When trying to read a collection from cloud_firestore, I’m using riverpod provider.

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import '../dataStructs.dart';

part 'ChargesProvider.g.dart';

@riverpod
class GetCharges extends _$GetCharges {
  @override
  Future<Charges> build({required Layers layer}) async {
    final layerNumber = layer.toDBName();
    final layerDoc = 'Layers-$layerNumber';

    final chargeSnapshot =
        await FirebaseFirestore.instance.collection('charge').doc(layerDoc).get();

    final chargeMap = chargeSnapshot.data()!;

    return Charges.fromMap(chargeMap);
  }
}

The above build function works, tested by writing the code inside it directly in onPressed of a button. So it gets the data without any errors.

But when called like below in onPressed of a button using ref.read the provider immediately disposes.

                    Align(
                      alignment: Alignment.centerRight,
                      child: CustomOutlinedButton(
                        text: 'Continue',
                        onPressed: () {
                                if (chosenProduct != null) {
                                  Charges charges;
                                  ref.read(GetChargesProvider(layer: chosenProduct.layers))
                                   .when(data: (chrg) {
                                    charges = chrg;
                                    print(charges);
                                    return AsyncValue.data(chrg);
                                  }, error: (err, stTrc) {
                                    print('ERROR: $err');
                                    return AsyncValue.data(defaultValue);
                                  }, loading: () {
                                    print('isLOADING');
                                    return AsyncValue.data(defaultValue);
                                  });
                                }
                              },
                      ),
                    ),

Below is the output on terminal.

Provider getChargesProvider:GetChargesProvider#53198(null) was initialized with AsyncLoading<Charges>()
isLOADING
Provider getChargesProvider:GetChargesProvider#53198(null) was disposed

I have tried saving my ref.read statement in a variable and then use it but got same results, it disposes. I am not using this provider anywhere else. Please suggest how to use the value of this provider. I’m using riverpod here because in case on the same page if this provider is required again, then it does not re-pull the data from firestore.