Flutter Future<QuerySnapshot> empty

Question

Greetings everyone and thank you for your time upfront. As a very new member here i kindly ask to be not too harsh with me and my concern if i break any rule i wasnt aware of in this moment.

Situation: i was given flutter code to enhance with functions. The pre-existing code is getting data from a firestore database. I was asked to enhance the code to add user-management (admin functions). All persons involved are new to flutter so all code is basically done by examples from the.net.

Problem: So far so ok, but as soon as i call a future function on a querysnapshot, i dont get any userdata. I tried different approaches but none actually worked (eg cycling though the snapshot via for-loop, added a Firestore Indexer, added the rules, etc.)

In the following i give you an oversight over the firestore structure and the latest attempt to retrieve the data and sending to a listview builder:

FireStore

And this is the code:

 final _auth = FirebaseAuth.instance; CollectionReference _collectionRef = FirebaseFirestore.instance.collection('users'); class _UserlistScreenState extends State<UserlistScreen> { final currentUser = _auth.currentUser.email; @override void initState() { getUserList(); print(traceCount++); super.initState(); } var traceCount = 0; var snapshotData; var itemCount; var userList; Future<QuerySnapshot> getUserList() async { return userList = await _collectionRef.doc('settings').collection('userSettings') //.where('cid', isEqualTo: globals.CID).get(); } /*Function Cycle() { for (var doc in userList.docs) { print(doc.data); } }*/ @override Widget build(BuildContext context) { return SafeArea( child: Scaffold( appBar: AppBar( title: Hero( tag: 'logo', child: Image.asset( 'assets/rgb.png', height: MediaQuery.of(context).size.height * 0.05, fit: BoxFit.cover, ), ), actions: [], centerTitle: true, elevation: 4, ), body: BackgroundContainer( child: Column( children: [ Expanded( child: FutureBuilder( future: getUserList(), builder: (BuildContext context, AsyncSnapshot querySnapshot) { if (querySnapshot.hasData) { print(userList.docs); // test /*return ListView(children: getUser(querySnapshot));*/ // also test return ListView.builder( itemCount: userList.docs.length, itemBuilder: (BuildContext context, index) { var xname = userList.docs[index]['name'].toString(); var xemail = userList.docs[index]['email'].toString(); final List<Map> _tableData = [ {'id': 'Name:', 'content': xname}, {'id': 'Email:', 'content': xemail}, ]; return ListTile( enabled: true, selected: false, tileColor: Colors.black, leading: Icon(Icons.person), title: Text('Name'), subtitle: Text('Email'), /*title: Text("Name: " + // userList.data.docs[index].get('name')), userList.data.docs[index]['name'].toString()), subtitle: Text("Email: " + userList.data.docs[index].get('email')), // userList.data.docs[index]['email'].toString()),*/ onTap: () { showModalBottomSheet( context: context, builder: (context) => Container( height: 500, child: Padding( padding: const EdgeInsets.all(20.0), child: Table( border: TableBorder( horizontalInside: BorderSide(width: 1)), children: _tableData.map((data) { return TableRow( children: [ Container( padding: EdgeInsets.all(8.0), child: Text(data['id']), ), Container( padding: EdgeInsets.all(8.0), child: Text(data['content']), ), ], ); }).toList(), ), ), ), ); }, ); }, ); } else { return Center( child: CircularProgressIndicator(), ); } }), ), ], ), ), ), ); } }

Firestore rules:

 rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow read, write: if request.auth;= null; } } }

FireStore Index enter image description here

I feel code-blinded and cant find the basic mistake i am relying on. Help much appreciated.

Kind regards

Answer 1

your settings field is a collection not a document,

so these two lines in your code are referring to the data that you want:

   .doc('settings')
   .collection('userSettings')

they should be the opposite, like:

  Future<DocumentSnapshot> getUserList() async {
    return userList = await FirebaseFirestore.instance
        .doc('users/a@a.de/settings/userSettings')
        .get();
  }

the previous code would return the document "userSettings"