using ChangeNotifier to add items into empty list - flutter

Question

I already have data stored on firestore , but now i'd like to add this data into an empty list using ChangeNotifier , similar to this example -https://docs.flutter.dev/development/data-and-backend/state-mgmt/simple .
so below i'd like to add data stored on firebase into the _cart list , with the method I tried below I got the error The argument type 'List<Menu>' can't be assigned to the parameter type 'Menu'(would like to know why?) , it also contains the ui for where i'd like to map the data from cart list into the dialog sheet:
class AddList extends ConsumerWidget {
const AddList({Key? key}) : super(key: key);
#override
Widget build(BuildContext context, WidgetRef ref) {
final menuAsync = ref.watch(menuProvider);
final model = ref.read(cartProvider);
return Scaffold(
appBar: AppBar(
title: const Text("menu"),
),
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.black,
onPressed: () async {
showDialog(
context: context,
builder: (context) {
return AlertDialog(
title: const Text("cart"),
content: Column(
children: const [
...model.cart.map((item) => Text(item.mealName)),
],
),
);
});
},
),
body: menuAsync.when(
data: (menu) => Column(
children: menu
.map(
(e) => Card(
child: ListTile(
title: Text(e.mealName),
subtitle: Text(e.price),
trailing: IconButton(
onPressed: () {
model.addProduct(menu);//where im getting error
},
icon: const Icon(Icons.add)))),
)
.toList(),
),
error: (e, s) => Center(child: Text("$e")),
loading: () => const Center(child: CircularProgressIndicator())),
);
}
}
below im using changenotifier to modify the cart list:
final cartProvider =
ChangeNotifierProvider<CartNotifier>((ref) => CartNotifier());
class CartNotifier extends ChangeNotifier {
final List<Menu> _cart = [];
List<Menu> get cart => _cart;
void addProduct(Menu menu) {
_cart.add(menu);
notifyListeners();
}
void removeProduct(Menu menu) {
_cart.remove(menu);
notifyListeners();
}
}
how im reading data from firestore :
final menuProvider = StreamProvider<List<Menu>>(
(ref) => ref.read(addMealRespositoryProvider).menuSearchStream);
Stream<List<Menu>> get menuSearchStream =>
_firestore.collection("menu").snapshots().map(
(event) => event.docs.map((e) => Menu.fromFirestore(e)).toList(),
);
snippet of my data model:
class Menu {
String mealName;
String price;
Menu({
required this.mealName,
required this.price,
});
Map<String, dynamic> toMap() {
return {
"mealName": mealName,
"price": price, },
factory Menu.fromFirestore(DocumentSnapshot doc) {
final map = doc.data() as Map<String, dynamic>;
return Menu(
mealName: map["mealName"] ?? '',
price: map["price"] ?? '',
);
}
}