didvan-app/lib/models/new_statistic/new_statistics_model.dart

class NewStatisticModel {
  final List<CategoryList> lists;

  NewStatisticModel({required this.lists});

  factory NewStatisticModel.fromJson(Map<String, dynamic> json) {
    return NewStatisticModel(
      lists: List<CategoryList>.from(
          json['lists'].map((x) => CategoryList.fromJson(x))),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'lists': List<dynamic>.from(lists.map((x) => x.toJson())),
    };
  }
}

class CategoryList {
  final int category;
  final String header;
  final List<Content> contents;

  CategoryList(
      {required this.category, required this.header, required this.contents});

  factory CategoryList.fromJson(Map<String, dynamic> json) {
    return CategoryList(
      category: json['category'],
      header: json['header'],
      contents:
          List<Content>.from(json['contents'].map((x) => Content.fromJson(x))),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'category': category,
      'header': header,
      'contents': List<dynamic>.from(contents.map((x) => x.toJson())),
    };
  }
}

class Content {
  final int id;
  final String label;
  final String title;
  final bool marked;
  final Data data;

  Content(
      {required this.id,
      required this.label,
      required this.title,
      required this.marked,
      required this.data});

  factory Content.fromJson(Map<String, dynamic> json) {
    return Content(
      id: json['id'],
      label: json['label'],
      title: json['title'],
      marked: json['marked'],
      data: Data.fromJson(json['data']),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'label': label,
      'title': title,
      'marked': marked,
      'data': data.toJson(),
    };
  }
}

class Data {
  final String p;
  final num dp;
  final String dt;

  Data({required this.p, required this.dp, required this.dt});

  factory Data.fromJson(Map<String, dynamic> json) {
    return Data(
      p: json['p'],
      dp: json['dp'],
      dt: json['dt'],
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'p': p,
      'dp': dp,
      'dt': dt,
    };
  }
}