问题描述
你好,我想解析 Json,我遇到了这个问题,有什么问题请帮助
错误是“List”不是“Map
模型
class CategoriesModel {
CategoriesModel({
this.id,this.title,this.price,this.description,this.image,});
int? id;
String? title;
double? price;
String? description;
String? image;
factory CategoriesModel.fromJson(Map<String,dynamic> json) {
return CategoriesModel(
id: json["id"],title: json["title"],price: json["price"].todouble(),description: json["description"],image: json["image"],);
}
Map<String,dynamic> toMap() => {
"id": id,"title": title,"price": price,"description": description,"image": image,};
}
在cubit我做到了(AppCubit.dart)
CategoriesModel? categoriesModel ;
getCategories(){
emit(OnLoadingCategoriesstate());
dioHelper.getData(pathUrl: "products").then((value){
categoriesModel = CategoriesModel.fromJson(value.data);
// catList = (value.data as List)
// .map((x) => CategoriesModel.fromJson(x))
// .toList();
// print(catList.length);
emit(OnSuccessCategoriesstate());
}).catchError((error){
emit(OnCatchErrorCategoriesstate(error.toString()));
print(error.toString());
});
}
static Future<Response> getData({required pathUrl})async{
return await dio.get(pathUrl);
}
这是来自 json
的小数据[
{
"id": 1,"title": "Fjallraven - Foldsack No. 1 Backpack,Fits 15 Laptops","price": 109.95,"description": "Your perfect pack for everyday use and walks in the forest. Stash your laptop (up to 15 inches) in the padded sleeve,your everyday","category": "men's clothing","image": "https://fakestoreapi.com/img/81fPKd-2AYL._AC_SL1500_.jpg"
},{
"id": 2,"title": "Mens Casual Premium Slim Fit T-Shirts ","price": 22.3,"description": "Slim-fitting style,contrast raglan long sleeve,three-button henley placket,light weight & soft fabric for breathable and comfortable wearing. And Solid stitched shirts with round neck made for durability and a great fit for casual fashion wear and diehard baseball fans. The Henley style round neckline includes a three-button placket.","image": "https://fakestoreapi.com/img/71-3HjGNDUL._AC_SY879._SX._UX._SY._UY_.jpg"
},]
最后这是我看到的错误
I/Flutter (31455): onChange -- AppCubit,Change { currentState: Instance of 'OnLoadingCategoriesstate',nextState: Instance of 'OnCatchErrorCategoriesstate' }
I/Flutter (31455): type 'List<dynamic>' is not a subtype of type 'Map<String,dynamic>'
任何帮助我将不胜感激
解决方法
CategoriesModel.fromJson
期望类型为 Map<String,dynamic>
,但 json 片段显示响应为 List
。
更新 .then
函数以处理列表并从 CategoriesModel
中的每个项目创建 List
,类似于上面代码段中注释掉的代码。
DioHelper.getData(pathUrl: "products").then((List values) {
values.map((e) => CategoriesModel.fromJson(e)).toList();
}