flutter type error while parsing json data using json serialisable

Question

I am trying to parse data from a json. I think this image will help you to understand the problem.

I am getting Exception has occurred. _TypeError (type '(dynamic) => MainRank' is not a subtype of type '(String, dynamic) => MapEntry<dynamic, dynamic>' of 'transform')

If you hover over the body, you will see the black pop up with the data. ranks is a list and there are two extra properties there as well.

My MainRank class is like this

class MainRank{
  String divisionName;
  String tournamentName;

  final  List<Ranks> ranks; 

  MainRank(this.divisionName, this.tournamentName, this.ranks);
  factory MainRank.fromJson(Map<String, dynamic> json) =>
     _$MainRankFromJson(json);
  Map<String, dynamic> toJson() => _$MainRankToJson(this);
}

Please help me with a little bit explanation how it works in dart. I am from php/js background so data types seems giving me hard time :) Thank you,

EDIT Response from my api is

{
  ranks: [....],
  divisionName: "Division 2",
  tournamentName: "Season 4"
}

And code I am using to parse the json is

Future _getData() async{
var res = await CallApi().getData('standings/${widget.id}');
final body = json.decode(res.body);
// final matches = body['matches'];
var data;

if(body!=null){
   data = body.map((el) => MainRank.fromJson(el));
}
print(data);
 return null;
}

This is the line data = body.map((el) => MainRank.fromJson(el)); — Hkm Sadek
– Hkm Sadek, Commented Apr 10, 2019 at 19:48

diegoveloper · Accepted Answer · 2019-04-10 19:51:52Z

1

You want to get the MainRank from your json data, so :

Change this :

 var data;

 if(body!=null){
    data = body.map((el) => MainRank.fromJson(el));
 }

To this:

MainRank data;

if(body!=null){
    data = MainRank.fromJson(body);
 }

answered Apr 10, 2019 at 19:51

diegoveloper

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1 Comment

Hkm Sadek Over a year ago

Thanks. It worked. I was used to parsing list so I had to use map. :) now it all works nicely!

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