How to add json to an autocomplete widget in flutter - flutter

Question

Im trying to pass the data from an API to a list so that I can view it in the Autocomplete widget but I keep getting errors. I tried below code.
This is the code I have tried which passes data to the autocomplete as instance of 'Bus'
GetBuilder<BusesListController>(
init: BusesListController(),
builder: (_) {
_.viewPartners();
return DottedBorder(
child: Padding(
padding:
const EdgeInsets.only(left: 8.0),
child: Autocomplete<Bus>(
optionsBuilder: (TextEditingValue
textEditingValue) {
List<Bus> partnercos = [];
partnercos = _.partners.value as List<Bus>;
// (_.partners).map((value) => Bus.fromJson(value as Map<String, dynamic>)).toList();
print(partnercos);
return partnercos
.where((bus) => bus.company!
.toLowerCase()
.contains(textEditingValue
.text
.toLowerCase()))
.toList();
},
)),
);
}),
I also tried passing _.partners directly but it doesn't work either
Other fix I tried is passing _.partners instead of _.partners. Value above which invokes errors in arena.dart in void _tryToResolveArena which shows that state. Members.length == 1 hence scheduleMicrotask(() => _resolveByDefault(pointer, state));
Contoller code
class BusesListController extends GetxController {
var partners = [].obs;
var isLoaded = false.obs;
final loginController = Get.put(LoginController());
Future<void> viewPartners() async {
final token = loginController.rxToken.value;
var headers = {
'Authorization': 'Bearer $token'
};
try {
var url =
Uri.parse(ApiEndPoints.baseUrl + ApiEndPoints.endpoints.listBusAdmin);
http.Response response = await http.get(url, headers: headers);
if (response.statusCode == 200) {
final json = jsonDecode(response.body);
partners. Value =
(json as List).map((json) => Bus.fromJson(json)).toList();
isLoaded.value = true;
} else {
throw jsonDecode(response.body)["Message"] ?? "Unknown Error Occured";
}
} catch (error) {
// Get.snackbar('Error', error.toString());
}
}
#override
void onInit() {
super.onInit();
viewPartners();
}
}
I am able to print the response so I know the api works but I'm having problems with passing partners list into the autocomplete