Flutter / Firestore -如何获取等于currentuser的子集合userid中的集合

import 'package:firebase_core/firebase_core.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

import 'package:firebase_auth/firebase_auth.dart';

void login() async {
  try {
    UserCredential userCredential = await FirebaseAuth.instance.signInWithEmailAndPassword(
      email: 'user@example.com',
      password: 'password',
    );
    User user = userCredential.user;
    // 登录成功后可以获取到当前用户的信息
  } catch (e) {
    // 处理登录失败的情况
  }
}

import 'package:cloud_firestore/cloud_firestore.dart';

void getData() async {
  QuerySnapshot querySnapshot = await FirebaseFirestore.instance
      .collection('users')
      .where('userid', isEqualTo: FirebaseAuth.instance.currentUser.uid)
      .get();
  List<QueryDocumentSnapshot> documents = querySnapshot.docs;
  // 获取到的数据存储在documents中，可以根据需要进行处理
}