Cast to model List<Map<String,dynamic>> issue flutter - flutter

Question

I want convert my response API to model repository in flutter but always get error in type of model
use Dio for api request
this is my response API :
{
"success": 1,
"list": [
{
"id": "1",
"driver_id": "11081",
"company_id": "9",
"school_id": "4",
"status": 1,
"createdAt": "2022-10-14T09:22:00.000Z",
"updatedAt": "2022-10-14T09:22:03.000Z"
},
{
"id": "2",
"driver_id": "11081",
"company_id": "9",
"school_id": "5",
"status": 1,
"createdAt": "2022-10-14T20:36:47.000Z",
"updatedAt": "2022-10-14T20:36:49.000Z"
}
]
}
I try get data like this :
Future<List<ServiceEntity>> getAll() async {
final List<ServiceEntity> services = [];
try {
final response = await httpClient.post("v1/teacher/get-list");
validateResponse(response);
(response.data['list'] as List).forEach((jsonObject) {
services.add(ServiceEntity.fromJson(jsonObject));
});
} on DioError catch (e) {
exceptionHttpRequest(e);
}
return services;
}
and model is :
class ServiceEntity {
final int id;
ServiceEntity.fromJson(Map<String, dynamic> json)
: id = json['id'];
}
When i build app and debug always get this error :
I/flutter (29931):
type 'String' is not a subtype of type 'int'
I test many things but in fact did not understand what is the issue

Answer 1

The problem is exactly what the error says. String is not a subtype of int.
Look at the data:
The "id" is stored as a String.
Then you try pull it out in the ServiceEntitys fromJson to an int.
a. Either just store the value as an int, because that's what it is, just b like the success field.
b. or parse the string into an int.
Below an example with chatty printing to explain the type changes.
const data = {
"id": "1",
};
try{
// value stored as a String
final value = data["id"] as String;
print(value.runtimeType);
print(value);
// parse into an int
final id = int.tryParse(value);
print(id.runtimeType);
print(id);
}catch(e){
print("ERROR ${e}");
}

Answer 2

Your id data type is String on response, to use it as int on model class you can parse to int,
id = int.tryParse(json['id']) ?? 0;
if parser failed, it will get 0.
More about converting json and tryParse