Flutter Riverpod : How to Implement FutureProvider? - flutter

Question

I using Flutter Riverpod package to handling http request. I have simple Http get request to show all user from server, and i using manage it using FutureProvider from Flutter Riverpod package.
API
class UserGoogleApi {
Future<List<UserGoogleModel>> getAllUser() async {
final result = await reusableRequestServer.requestServer(() async {
final response =
await http.get('${appConfig.baseApiUrl}/${appConfig.userGoogleController}/getAllUser');
final Map<String, dynamic> responseJson = json.decode(response.body);
if (responseJson['status'] == 'ok') {
final List list = responseJson['data'];
final listUser = list.map((e) => UserGoogleModel.fromJson(e)).toList();
return listUser;
} else {
throw responseJson['message'];
}
});
return result;
}
}
User Provider
class UserProvider extends StateNotifier<UserGoogleModel> {
UserProvider([UserGoogleModel state]) : super(UserGoogleModel());
Future<UserGoogleModel> searchUserByIdOrEmail({
String idUser,
String emailuser,
String idOrEmail = 'email_user',
}) async {
final result = await _userGoogleApi.getUserByIdOrEmail(
idUser: idUser,
emailUser: emailuser,
idOrEmail: idOrEmail,
);
UserGoogleModel temp;
for (var item in result) {
temp = item;
}
state = UserGoogleModel(
idUser: temp.idUser,
createdDate: temp.createdDate,
emailUser: temp.emailUser,
imageUser: temp.emailUser,
nameUser: temp.nameUser,
tokenFcm: temp.tokenFcm,
listUser: state.listUser,
);
return temp;
}
Future<List<UserGoogleModel>> showAllUser() async {
final result = await _userGoogleApi.getAllUser();
state.listUser = result;
return result;
}
}
final userProvider = StateNotifierProvider((ref) => UserProvider());
final showAllUser = FutureProvider.autoDispose((ref) async {
final usrProvider = ref.read(userProvider);
final result = await usrProvider.showAllUser();
return result;
});
After that setup, i simply can call showAllUser like this :
Consumer((ctx, read) {
final provider = read(showAllUser);
return provider.when(
data: (value) {
return ListView.builder(
itemCount: value.length,
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
final result = value[index];
return Text(result.nameUser);
},
);
},
loading: () => const CircularProgressIndicator(),
error: (error, stackTrace) => Text('Error $error'),
);
}),
it's no problem if http request don't have required parameter, but i got problem if my http request required parameter. I don't know how to handle this.
Let's say , i have another http get to show specific user from id user or email user. Then API look like :
API
Future<List<UserGoogleModel>> getUserByIdOrEmail({
#required String idUser,
#required String emailUser,
#required String idOrEmail,
}) async {
final result = await reusableRequestServer.requestServer(() async {
final baseUrl =
'${appConfig.baseApiUrl}/${appConfig.userGoogleController}/getUserByIdOrEmail';
final chooseURL = idOrEmail == 'id_user'
? '$baseUrl?id_or_email=$idOrEmail&id_user=$idUser'
: '$baseUrl?id_or_email=$idOrEmail&email_user=$emailUser';
final response = await http.get(chooseURL);
final Map<String, dynamic> responseJson = json.decode(response.body);
if (responseJson['status'] == 'ok') {
final List list = responseJson['data'];
final listUser = list.map((e) => UserGoogleModel.fromJson(e)).toList();
return listUser;
} else {
throw responseJson['message'];
}
});
return result;
}
User Provider
final showSpecificUser = FutureProvider.autoDispose((ref) async {
final usrProvider = ref.read(userProvider);
final result = await usrProvider.searchUserByIdOrEmail(
idOrEmail: 'id_user',
idUser: usrProvider.state.idUser, // => warning on "state"
);
return result;
});
When i access idUser from userProvider using usrProvider.state.idUser , i got this warning.
The member 'state' can only be used within instance members of subclasses of 'package:state_notifier/state_notifier.dart'.
It's similiar problem with my question on this, but on that problem i already know to solved using read(userProvider.state) , but in FutureProvider i can't achieved same result using ref(userProvider).
I missed something ?

Answer 1

Warning: This is not a long-term solution
Assuming that your FutureProvider is being properly disposed after each use that should be a suitable workaround until the new changes to Riverpod are live. I did a quick test to see and it does work. Make sure you define a getter like this and don't override the default defined by StateNotifier.
class A extends StateNotifier<B> {
...
static final provider = StateNotifierProvider((ref) => A());
getState() => state;
...
}
final provider = FutureProvider.autoDispose((ref) async {
final a = ref.read(A.provider);
final t = a.getState();
print(t);
});
Not ideal but seems like a fine workaround. I believe the intention of state being inaccessible outside is to ensure state manipulations are handled by the StateNotifier itself, so using a getter in the meantime wouldn't be the end of the world.