How retrieve data from firestore in widget? - dart

Question

In my users collection, fields like photoURL,name are stored.
I want to show this fields in my widgets.
Here is my code to get the current user.
Future<void> _getUserDoc() async {
final FirebaseAuth _auth = FirebaseAuth.instance;
final Firestore _firestore = Firestore.instance;
FirebaseUser user = await _auth.currentUser();
setState(() {
userRef = _firestore.collection('users').document(user.uid);
});
}
I don't know how to get data fields.
Here is my Widget for name.
Padding(
padding:
const EdgeInsets.only(left: 20.0, right: 20.0, top: 10.0),
child: Text(
'Richie',
style: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
fontSize: 17.0),
),
),
I want to show instead of Richie in Text widget, user name from firestore.
Thanks in Advance.

Answer 1

You can use FutureBuilder for displaying username, but also you need to get current user so if you aren't getting current user somewhere else you can use nested FutureBuilders
And you can check the current state of that future with connectionState property and show CircularProgressIndicator() while connectionState is waiting ;
Widget DisplayUserName() {
return FutureBuilder(
future: FirebaseAuth.instance.currentUser(),
builder: (BuildContext context, AsyncSnapshot<FirebaseUser> snapshot) {
switch (snapshot.connectionState) {
case ConnectionState.none:
return Text('Press button to start.');
case ConnectionState.active:
case ConnectionState.waiting:
return Text('Awaiting result...');
case ConnectionState.done:
if (snapshot.hasError)
return Text('Error: ${snapshot.error}');
return FutureBuilder(
future: Firestore.instance.collection('users').document(snapshot.data.uid).get(),
builder: (BuildContext context,
AsyncSnapshot<DocumentSnapshot> user) {
switch (user.connectionState) {
case ConnectionState.none:
return Text('Press button to start.');
case ConnectionState.active:
case ConnectionState.waiting:
return CircularProgressIndicator();
case ConnectionState.done:
if (user.hasError)
return Text('Error: ${user.error}');
return Padding(
padding:
const EdgeInsets.only(left: 20.0, right: 20.0, top: 10.0),
child: Text(
user.data['name'],// Im assuming in CloudFirestore your field name is name.
style: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
fontSize: 17.0),
),
);
}
return null; // unreachable
},
);
}
return null; // unreachable
},
);
}
if you have current user in global
Future<FirebaseUser> user;
// you may get it in initState
#override
void initState() {
user = FirebaseAuth.instance.currentUser();
super.initState();
}
This will be enough,
return FutureBuilder(
future: Firestore.instance.collection('users').document(user.uid).get(),
builder: (BuildContext context,
AsyncSnapshot<DocumentSnapshot> user) {
switch (user.connectionState) {
case ConnectionState.none:
return Text('Press button to start.');
case ConnectionState.active:
case ConnectionState.waiting:
return Text('Awaiting result...');
case ConnectionState.done:
if (user.hasError)
return Text('Error: ${user.error}');
return Padding(
padding:
const EdgeInsets.only(left: 20.0, right: 20.0, top: 10.0),
child: Text(
user.data['name'],
style: TextStyle(
fontFamily: 'Montserrat',
fontWeight: FontWeight.bold,
fontSize: 17.0),
),
);
}
return null; // unreachable
},
);