How put a future inside initState?

Question

I created a list but I put it my future in a stream builder and it rebuilds when I scroll so I'm trying to create a future method outside in initstate that I'll call in my code.

The problem is I used in the docs(), informations from streamBuilder so I can't access to these, when my code is outside. How can I do ?

This is my code

Future getNewUid() async {
    CollectionReference Users = FirebaseFirestore.instance.collection('Users');
    var response = await Users
        .doc(snapshot.data.docs[index]['uid']) //it doesn't take informations and it's red underlined
        .get();
        return response.data;
  }

  @override
  void initState() {
    var newUid = getNewUid();
    print(newUid);
    super.initState();
  }

And the rest

body: StreamBuilder(
        stream: BusiPosts.orderBy('time', descending: true).snapshots(),
        builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
          if (snapshot.hasError) {
            return Text('Something went wrong');
          }
          if (snapshot.connectionState == ConnectionState.waiting)
          {
            return Center(
                child: CircularProgressIndicator());
          }
              return ListView.builder(
                itemCount: snapshot.data.docs.length,
                itemBuilder: (context, index) {
                  return Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: <Widget>[
                        ListTile(
                            title: FutureBuilder<DocumentSnapshot>(
                              future: newUid,
                                  builder: (BuildContext context,
                                  AsyncSnapshot<DocumentSnapshot> snapshot) {
                                if (snapshot.hasError) {
                                  return Text("Something went wrong");
                                }
                                if (snapshot.hasData &&
                                    !snapshot.data!.exists) {
                                  return Text("Document does not exist");
                                }
                                if (snapshot.connectionState ==
                                    ConnectionState.done) {
                                  Map<String, dynamic> data = snapshot.data!.data() as Map<String, dynamic>;
                                  return GestureDetector(
                                    onTap: () =>
                                        navigateToDetail(data[index]),

I tried to edit with no success :/

    CollectionReference Users = FirebaseFirestore.instance.collection('Users');
    var futureResult = await Users
        .doc(snapshot.data.docs[index]['uid']) //it doesn't take informations and it's red underlined
        .get();
    return futureResult;
  }
  
  void initState() async{
    var futureResult = await myFutureFunction();
    super.initState();
  }

Solution

You could just do this:

Future getNewUid() async {
    CollectionReference Users = FirebaseFirestore.instance.collection('Users');
    var response = await Users
        .doc(snapshot.data.docs[index]['uid']) //it doesn't take informations and it's red underlined
        .get();
    newUid = response.data;
  }

@override
  void initState() {
   getNewUid();
   super.initState();
 }

Comments

[flowey]

The problem is it doesn't take the informations from ` .doc(snapshot.data.docs[index]['uid'])` because it comes from my stream builder insided my code to have the uid of the person who posted