Flutter 从 Firestore 检索文档数据

您好，
您的代码中的错误是您没有get()在DocumentReference. [Firebase Docs Reference]所以，下面是适合你的工作代码

DocumentSnapshot userDetail = await Firestore.instance.collection('users').doc(user.uid).get();
var name = userDetail.data()['name'];
var email = userDetail.data()['email'];

要么

var userDetail;
Firestore.instance.collection('users').doc(user.uid).get().then((DocumentSnapshot doc) {
   userDetail = doc;
   var name = userDetail.data()['name'];
   var email = userDetail.data()['email'];
});