Can't retrieve a number of document into firestore flutter - flutter

Question

I have a small problem, I need to retrieve into my list a collection retrieved by StreamBuilder from Firestore.
I am using snapshot.data.documents.lenght but once I add it I got error:
Class 'DocumentSnapshot' has no instance getter 'documents'.
Receiver: Instance of 'DocumentSnapshot'
Tried calling: documents
this is my code:
Stream<DocumentSnapshot> getDatabase() async* {
FirebaseUser user = await FirebaseAuth.instance.currentUser();
yield* Firestore.instance
.collection('dataCollection')
.document(user.uid)
.snapshots();
}
#override
Widget build(BuildContext context,) {
return StreamBuilder(
stream: getDatabase(),
builder: (context, snapshot,) {
if (snapshot.data != null) {
return Column(
children: <Widget>[
Container(
height: 500,
child: ListView.builder(
shrinkWrap: true,
itemCount: 2,
itemBuilder: (BuildContext context, int index) {
return Card(
color: Color(0xFF1f2032),
elevation: 15,
child: Text(
snapshot.data['phone']..

Answer 1

just change your code as following
Stream dataStream
then
#override
void initState() {
getDatabase().then((value) {
dataStream = value;
setState(() {});
});
super.initState();
}
the funcion getDatbase()
getDatabase() async {
FirebaseUser user = await FirebaseAuth.instance.currentUser();
yield* Firestore.instance
.collection('dataCollection')
.document(user.uid)
.snapshots();
}
then
#override
Widget build(BuildContext context,) {
return StreamBuilder(
stream: dataStream,
builder: (context, snapshot,) {
if (snapshot.data != null) {
return Column(
children: <Widget>[
Container(
height: 500,
child: ListView.builder(
shrinkWrap: true,
itemCount: 2,
itemBuilder: (BuildContext context, int index) {
return Card(
color: Color(0xFF1f2032),
elevation: 15,
child: Text(
snapshot.data['phone']..

Answer 2

Try this,
StreamBuilder(
stream: stream,
builder: (BuildContext context,
AsyncSnapshot<List<DocumentSnapshot>> snapshots) {
if (snapshots.connectionState == ConnectionState.active &&
snapshots.hasData) {
return Expanded(
child: ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: snapshots.data.length,
itemBuilder: (BuildContext context, int index) {
//do something with snapshot.
}
}
return Container();
},
),
);
} else {
return Container();
}
},
),
Initialise your stream like this,
Stream<DocumentSnapshot> stream;
Future<dynamic> getDatabase() async {
FirebaseUser user = await FirebaseAuth.instance.currentUser();
setState(() {
stream=Firestore.instance
.collection('dataCollection')
.document(user.uid)
.snapshots();
});
}
You can call getDatabase() in initState.
Update:-
This is your full code.
class DataCo extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: Colors.blue,
),
body: Column(
children: [
CollectData(),
],
),
);
}
}
class CollectData extends StatefulWidget {
#override
_CollectDataState createState() => _CollectDataState();
}
class _CollectDataState extends State<CollectData> {
final String phone;
final String wife;
final String location;
_CollectDataState({this.phone, this.wife, this.location});
#override
void initState() {
super.initState();
getDatabase();
}
Stream<DocumentSnapshot> stream;
Future<dynamic> getDatabase() async {
FirebaseUser user = await FirebaseAuth.instance.currentUser();
setState(() {
stream=Firestore.instance
.collection('dataCollection')
.document(user.uid)
.snapshots();
});
}
#override
Widget build(BuildContext context,) {
return StreamBuilder(
stream: stream,
builder: (BuildContext context,
AsyncSnapshot<DocumentSnapshot> snapshots) {
if (snapshots.connectionState == ConnectionState.active &&
snapshots.hasData) {
return Expanded(
child: ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: snapshots.data.length,
itemBuilder: (BuildContext context, int index) {
//do something with snapshot.
}
}
return Container();
},
),
);
} else {
return Container();
}
},
);
}
}
class NoData extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Column(
children: [
Text('No Data available'),
],
);
}
}