更新Flutter Firebase Firestore数据库中的嵌套数据

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firestore Update Example',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Firestore Update Example'),
        ),
        body: Center(
          child: ElevatedButton(
            child: Text('Update Nested Data'),
            onPressed: () {
              updateNestedData();
            },
          ),
        ),
      ),
    );
  }

  void updateNestedData() {
    FirebaseFirestore.instance
        .collection('collectionName')
        .doc('documentId')
        .update({'nestedField.fieldName': 'updatedValue'})
        .then((value) {
      print('Nested data updated successfully!');
    }).catchError((error) {
      print('Failed to update nested data: $error');
    });
  }
}