Couldnt Read Data From Firetore-CodePudding

I am trying to read data from Firebase Firestore, but I am not able to do so, and I have some Errors. I did it before this way and it worked but now I think the way to read data is changed.

The Error ( The property 'docs' can't be unconditionally accessed because the receiver can be 'null'. Try making the access conditional (using '?.') or adding a null check to the target ('!'). )

adding a null check does not solve the problem. Firestore has no rules to block the data

lass Toyota extends StatefulWidget {
  const Toyota({Key? key}) : super(key: key);

  @override
  State<Toyota> createState() => _ToyotaState();
}

class _ToyotaState extends State<Toyota> {
  final firestore = FirebaseFirestore.instance.collection("toyota").get();

  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
      body: StreamBuilder(
          stream: FirebaseFirestore.instance.collection('singers').snapshots(),
          builder: (context, snapshot) {
            return ListView.builder(
              itemCount: (snapshot.data as QuerySnapshot).docs.length,
              itemBuilder: (context, index) =>  Text(
                           ////// Here is the problem ( The docs )
                            snapshot.data.docs[index]["price"],
                           
                          ),

CodePudding user response：

(snapshot.data! as QuerySnapshot).docs.length

write like this at itemcount instead of it

(snapshot.data as QuerySnapshot).docs.length,

if still any confusion then ask me

CodePudding user response：

You need to put a condition for when your snapshot has data

here is an example:

if (snapshot.hasData) {
          return ListView.builder(
              itemCount: snapshot.data.docs.length,
              itemBuilder: (context, index) {
                return ListTile(
                  title: Text(snapshot.data.docs[index].data()['name']),
                  subtitle: Text(snapshot.data.docs[index].data()['age']),
                );
              });
        } else {
          return Center(
            child: CircularProgressIndicator(),
          );
        }

CodePudding user response：

static final FirebaseFirestore _firestore = FirebaseFirestore.instance;

QuerySnapshot snapshot = await _firestore
        .collection('toyota')
        .get();

Check this out.