StreamProvider doesn't update list (Firestore) - flutter

Question

I've created collection in Firestore called users and added several documents in it.
In Flutter's main, I've initialised StreamProvider
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
StreamProvider(create: (_) => Firestore.instance.collection('users').snapshots()),
ChangeNotifierProvider<UserStore>(create: (_) => UserStore()),
],
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MainPage(),
),
);
}
and in my Widget, I want to see how many documents (users) i've in my collection
StreamProvider<List<User>>.value(
value: streamUsers(), child: Text("${Provider.of<List<User>>(context).length}")),
My streamUsers method is as follows (mapping documents to list of documents)
Stream<List<User>> streamUsers() {
var ref = Firestore.instance.collection('users');
return ref.snapshots().map((list) => list.documents.map((doc) => User.fromFirestore(doc)).toList());
}
There is an obvious issue, that Provider.of<List<User>>.. cannot be used like this. Also in the StreamProviders initialisation, I believe I miss my model type, but I couldn't understand how can I put there List<User>because it required to be type of QuerySnapshot
StreamProvider<List<User>>(create: (_) => Firestore.instance.collection('users').snapshots())
What do I miss here?

Answer 1

..aand I found the solution.
First, for creating a StreamProvider we do like this
StreamProvider<List<User>>(create: (_) => streamUsers()),
streamUsers method as follows
Stream<List<User>> streamUsers() {
var ref = Firestore.instance.collection('users');
return ref.snapshots().map((list) => list.documents.map((doc) => User.fromFirestore(doc)).toList());
}
Then in our UI widget we simply call Provider to get any value from our data set (List<User>). In this case - only length.
Text("${Provider.of<List<User>>(context).length}")
Now everything updates automatically once any data changes are made.