Firebase身份验证错误:未定义名称"auth" [英] Firebase authentication error: Undefined name 'auth'

问题描述

我想通过使用每个用户的UID来访问我的firestore数据库，例如:

I would like to acces my firestore databse, by using the UID of each user, like so:

return new StreamBuilder(
    stream: Firestore.instance.collection('users').document(uid).snapshots(),
    builder: (context, snapshot) {
      if (!snapshot.hasData) {
        return new Text("Loading");
      }
      var userDocument = snapshot.data;

并获取UID:

final FirebaseUser user = auth.currentUser().then((FirebaseUser user) {
  final userid = user.uid;
});

这但我不断收到错误消息

This but I keep getting the error

Undefined name 'auth'.

推荐答案

要在Flutter中使用 FirebaseAuth ，您必须获得对此实例的引用.每当需要使用Firebase身份验证时，将此行添加到小部件/文件的顶部:

To use FirebaseAuth in flutter, you must get a reference to such instance. Add this line at the top of your widget/file whenever you need to use Firebase Authentication:

import 'package:firebase_auth/firebase_auth.dart';

FirebaseAuth auth = FirebaseAuth.instance;

现在，您可以像正确执行操作一样使用 auth.currentUser().then(...)之类的东西.

Now you can use stuff like auth.currentUser().then(...) like you are doing correctly.

这篇关于Firebase身份验证错误:未定义名称"auth"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！