如何将 Flutter 和 Dart 列表与 Class 属性结合起来？

Question

class MonthModel {
  String? title;
  Months? months;

  MonthModel({this.title, this.months});
}

class Months {
  bool? january;
  bool? february;
  bool? march;
  bool? april;
  Months({this.january, this.february, this.march, this.april});
}

List<MonthModel> selectedMonths = [
  MonthModel(title: "January", months: Months(january: true)),
  MonthModel(title: "February", months: Months(february: true)),
];

一月和二月包含在列表中。 如何根据列表中添加的月份转换为月份 class？

我必须拥有几个月（一月：真，二月：真）的财产 class。

示例 json output

    "months" : {
     "january": true,
     "february": true
    }

Answer 1

我想你想要类似的东西

void main() {
  List<MonthModel> selectedMonths = [
    MonthModel(title: "January", months: Months(january: true)),
    MonthModel(title: "February", months: Months(february: true)),
  ];

  Months months = Months();

  for (final m in selectedMonths.map((e) => e.months).toList()) {
    if (m != null && m.january == true) {
      months.january = true;
    }
    if (m != null && m.february == true) {
      months.february = true;
    }
    if (m != null && m.march == true) {
      months.march = true;
    }
    if (m != null && m.april == true) {
      months.april = true;
    }
  }

  print(months.toString()); 
   ///Months(january: true, february: true, march: null, april: null)
}