[FIXED] Flutter: Cannot initialise UID inside CollectionReference,when UID passed from One screen to Another

Issue

Goal: I want to pass the uid which i get from my homescreen.dart to my enroll.dart and access data inside the firestore collection using the passed uid

Here's how i pass data from homescreen.dart to enroll.dart

Future navigate(String id, String name) async {
Navigator.push(
    context,
    MaterialPageRoute(
        builder: ((context) => enroll(
              uid: id,
              name: name,
            ))));
   }

Here's how i access the data in my enroll.dart

class enroll extends StatefulWidget {
 final String uid;
 final String name;
 enroll({Key? key, required this.uid, required this.name}) : super(key: key);

 @override
 State<enroll> createState() => _enrollState();
}

class _enrollState extends State<enroll> {


 final CollectionReference programs =
    FirebaseFirestore.instance.collection(widget.uid); //This how i access the data
  }

Prolem: When i try to do so,it shows The instance member 'widget' can't be accessed in an initializer. Try replacing the reference to the instance member with a different expression

I tried giving the text widget the same by Text(widget.uid) and it work fine.

Iam new to flutter,Any help is Appreciated

Solution

You cannot use a value from widget ('uuid' here) before the method 'initState' of '_enrollState'. You need to wait the widget to be initialized.

You could do

class _enrollState extends State<enroll> {
    late final CollectionReference programs;
    
     @override
     void initState(){
         super.initState();
         programs = FirebaseFirestore.instance.collection(widget.uid); 
     }

}

Answered By - VincentDR
Answer Checked By - Katrina (JavaFixing Volunteer)