise with a DataSnapshot .(由于once()方法返回带有DataSnapshot的Promise。)