The argument type 'Stream<List<ObjectModel>>' can't be assigned to the parameter type 'List<ObjectModel>' - flutter

Question

I am using BLoC pattern (with rxdart package) to read a list of "EmpresaDatosModel" and when trying to include the sink it throws me the following error:
The argument type 'Stream <List < EmpresaDatosModel >>' can't be
assigned to the parameter type 'List < EmpresaDatosModel >'.
In the BLoC pattern I am using the following code:
class EmpresaDatosBloc {
final _empresaDatosController = new BehaviorSubject<List<EmpresaDatosModel>>();
Stream <List<EmpresaDatosModel>> get empresaDatosStream => _empresaDatosController.stream;
Stream<List<EmpresaDatosModel>> cargarEmpresasStream() {
final empresasList = _empresaDatosProvider.cargarEmpresasStream();
_empresaDatosController.sink.add(empresasList); //THE ERROR THROWS HERE
return empresasList;
}
dispose() {
_empresaDatosController?.close();
}
}
The provider where the query is made from Firebase RTDB has the following:
Stream<List<EmpresaDatosModel>> cargarEmpresasStream() {
Query resp = db.child('admon');
final empStream = resp.onValue;
final publicarStream = empStream.map((event) {
final empMap = Map<String, dynamic>.from(event.snapshot.value);
final empList = empMap.entries.map((e) {
return EmpresaDatosModel.fromJson(Map<String,dynamic>.from(e.value));
}).toList();
return empList;
});
return publicarStream;
}
And the display widget looks like this:
final empresaDatosBloc = Provider.empresaDatosBloc(context);
empresaDatosBloc.cargarEmpresasStream();
//---
return StreamBuilder(
stream: empresaDatosBloc.empresaDatosStream,
builder: (BuildContext context, snapshot){
final empresasList = [];
if (snapshot.hasData) {
final myList = snapshot.data as List<EmpresaDatosModel>;
myList.forEach((element) {
empresasList.add(element);
});
}
How can I assign a List<EmpresaDatosModel> to the sink in order to fix the error?

Answer 1

You can call .addStream on the _empresaDatosController BehaviorSubject .
This forwards data and error events to the controller's stream.
_empresaDatosController.addStream(empresasList);

Answer 2

Hope can help you.
Just keep a reference to StreamSubscription and use Stream.listen() method
class EmpresaDatosBloc {
StreamSubscription<void>? _subscription;
final _empresaDatosController = new BehaviorSubject<List<EmpresaDatosModel>>();
Stream <List<EmpresaDatosModel>> get empresaDatosStream => _empresaDatosController.stream;
void cargarEmpresasStream() {
_subscription?.cancel();
_subscription = _empresaDatosProvider.cargarEmpresasStream()
.listen(_empresaDatosController.add, onError: _empresaDatosController.addError);
}
dispose() {
_subscription?.cancel();
_empresaDatosController?.close();
}
}