How to retrieve current user information from Firestore in flutter - firebase

Question

This below code will retrieve all the information from the collection but i want to retrieve only the current user information. How can i do that?
class Booking extends State<BookingDetails> {
final databaseReference = Firestore.instance;
var firebaseUser = FirebaseAuth.instance.currentUser();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Appbar"),
),
body: Center(
child: Container(
padding: const EdgeInsets.all(10.0),
child: StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('User1').snapshots(),
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError)
return new Text('Error: ${snapshot.error}');
switch (snapshot.connectionState) {
case ConnectionState.waiting:
return new Text('Loading...');
default:
return new ListView(
children: snapshot.data.documents
.map((DocumentSnapshot document) {
return new CustomCard(
title: document['name'],
description: document['phno'],
);
}).toList(),
);
}
},
)),
),
);
}
}
I want to store multiple documents for a user and i want to retrieve and show only his documents from Firestore how to do that?

Answer 1

If you want to retrieve information of the current user, then in that case you have to retrieve one document. Example if you have the following structure:
User1 (collection) --> userID (document)
Then you need to do the following:
Stream<DocumentSnapshot> getData()async*{
FirebaseUser user = await FirebaseAuth.instance.currentUser();
yield* Firestore.instance.collection('User1').where("userId", isEqualTo: user.uid).snapshots();
}
Then you can do:
body: Center(
child: Container(
padding: const EdgeInsets.all(10.0),
child: StreamBuilder<QuerySnapshot>(
stream: getData(),