The operator '[]' isn't defined for the type 'Object'. Try defining the operator '[]' как исправить?

Question

[basliney]

Привет всем. Подскажите кому не сложно. нашел на ютубе видео туториал по подключению Firebase к приложению на Flutter. Повторил код один в один, но получаю ошибку

The operator '[]' isn't defined for the type 'Object'.
Try defining the operator '[]'

Я так понимаю, что все наследуется от Object отсюда и косяк. Но в видеоролике все успешно запустилось. https://www.youtube.com/watch?v=LnpGU8vj7TI

Подскажите как исправить?

Код:

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'asdasd',
      theme: ThemeData(
          primaryColor: Colors.blue,
          visualDensity: VisualDensity.adaptivePlatformDensity),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Firebase'),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () => FirebaseFirestore.instance
              .collection('testing')
              .add({'timestamp': Timestamp.fromDate(DateTime.now())}),
          child: Icon(Icons.add),
        ),
        body: StreamBuilder(
          stream: FirebaseFirestore.instance.collection('testing').snapshots(),
          builder:
              (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
            if (!snapshot.hasData) return const SizedBox.shrink();
            return ListView.builder(
                itemCount: snapshot.data.docs.length,
                itemBuilder: (BuildContext context, int index) {
                  final docData = snapshot.data.docs[index].data();
                  final dateTime = (docData['timestamp'] as Timestamp).toDate();
                  return ListTile(
                    title: Text(dateTime.toString()),
                  );
                });
          },
        ),
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Ругается на final dateTime = (docData['timestamp'] as Timestamp).toDate();

Answer 1

[SaberHardy]

Не знаю, решили ли вы проблему или нет, но я думаю, может быть, это будет полезно для кого-то другого:
здесь ( final docData = snapshot.data!.docs[index].data(); )
вам проста нужен удалить ( .data() ) и все,
Удаче
Sorry, for my Russsian Language.

For English debbugers:
just you need to delete:
.data() from your index.
and this is since dart 2.0
thats all
good luck for all of you.

Comments

[basliney]

Yes, that's how I solved this problem, but then, to use docData, I still need to do some more manipulations (I don't remember which ones). Thanks for the answer. Your Russian is pretty good. :)