Need help to parsing JSON in Flutter - dart

Question

I am trying to get data from the internet in Flutter.
But I am getting an error on JSON parsing.
Can anyone tell me what is the problem?
I am trying to get data from this URL
https://swapi.co/api/starships/
Example JSON
{
"count": 37,
"next": "https://swapi.co/api/starships/?page=2",
"previous": null,
"results": [
{
"name": "Executor",
"model": "Executor-class star dreadnought",
"manufacturer": "Kuat Drive Yards, Fondor Shipyards",
"cost_in_credits": "1143350000",
"length": "19000",
"max_atmosphering_speed": "n/a",
"crew": "279144",
"passengers": "38000",
"cargo_capacity": "250000000",
"consumables": "6 years",
"hyperdrive_rating": "2.0",
"MGLT": "40",
"starship_class": "Star dreadnought",
"pilots": [],
"films": [
"https://swapi.co/api/films/2/",
"https://swapi.co/api/films/3/"
],
"created": "2014-12-15T12:31:42.547000Z",
"edited": "2017-04-19T10:56:06.685592Z",
"url": "https://swapi.co/api/starships/15/"
},
]
}
Model class
class RestModel {
final String name;
final String model;
final String manufacturer;
final String cost_in_credits;
final String length;
final String max_atmosphering_speed;
final String crew;
final String passengers;
final String cargo_capacity;
final String consumables;
final String hyperdrive_rating;
final String MGLT;
final String starship_class;
final List films;
final String pilots;
final String created;
final String edited;
final String url;
RestModel(
{this.name,
this.model,
this.manufacturer,
this.cost_in_credits,
this.length,
this.max_atmosphering_speed,
this.crew,
this.passengers,
this.cargo_capacity,
this.consumables,
this.hyperdrive_rating,
this.MGLT,
this.starship_class,
this.films,
this.pilots,
this.created,
this.edited,
this.url});
factory RestModel.fromJson(Map<String, dynamic> json) {
return RestModel(
name: json["name"],
model: json["model"],
manufacturer: json["manufacturer"],
cost_in_credits: json["cost_in_credits"],
max_atmosphering_speed: json["max_atmosphering_speed"],
crew: json["crew"],
passengers: json["passengers"],
cargo_capacity: json["cargo_capacity"],
consumables: json["consumables"],
hyperdrive_rating: json["hyperdrive_rating"],
MGLT: json["MGLT"],
starship_class: json["starship_class"],
films: json["flims"],
pilots: json["pilots"],
created: json["created"],
edited: json["edited"],
url: json["url"],
);
}
}
and the Flutter code is:
final link = "https://swapi.co/api/starships/";
List<RestModel> list;
Future getData() async {
var res = await http
.get(Uri.encodeFull(link), headers: {"Accept":"application/json"});
if (res.statusCode == 200) {
var data = json.decode(res.body);
var rest = data["results"];
for (var model in rest) {
list.add(RestModel.fromJson(model));
}
print("List Size: ${list.length}");
}
}
The main problem is when it tries to fill data from JSON.
RestModel.fromJson(model)
so what I have to change to fix this problem.

Answer 1

Try to cast the data 'results' to List , like this :
var rest = data["results"] as List;
Updated
Now that we know the error log: "No static method 'fromJson' declared in class 'RestModel'"
It's because you are using a static method in this line:
list.add(RestModel.fromJson(model));
You must change the call in order to use the factory constructor, like this :
list.add(new RestModel.fromJson(model));