Flutter 为什么 (json.decode(str) as List).map((e) 不起作用

在id调试模式下，传递数据将停止在模型中工作.

https://i.stack.imgur.com/y9j9U.png个

https://i.stack.imgur.com/xyOWA.png，

我甚至不确定到底是什么问题. 这不是会话错误(以前就是一个问题).

错误可能就在这里:

List<SearchMountainDtoModel> searchMountainFromJson(String str) => List<SearchMountainDtoModel>.from(
    json.decode(str).map((x) => SearchMountainDtoModel.fromJson(x)));

这就是我要传递的数据

{"total":6,"data":[{"id":"mt_133daa03e5c983e6561666ccf","name":"Biokovo"},{"id":"mt_hghgaa03e5c983e6561666dd1","name":"Dinara"},{"id":"mt_62daa03e5c983e65616660f4","name":"Medvednica"},{"id":"mt_cc2gaa03e5c983e6561666tr4","name":"Papuk"},{"id":"mt_1adaa03e5c983e65616664d4","name":"Samoborsko gorje"},{"id":"mt_tt5daa03e5c983e6561666a37","name":"Sjeverni Velebit"}]}

这就是整个模型

List<SearchMountainDtoModel> searchMountainFromJson(String str) =>
    (json.decode(str) as List<dynamic>).map((e) => SearchMountainDtoModel.fromJson(e)).toList();

String searchMountainToJson(List<SearchMountainDtoModel> data) =>
    json.encode(data.map((e) => e.toJson()).toList());

class SearchMountainDtoModel {
  SearchMountainDtoModel({
    required this.name,

  });

  String name;

  factory SearchMountainDtoModel.fromJson(Map<String, dynamic> json) => SearchMountainDtoModel(
    name: json["name"],
  );

  Map<String, dynamic> toJson() => {
    "name": name,

  };
}

我能看到的唯一错误: [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: NoSuchMethodError: The method '[]' was called on null. E/flutter ( 9810): Receiver: null个 也许和这件事无关