My parsing code is like this.

  class Model {
      List<Info>? info,
      idx,
      name,
      image,
      kcal,
      effect,
      keep,
      tip,
      youtube01,
      youtube02,
      youtube03,
      season;

      Model(
      {this.info,
      this.idx,
      this.name,
      this.image,
      this.kcal,
      this.effect,
      this.keep,
      this.tip,
      this.youtube01,
      this.youtube02,
      this.youtube03,
      this.season});

      Model.fromJson(Map<String, dynamic> json)
      : idx = json['idx'],
        name = json['name'],
        image = json['image'],
        kcal = json['kcal'],
        info = json['info'],
        effect = json['effect'],
        keep = json['keep'],
        tip = json['tip'],
        youtube01 = json['youtube01'],
        youtube02 = json['youtube02'],
        youtube03 = json['youtube03'],
        season = json['season'];

        Map<String, dynamic> toJson() => {
        'idx': idx,
        'name': name,
        'image': image,
        'kcal': kcal,
        'info': info,
        'effect': effect,
        'keep': keep,
        'tip': tip,
        'youtube01': youtube01,
        'youtube02': youtube02,
        'youtube03': youtube03,
              'season': season,
           };
     }

And this is the code structure of the body.

  void _dataBase() async {
    var ref = FirebaseDatabase.instance
        .ref("Info/")
        .orderByChild("season")
        .equalTo("january04");
    ref.onValue.listen((DatabaseEvent event) {
      dataJson = event.snapshot.value;
      //var jsonResult = jsonDecode(dataJson);
      var models = Model.fromJson(dataJson);
      //print(dataJson);
      print(models);
    });
  }

But I am getting this error in console.

"Unhandled Exception: type '_InternalLinkedHashMap<Object?, Object?>' is not a subtype of type 'Map<String, dynamic>'"

Is the jsonparsing method wrong? No matter how you use jsonDecode or any method, an error appears. please help me how to do it. Thank U.

CodePudding user response：

You can use new Map<String, dynamic>.from(event.snapshot.value);

CodePudding user response：

1st check response is null or not then do this :

 Map<dynamic, dynamic> toJson() => { //Change here 
        'idx': idx,
        'name': name,
        'image': image,
        'kcal': kcal,
        'info': info,
        'effect': effect,
        'keep': keep,
        'tip': tip,
        'youtube01': youtube01,
        'youtube02': youtube02,
        'youtube03': youtube03,
              'season': season,
           };