Get data for class from JSON - Flutter - flutter

Question

I have a class "DilemmData" whose variables are loaded with data like this:
if (prefs.containsKey('dilemms')) {
MyApp.dilemmList = DilemmData.decode(prefs.getString('dilemms')!);
}
Here is the class:
class DilemmData {
double percent;
final String title;
final String date;
final List<DilemmItemData> plus = [];
final List<DilemmItemData> minus = [];
DilemmData({
plus,
minus,
this.percent = 0,
this.title = '',
this.date = '',
});
static Map<String, dynamic> toJson(DilemmData dilemm) => {
'percent': dilemm.percent,
'title': dilemm.title,
'date': dilemm.date,
'plus': dilemm.plus.map((e) => e.toJson()).toList(),
'minus': dilemm.minus.map((e) => e.toJson()).toList(),
};
factory DilemmData.fromJson(Map<String, dynamic> json) {
print('BOBA: ${json['plus']}');
return DilemmData(
plus: json['plus'],
minus: json['minus'],
percent: json['percent'],
title: json['title'],
date: json['date'],
);
}
static String encode(List<DilemmData> dilemm) => json.encode(
dilemm
.map<Map<String, dynamic>>((dil) => DilemmData.toJson(dil))
.toList(),
);
static List<DilemmData> decode(String dilemm) =>
(json.decode(dilemm) as List<dynamic>)
.map<DilemmData>((dil) => DilemmData.fromJson(dil))
.toList();
}
class DilemmItemData {
final int importance;
final String argument;
DilemmItemData({this.importance = 0, this.argument = ''});
Map<String, dynamic> toJson() {
return {
'importance': importance,
'argument': argument,
};
}
factory DilemmItemData.fromJson(Map<String, dynamic> json) {
return DilemmItemData(
importance: json['importance'], argument: json['argument']);
}
static List<DilemmItemData> decode(String item) =>
(json.decode(item) as List<dynamic>)
.map<DilemmItemData>((dil) => DilemmItemData.fromJson(dil))
.toList();
}
But the plus and minus variables are always empty. Does anyone know how to fix this?

Answer 1

The following code snippet would do the trick. Converting a DilemmItemData from JSON was missing.
factory DilemmData.fromJson(Map<String, dynamic> json) {
return DilemmData(
plus: (json['plus'] as List)
.map((json) => DilemmItemData.fromJson(json))
.toList(),
minus: (json['minus'] as List)
.map((json) => DilemmItemData.fromJson(json))
.toList(),
percent: json['percent'],
title: json['title'],
date: json['date'],
);
}