Question 136875 in Flutter Question posted in
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Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>' Flutter dart

Am getting this error in flutter, dart.

‘_InternalLinkedHashMap<String, dynamic>’ is not a subtype of type
‘List’

The Model used is,

import 'dart:convert';

Areas areasFromJson(String str) => Areas.fromJson(json.decode(str));

String areasToJson(Areas data) => json.encode(data.toJson());

class Areas {
  bool success;
  Data data;
  String message;

  Areas({
    required this.success,
    required this.data,
    required this.message,
  });

  factory Areas.fromJson(Map<String, dynamic> json) => Areas(
    success: json["success"],
    data: Data.fromJson(json["data"]),
    message: json["message"],
  );

  Map<String, dynamic> toJson() => {
    "success": success,
    "data": data.toJson(),
    "message": message,
  };
}

class Data {
  List<Area> areas;

  Data({
    required this.areas,
  });

  factory Data.fromJson(Map<String, dynamic> json) => Data(
    areas: List<Area>.from(json["areas"].map((x) => Area.fromJson(x))),
  );

  Map<String, dynamic> toJson() => {
    "areas": List<dynamic>.from(areas.map((x) => x.toJson())),
  };
}

class Area {
  int id;
  String name;
  String state;
  String country;
  DateTime createdAt;
  DateTime updatedAt;

  Area({
    required this.id,
    required this.name,
    required this.state,
    required this.country,
    required this.createdAt,
    required this.updatedAt,
  });

  factory Area.fromJson(Map<String, dynamic> json) => Area(
    id: json["id"],
    name: json["name"],
    state: json["state"],
    country: json["country"],
    createdAt: DateTime.parse(json["created_at"]),
    updatedAt: DateTime.parse(json["updated_at"]),
  );

  Map<String, dynamic> toJson() => {
    "id": id,
    "name": name,
    "state": state,
    "country": country,
    "created_at": createdAt.toIso8601String(),
    "updated_at": updatedAt.toIso8601String(),
  };
}

In the controller file, trying to call the GET API via override init @override

void initState() {
getAreas();
super.initState(); }

Future<List<Areas>> getAreas() async {
    final Map<String, String> headers = {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer $accessToken',
    };

    final response = await http.get(Uri.parse('https://idonor.ae/api/get-areas'),
        headers: headers);
    if (response.statusCode == 200) {
      final List result = json.decode(response.body);
      print(result);
      final String responseString = response.body;
      final Areas getAreas = Areas.fromJson(json.decode(responseString));
      print(getAreas.data.areas);
      return result.map((e) => Areas.fromJson(e)).toList();
    } else {
      throw Exception('Failed to load data');
    }
  }

I just looking to get the data and show in text data when the page loads.

Tags:

3

Answers


  1. 0

    excuse me.

    this is json object json.decode(response.body); not List

    final List result = json.decode(response.body);
print(result);

    delete to this lines

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  2. 0

    You already have the function to get area from json string areasFromJson.

    If you believe that the response.body is String type, simply pass response.body to areasFromJson, otherwise convert it to json string using json.encode(response.body)).

    Example:

    final Areas getAreas = areasFromJson(json.encode(response.body));
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  3. 0

    If you are trying to assign a map to a list, use the List.from constructor to create a list from the map values.

    For example:

    Map<String, dynamic> myMap = {'key1': 'value1', 'key2': 'value2'};

List<dynamic> myList = List.from(myMap.values);

print(myList); // Output: [value1, value2]
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