我正面临这个问题，试图用 api 中的数据显示列表。 谁能告诉我哪里错了。
我的视图模型
Future<Future<List<SprintResults>?>> getSprintResults(String? raceId) async {
isGridLoading = true;
sprintResults = null;
return locator<MotorsportRepository>()
.getMotorsportSprintByEvent(raceId!)
.then((sprintResponse) {
sprintResults = sprintResponse;
isGridLoading = false;
notifyListeners();
return sprintResults;
}).catchError((onError) {
log('MotorSportViewModel.getSprintResults $onError');
isGridLoading = false;
notifyListeners();
return null;
});
}
json 响应
{
"data": {
"results": [
{
"driver": {
"code": null,
"country": "Italy",
"countryFlag": "",
"firstName": "Francesco",
"id": "1064",
"lastName": "Bagnaia",
"name": "Francesco Bagnaia",
"shortName": "F Bagnaia",
"sportsPersonId": "60c1fac9-e784-43a8-9c1c-1ac46b7e3af8"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 12,
"total": 12
},
"pos": "1",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "37",
"time": "20:35.2700",
"vehicleNo": "63"
},
{
"driver": {
"code": null,
"country": "Spain",
"countryFlag": "",
"firstName": "Alex",
"id": "865",
"lastName": "Rins",
"name": "Alex Rins",
"shortName": "A Rins",
"sportsPersonId": "16d33b43-aa91-418b-9350-201e86d9a2f9"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 9,
"total": 9
},
"pos": "2",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "4921",
"time": "2.545",
"vehicleNo": "42"
},
{
"driver": {
"code": null,
"country": "Spain",
"countryFlag": "",
"firstName": "Jorge",
"id": "840",
"lastName": "Martin",
"name": "Jorge Martin",
"shortName": "J Martin",
"sportsPersonId": "960aad72-372b-48a9-b272-9d4910b4dabe"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 7,
"total": 7
},
"pos": "3",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "33",
"time": "4.706",
"vehicleNo": "89"
},
{
"driver": {
"code": null,
"country": "Spain",
"countryFlag": "",
"firstName": "Aleix",
"id": "38",
"lastName": "Espargaro",
"name": "Aleix Espargaro",
"shortName": "A Espargaro",
"sportsPersonId": "2567b47c-4740-4652-8e3b-040abd5ded21"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 6,
"total": 6
},
"pos": "4",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9511",
"time": "5.052",
"vehicleNo": "41"
},
{
"driver": {
"code": null,
"country": "South Africa",
"countryFlag": "",
"firstName": "Brad",
"id": "35569",
"lastName": "Binder",
"name": "Brad Binder",
"shortName": "B Binder",
"sportsPersonId": "fd28cc70-e498-4f29-a232-5f889b58814d"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 5,
"total": 5
},
"pos": "5",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "6861",
"time": "8.175",
"vehicleNo": "33"
},
{
"driver": {
"code": "BEZ",
"country": "Italy",
"countryFlag": "",
"firstName": "Marco",
"id": "1425",
"lastName": "Bezzecchi",
"name": "Marco Bezzecchi",
"shortName": "M Bezzecchi",
"sportsPersonId": "767cd34f-f1dd-4816-8850-619a3e3d0884"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 4,
"total": 4
},
"pos": "6",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "10541",
"time": "8.877",
"vehicleNo": "72"
},
{
"driver": {
"code": "MRN",
"country": "Italy",
"countryFlag": "",
"firstName": "Luca",
"id": "967",
"lastName": "Marini",
"name": "Luca Marini",
"shortName": "L Marini",
"sportsPersonId": "8b5eff20-f181-466c-8e2e-f898cbc927b5"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 3,
"total": 3
},
"pos": "7",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "10541",
"time": "9.453",
"vehicleNo": "10"
},
{
"driver": {
"code": null,
"country": "Portugal",
"countryFlag": "",
"firstName": "Miguel",
"id": "307",
"lastName": "Oliveira",
"name": "Miguel Oliveira",
"shortName": "M Oliveira",
"sportsPersonId": "312262fa-999a-4565-a18f-a6d67e4e6b59"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 2,
"total": 2
},
"pos": "8",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "10551",
"time": "10.768",
"vehicleNo": "88"
},
{
"driver": {
"code": null,
"country": "Australia",
"countryFlag": "",
"firstName": "Jack",
"id": "486",
"lastName": "Miller",
"name": "Jack Miller",
"shortName": "J Miller",
"sportsPersonId": "4690fd92-4274-42b0-baf0-989dc21f5d43"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 1,
"total": 1
},
"pos": "9",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "6861",
"time": "12.448",
"vehicleNo": "43"
},
{
"driver": {
"code": null,
"country": "Spain",
"countryFlag": "",
"firstName": "Maverick",
"id": "150",
"lastName": "Vinales",
"name": "Maverick Vinales",
"shortName": "M Vinales",
"sportsPersonId": "32f9bb23-68d7-4d7a-a978-8ef2a37c9af9"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "10",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9511",
"time": "12.739",
"vehicleNo": "12"
},
{
"driver": {
"code": null,
"country": "France",
"countryFlag": "",
"firstName": "Johann",
"id": "90",
"lastName": "Zarco",
"name": "Johann Zarco",
"shortName": "J Zarco",
"sportsPersonId": "2fc6d473-9ec4-426f-a8bc-3cc5858a4173"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "11",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "33",
"time": "14.251",
"vehicleNo": "5"
},
{
"driver": {
"code": "MIR",
"country": "Spain",
"countryFlag": "",
"firstName": "Joan",
"id": "77512",
"lastName": "Mir",
"name": "Joan Mir",
"shortName": "J Mir",
"sportsPersonId": "e2c49d5f-adae-43aa-b171-801c6cd2315c"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "12",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "29",
"time": "14.988",
"vehicleNo": "36"
},
{
"driver": {
"code": null,
"country": "Japan",
"countryFlag": "",
"firstName": "Takaaki",
"id": "8577",
"lastName": "Nakagami",
"name": "Takaaki Nakagami",
"shortName": "T Nakagami",
"sportsPersonId": "02dba89e-756f-40a0-80d8-9b4b346607da"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "13",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "36",
"time": "15.592",
"vehicleNo": "30"
},
{
"driver": {
"code": null,
"country": "Italy",
"countryFlag": "",
"firstName": "Franco",
"id": "4933",
"lastName": "Morbidelli",
"name": "Franco Morbidelli",
"shortName": "F Morbidelli",
"sportsPersonId": "64061f00-bb40-4ec5-a440-1ccef46dd67c"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "14",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9491",
"time": "16.534",
"vehicleNo": "21"
},
{
"driver": {
"code": "FER",
"country": "Spain",
"countryFlag": "",
"firstName": "Raul",
"id": "1427",
"lastName": "Fernandez",
"name": "Raul Fernandez",
"shortName": "R Fernandez",
"sportsPersonId": "783bf954-9bd2-42cc-842e-a3a1ec6442d0"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "15",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "10551",
"time": "19.290",
"vehicleNo": "25"
},
{
"driver": {
"code": null,
"country": "Spain",
"countryFlag": "",
"firstName": "Augusto",
"id": "89078",
"lastName": "Fernandez",
"name": "Augusto Fernandez",
"shortName": "A Fernandez",
"sportsPersonId": "7f106afd-2765-41ae-9611-e2c24c848b0e"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "16",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9201",
"time": "23.128",
"vehicleNo": "37"
},
{
"driver": {
"code": "GIA",
"country": "Italy",
"countryFlag": "",
"firstName": "Fabio",
"id": "3403",
"lastName": "Di Giannantonio",
"name": "Fabio Di Giannantonio",
"shortName": "F Di Giannantonio",
"sportsPersonId": "0ca7e1fb-99ae-4881-83b7-84ae2106dcc5"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "17",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "10531",
"time": "25.626",
"vehicleNo": "49"
},
{
"driver": {
"code": "BRA",
"country": "Germany",
"countryFlag": "/media/g2weh1nr/de.png",
"firstName": "Stefan",
"id": "250047",
"lastName": "Bradl",
"name": "Stefan Bradl",
"shortName": "S Bradl",
"sportsPersonId": "68988b7c-15d5-4683-bcf7-343efa0aa52b"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "18",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "29",
"time": "25.787",
"vehicleNo": "6"
},
{
"driver": {
"code": null,
"country": "France",
"countryFlag": "",
"firstName": "Fabio",
"id": "880",
"lastName": "Quartararo",
"name": "Fabio Quartararo",
"shortName": "F Quartararo",
"sportsPersonId": "d0c19913-36da-40f2-9d77-a7eab19593af"
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "19",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9491",
"time": "27.169",
"vehicleNo": "20"
},
{
"driver": {
"code": null,
"country": "Germany",
"countryFlag": "",
"firstName": "Jonas",
"id": "109",
"lastName": "Folger",
"name": "Jonas Folger",
"shortName": "J Folger",
"sportsPersonId": null
},
"laps": "10",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "20",
"status": {
"id": 1,
"name": "On-Track"
},
"teamId": "9201",
"time": "46.973",
"vehicleNo": "94"
},
{
"driver": {
"code": "MAR",
"country": "Spain",
"countryFlag": "",
"firstName": "Alex",
"id": "35570",
"lastName": "Marquez",
"name": "Alex Marquez",
"shortName": "A Marquez",
"sportsPersonId": "43bcb844-431e-406f-a73b-a730d1e1f12f"
},
"laps": "6",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "21",
"status": {
"id": 3,
"name": "Retired"
},
"teamId": "10531",
"time": "4 LAP(s)",
"vehicleNo": "73"
},
{
"driver": {
"code": null,
"country": "Italy",
"countryFlag": "",
"firstName": "Michele",
"id": "257",
"lastName": "Pirro",
"name": "Michele Pirro",
"shortName": "M Pirro",
"sportsPersonId": "5491e763-648a-447f-b73a-7ea0876a07d3"
},
"laps": "5",
"pits": "0",
"points": {
"bonus": 0,
"penalty": 0,
"race": 0,
"total": 0
},
"pos": "22",
"status": {
"id": 3,
"name": "Retired"
},
"teamId": "37",
"time": "5 LAP(s)",
"vehicleNo": "51"
}
],
"teams": [
{
"engine": "Ducati",
"id": "37",
"name": "Ducati Lenovo Team",
"shortName": "Ducati Lenovo Team",
"sportsTeamId": "7b54beb4-ba12-4da2-b1c1-7e2e202b9802",
"vehicle": "Ducati Desmosedici GP23",
"logo": null
},
{
"engine": "Honda",
"id": "4921",
"name": "LCR Honda CASTROL",
"shortName": "LCR Honda CASTROL",
"sportsTeamId": "aea0a84e-3c8d-444e-9909-2513a467d6d6",
"vehicle": "Honda RC213V",
"logo": null
},
{
"engine": "Ducati",
"id": "33",
"name": "Pramac Racing",
"shortName": "Pramac Racing",
"sportsTeamId": "48193907-d4cb-4d8e-abda-9bd5054387b0",
"vehicle": "Ducati Desmosedici GP23",
"logo": null
},
{
"engine": "Aprilia",
"id": "9511",
"name": "Aprilia Racing",
"shortName": "Aprilia Racing",
"sportsTeamId": "c153902d-86e1-4f6b-9ea6-6559e6e823e9",
"vehicle": "Aprilia RS-GP",
"logo": null
},
{
"engine": "KTM",
"id": "6861",
"name": "Red Bull KTM Factory Racing",
"shortName": "Red Bull KTM Factory Racing",
"sportsTeamId": "c0e6d30e-7bd4-43b8-af3e-a31e8004e4dd",
"vehicle": "KTM RC16",
"logo": null
},
{
"engine": "Ducati",
"id": "10541",
"name": "Mooney VR46 Racing Team",
"shortName": "Mooney VR46 Racing Team",
"sportsTeamId": "3c21d90a-2aaf-4065-8399-f837041ff2c3",
"vehicle": "Ducati Desmosedici GP22",
"logo": null
},
{
"engine": "Aprilia",
"id": "10551",
"name": "WithU Yamaha RNF MotoGP Racing",
"shortName": "WithU Yamaha RNF MotoGP Racing",
"sportsTeamId": "c034d82c-6c5a-40f2-8267-6bb387baf655",
"vehicle": "RS-GP",
"logo": null
},
{
"engine": "Honda",
"id": "29",
"name": "Repsol Honda Team",
"shortName": "Repsol Honda Team",
"sportsTeamId": "9a5ba232-bcb4-4325-8bcb-274a9d2e5390",
"vehicle": "Honda RC213V",
"logo": null
},
{
"engine": "Honda",
"id": "36",
"name": "LCR Honda",
"shortName": "LCR Honda",
"sportsTeamId": "ab3f63c4-e71a-42c3-979e-abb5734f8176",
"vehicle": "Honda RC213V",
"logo": null
},
{
"engine": "Yamaha",
"id": "9491",
"name": "Monster Energy Yamaha MotoGP",
"shortName": "Monster Energy Yamaha MotoGP",
"sportsTeamId": "dd62364d-7fc7-47f7-ac9f-10c2277c382d",
"vehicle": "Yamaha YZR-M1",
"logo": null
},
{
"engine": "Gas Gas",
"id": "9201",
"name": "Tech3 KTM Factory Racing",
"shortName": "Tech3 KTM Factory Racing",
"sportsTeamId": "ef85a5eb-91f1-4846-8694-c262756b043d",
"vehicle": "RC16",
"logo": null
},
{
"engine": "Ducati",
"id": "10531",
"name": "Gresini Racing MotoGP",
"shortName": "Gresini Racing MotoGP",
"sportsTeamId": "61799e9d-6aa2-4eee-8289-6e123bc1ed44",
"vehicle": "Ducati Desmosedici GP22",
"logo": null
}
]
},
"event": {
"endDate": "2023-04-15T21:00:00Z",
"id": "70421",
"name": "Americas GP",
"sportsEventId": "4b57b84e-d584-43f5-8a8c-48996e60e1c9",
"startDate": "2023-04-15T20:00:00Z"
},
"grandPreNo": 3,
"raceTrack": "Circuit of the Americas",
"season": {
"id": "2023",
"name": "2023",
"sportsSeasonId": "9fa65bc1-ffcd-483b-b69e-976c378bccba"
},
"session": {
"id": 5,
"name": "Sprint Qualifier"
},
"tour": {
"id": "3",
"name": "MotoGP",
"sportsTourId": "f99a9039-aafc-442a-a2c0-0df6d4572c99"
},
"venue": {
"city": "Austin",
"country": "USA",
"countryISO3": "USA",
"name": "Circuit of the Americas, Austin",
"track": {
"laps": "20",
"length": "5.514 KM"
}
}
}
我的模特班：
class SprintResults extends Equatable {
final Data? data;
final Event? event;
final int? grandPreNo;
final String? raceTrack;
final Season? season;
final Status? session;
final Tour? tour;
final Venue? venue;
const SprintResults(
{this.data,
this.event,
this.grandPreNo,
this.raceTrack,
this.season,
this.session,
this.tour,
this.venue});
factory SprintResults.fromJson(Map<String, dynamic> json) {
final data = json['data'] != null ? Data.fromJson(json['data']) : null;
final event = json['event'] != null ? Event.fromJson(json['event']) : null;
final grandPreNo = json['grandPreNo'];
final raceTrack = json['raceTrack'];
final season =
json['season'] != null ? Season.fromJson(json['season']) : null;
final session =
json['session'] != null ? Status.fromJson(json['session']) : null;
final tour = json['tour'] != null ? Tour.fromJson(json['tour']) : null;
final venue = json['venue'] != null ? Venue.fromJson(json['venue']) : null;
return SprintResults(
data: data,
event: event,
grandPreNo: grandPreNo,
raceTrack: raceTrack,
season: season,
session: session,
tour: tour,
venue: venue);
}
Map<String, dynamic> toJson() {
return {
'data': data,
'event': event,
'grandPreNo': grandPreNo,
'raceTrack': raceTrack,
'season': season,
'session': session,
'tour': tour,
'venue': venue,
};
}
@override
List<Object?> get props {
return [
data,
event,
grandPreNo,
raceTrack,
season,
session,
tour,
venue,
];
}
}
从我的 viewmodel 类中，它捕获了 MotorSportViewModel.getSprintResults 类型的错误 '(dynamic) => RaceResult' is not a subtype of type '(String,dynamic) => MapEntry
您的帮助将不胜感激。
致力于此：
// 1 - Here you have to return as I explain by point 2
Future<List<SprintResults>?> getSprintResults(String? raceId) async {
isGridLoading = true;
var sprintResults = null;
try {
// 2- You have to know what exactly return getMotorsportSprintByEvent then return it as a Future
sprintResults = await locator<MotorsportRepository>().getMotorsportSprintByEvent(raceId!);
} catch (e) {
log('MotorSportViewModel.getSprintResults $e');
}
isGridLoading = false;
notifyListeners();
return sprintResults;
}