How to query data from Firebase with an async call to uid - firebase

Question

I'm trying to fetch data that belong to the logged in user, however, the "getuserui" is async, for some reason. even though the user is logged in to do stuff inside the app the function still returns a Future....
I've lost count to how many different things i've tried, including .then and such but here's my latest attempt.
#override
Widget build(BuildContext context) {
return SizedBox(
height: 900,
child: StreamBuilder(
stream: () async{
fireFirestore.instance.collection('properties').where('uid', isEqualTo: await _authService.getUserId()) .snapshots(),
},
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (!snapshot.hasData)
return const Text('Loading...');
else {
return ListView.builder( ...............
in case you need to see the getUserId():
Future<String> getUserId() {
return _auth.currentUser().then((value) => value.uid.toString());
}
(i've done this method in both the future way (.then) and the async way (async await)
it just tells me the argument type Future<null> can't be assigned to the parameter type Stream

Answer 1

First, you're passing an async function as a stream, hence your error. Second, you need to wrap your StreamBuilder in a FutureBuilder since it depends on the future _authService.getUserId().
#override
Widget build(BuildContext context) {
return SizedBox(
height: 900,
child: FutureBuilder(
future: _authService.getUserId(),
builder: (context, snapshot) {
if(snapshot.hasData)
return StreamBuilder(
stream: fireFirestore.instance.collection('properties').where('uid', isEqualTo: snapshot.data) .snapshots(),
builder: (context, snapshot) {
...
},
);
return Text('future had no data');
},
),
);
}