Flutter 从json赋值后打印类属性时获取null

我有一个类CityModel，当我试图给它赋值并打印任何值时，它得到了null值，现在是实值

这里是CityModel类文件

import 'package:flutter/material.dart';

class CityModel {
      String cityId;
      String nameAr;
      CityModel({@required cityId, @required nameAr});
}

这里是一个提供程序函数，我尝试将值分配给类城市属性

Response response = await httpService.getRequest(url);
  var parsedCities = response.data['data']['cities'] as List;

  if (response.statusCode == 200 && response.data['status_code'] == 201) {
    parsedCities.forEach((cityObject) {
      final String name = cityObject['name_ar'];

      final CityModel city =
          CityModel(cityId: cityObject['city_id'], nameAr: cityObject['name_ar']);
      cities.add(city);
      print(city.nameAr);
    });

ParsedCities包含城市对象列表 如果我打印cityObject['name_ar]，我得到了正确的值 但我的问题是，当我尝试打印city.name时，我得到的值为空

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我不知道为什么。

试试这个？当您声明“final String name=…”时，会发生某些类型转换：

Response response = await httpService.getRequest(url);
  var parsedCities = response.data['data']['cities'] as List;

  if (response.statusCode == 200 && response.data['status_code'] == 201) {
    parsedCities.forEach((cityObject) {
      final String name = cityObject['name_ar'];
      final String city = cityObject['city_id'];
      print(name);
      print(city);
      final CityModel city =
          CityModel(cityId: city, nameAr: name);
      cities.add(city);
      print(city.nameAr);
      print(city.cityId);
    });

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分享你的错误log@MoaidALRazhy没有错误只是打印空值不是正确的值我尝试了您的代码，没有打印任何内容我将cityId更改为整数现在打印city\u id和name，但仍然是city.nameAr和city.cityId打印空值谢谢我找到了错误。我忘了在模型类中添加这个关键字