problem converting json response to object in Flutter - json

Question

first all sorry about my "engrish"...
I'm trying to consume an own API method with http package in Flutter.
I'm able to get a response from API but I'm having trouble trying to map the response (json) to my custom object called APILoginResponse.
I'm calling the API method like this:
APILoginResponse apiLogin = await api.apiLogin();
but I'm getting a runtime error "dynamic is not subtype of AccessToken".
Here is my API login method:
Future<APILoginResponse> apiLogin() async {
final http.Response response = await http.post(
api_end_point + '/api/Auth/login',
headers: <String, String>{
'Content-Type': 'application/json; charset=UTF-8',
},
body: jsonEncode(
<String, String>{'userName': api_user, 'password': api_password}),
);
if (response.statusCode == 200) {
return APILoginResponse.fromJson(json.decode(response.body));
} else {
throw Exception('Error en login de la API');
}
}
...and here is my APILoginResponse object:
class APILoginResponse {
final AccessToken accessToken;
final String refreshToken;
APILoginResponse({this.accessToken, this.refreshToken});
factory APILoginResponse.fromJson(Map<String, dynamic> json) {
return APILoginResponse(
accessToken: json['accessToken'],
refreshToken: json['refreshToken'],
);
}
}
class AccessToken {
String token;
int expiresIn;
}
error is in the line:
accessToken: json['accessToken']
inside APILoginResponse class.
Here is my json response:
{
"accessToken": {
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJodHRwOi8vc2NoZW1hcy5taWNyb3NvZnQuY29tL3dzLzIwMDgvMDYvaWRlbnRpdHkvY2xhaW1zL3JvbGUiOiIiLCJzdWIiOiJib3N0b25jcmVkX2NsaWVudGVzIiwianRpIjoiZjBkMzY0ZDMtMmRkNS00NzkzLWE5ZTktMzY1YzJmODNiYmI3IiwiaWF0IjoxNTk0MTMxODAwLCJyb2wiOiJhcGlfYWNjZXNzIiwiaWQiOiIyMzg3YTMzZi1hYzE5LTRhMzYtODcyZC04MTE3MzExZDFjY2IiLCJuYmYiOjE1OTQxMzE3OTksImV4cCI6MTU5NDEzMjM5OSwiaXNzIjoid2ViQXBpIiwiYXVkIjoiaHR0cHM6Ly9sb2NhbGhvc3Q6NDQzMTcvLyJ9.PqCPkVct4e4duWFEr63fALZ0h_0x25vsV_GBx336Apw",
"expiresIn": 600
},
"refreshToken": "W6wyiw9xYuC2UaJmyCOYujKIZTs0jAscnfcWTrEyVIk="
}
Any help with this will be appreciated. Thanks!

Answer 1

If you are sure that the returning value is an AccessToken you can try this:
factory APILoginResponse.fromJson(Map<String, dynamic> json) {
return APILoginResponse(
accessToken: (json['accessToken'] as Map<String,dynamic>) as AccessToken ?? null,
refreshToken: json['refreshToken'],
);
}
Change your AccessToken class to this:
class AccessToken {
final Map<String,dynamic> tokenData;
AccessToken(tokenData)
}

Answer 2

well I think #P4yam answer was right but I was getting the same error over and over, so I changed my APILoginResponse class as follow:
class APILoginResponse {
AccessToken accessToken;
String refreshToken;
APILoginResponse({this.accessToken, this.refreshToken});
APILoginResponse.fromJson(Map<String, dynamic> json) {
accessToken = json['accessToken'] != null
? new AccessToken.fromJson(json['accessToken'])
: null;
refreshToken = json['refreshToken'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
if (this.accessToken != null) {
data['accessToken'] = this.accessToken.toJson();
}
data['refreshToken'] = this.refreshToken;
return data;
}
}
class AccessToken {
String token;
int expiresIn;
AccessToken({this.token, this.expiresIn});
AccessToken.fromJson(Map<String, dynamic> json) {
token = json['token'];
expiresIn = json['expiresIn'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['token'] = this.token;
data['expiresIn'] = this.expiresIn;
return data;
}
}
and everything works fine now! thanks!