Nested JSON parsing flutter

Question

Error while parsing JSON flutter

I/flutter ( 6858): type 'MappedListIterable<dynamic, dynamic>' is not a subtype of type 'List<SearchModel>'

Where am I doing wrong? How could I parse exact file /line-location of error?

{
  "total": 24,
  "totalPages": 1,
  "currentPage": 1,
  "perPageRecords": 50,
  "values": [
    {
      "_id": "563e2cce31821525104dfe0c",
      "name": "dard ho dil mein to dawaa kiji",
      "deleted": false
    },
    {
      "_id": "563e2cce31821525104dfe0b",
      "name": "mulk-e-adam main yaaruun ky Id ho rahi hai",
      "description": "",
      "deleted": false
    }
]

Sample Model crearted this way

class SearchPagination {
  int total;
  int totalPages;
  String currentPage;
  int perPageRecords;
  List<SearchModel> values;

  SearchPagination({this.total, this.totalPages, this.currentPage, this.perPageRecords, this.values});

  factory SearchPagination.fromJson(Map<String, dynamic> json) {
    return SearchPagination(
      total: json["total"] as int,
      totalPages: json["totalPages"] as int,
      currentPage: json["currentPage"] as int,
      perPageRecords: json["perPageRecords"] as int,
      values: json["values"].map((a) => SearchModel.fromJson(a)),
    );
  }
}

class SearchModel {
  final String id;
  final String name;
  final String description;
  final bool deleted;

  SearchModel({this.id, this.name, this.description, this.deleted});

  factory SearchModel.fromJson(Map<SearchModel, dynamic> json) {
    return SearchModel(id: json["id"], name: json["name"], description: json["description"] as String, deleted: json["deleted"]);
  }
}

This way service is being called

  Future<SearchPagination> fetchSearches({int page: 1}) async {
    var url = Uri.https(baseFinalUrl, 'additional/searches', {'page': page.toString()});
    return _getJson(url).then((json) {
      print(json);

      return SearchPagination.fromJson(json);
    });
  }

What is exact error while parsing JSON? Is there any line to line debugger for a flutter?

Vicky Salunkhe · Accepted Answer · 2019-09-28 21:13:30Z

3

create your dart class by visiting here

paste your json data over there it will output the required class file

use that class file to fetch your json data

answered Sep 28, 2019 at 21:13

Vicky Salunkhe

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Comments

Chenna Reddy · Accepted Answer · 2019-09-28 21:00:23Z

1

Replace

      values: json["values"].map((a) => SearchModel.fromJson(a)),

with

      values: (json["values"] as List).map((a) => SearchModel.fromJson(a)).toList(),

Because the result of map isn't a list, it has to be converted to List.

edited Sep 28, 2019 at 21:00

answered Sep 28, 2019 at 20:51

Chenna Reddy

2,34119 silver badges17 bronze badges

4 Comments

Sankalp Over a year ago

this ended with I/flutter ( 7144): type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<SearchModel, dynamic>'

Chenna Reddy Over a year ago

Why is SearchModel.fromJson taking Map<SearchModel, dynamic> as argument, shouldn't it be SearchModel.fromJson(Map<String, dynamic> json)?

Sankalp Over a year ago

Corrected, Fixed. Thanks

Chenna Reddy Over a year ago

BTW, Its better to use json_serializable and json_annotation packages, to auto generate these methods. Worth a look

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