JSON关联数组到Dart/Flutter对象

Question

{
"cities": {
    "5": {
        "id": "5",
        "name": "New York"
    },
    "6": {
        "id": "6",
        "name": "Los Angeles"
    }
},
"total": 2,
"page": 1,
"total_pages": 1
}

class City {
  int id;
  String name;
  City(this.id, this.name);
  City.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    name = json['name'];
  }
}

Answer 1

您必须修复city类，因为来自json的'id'是String，所以您有两个选项：

1-用字符串替换int

class City {
 String id;

或

City.fromJson(Map<String, dynamic> json) {
    id = int.parse(json['id']);
    name = json['name'];
  }   

         final Map cityResponse = json.decode(data)["cities"];
            final List<City> cities = cityResponse.values
                .map((jsonValue) => City.fromJson(jsonValue))
                .toList();

            //now you have the list of your cities inside cities variable.    
            cities.forEach((city) => print("City: ${city.id} , ${city.name}"));