Question 74830 in Flutter Question posted in
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Flutter parsing error after correct response

Am a beginner in flutter development and am currently using dio for handling api calls. Currently the response is showing in the correct format after printing it. But in the parsing session I got error like this "type ‘List’ is not a subtype of type ‘Map<String, dynamic>’"

my model class

import 'package:object_mapper/object_mapper.dart';

class BottomNavListItem with Mappable {
int? id;
String? name;

@override
void mapping(Mapper map) {
map("id", id, (v) => id = v);
map("name", name, (v) => name = v);
}

}

response handling class

Future<List<BottomNavListItem>?> getFamilyStatus(String url) async {
Response response;
List<BottomNavListItem>? bottomNavListModel;
try {
response = await WebUtil.createDio().get(url);
if (kDebugMode) {
print(response.data.toString());
}
bottomNavListModel =
Mapper.fromJson(response.data).toObject<List<BottomNavListItem>>();
} on DioError catch (e) {

print(response.data.toString()); will prints :
[{id: 1, name: test}, {id: 2, name: MiddleClass}, {id: 3, name: UpperMiddleClass}, {id: 4, name: Rich}]
which is Json Array in correct format.
Anybody knows a solution pls help….

Tags:

3

Answers


  1. 0

    The result that you got from the Dio is a List of Maps (not a Map), which may be a List<Map<String, dynamic>>.

    You need to convert each of its items to BottomNavListItem with something like this:

    List<BottomNavListItem>? bottomNavListModel;

bottomNavListModel = response.data
    .map((e) => Mapper.fromJson(e).toObject<BottomNavListItem>()!)
    .toList();
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  2. 0

    The response that you are getting is list of a Map

    So you can’t do Mapper.fromJson(response.data) directly on response .

    You can instead iterate through each item and call Mapper.fromJson(response[i].data) may this will help.

    or to debug more easily you can try to find out runTimeType of your response
    by using print(response.runTimeType)

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  3. 0

    you need to parse the data like this

     response.data.forEach((item){
      bottomNavListModel?.add(BottomNavListItem.fromJson(item));
    });

    and update model like this…

    class BottomNavListItem with Mappable {
  int? id;
  String? name;

  @override
  void mapping(Mapper map) {
    map("id", id, (v) => id = v);
    map("name", name, (v) => name = v);
  }

  BottomNavListItem.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    name = json['name'];
  }
}
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