获取存储 | _CastError（“字符串”类型不是“列表”类型的子类型<dynamic> ？ 在类型转换中）</dynamic>

Question

我正在构建一个应用程序，用户可以在其中将收藏夹本地存储在他们的设备上。 我正在使用 GetStorage 来做到这一点。

这是我的 model class：

    import 'package:cloud_firestore/cloud_firestore.dart';

class Product {
  final String id;
  final String name;
  final double price;
  final String image;
  var rating;

  Product({
    required this.id,
    required this.name,
    required this.price,
    required this.image,
    required this.rating,
  });

  static Product fromSnapshot(DocumentSnapshot snap) {
    Product product = Product(
      id: snap.id,[enter image description here][1]
      name: snap['name'],
      price: snap['price'],
      image: snap['image'],
      rating: snap['rating'],
    );
    return product;
  }
}

这就是我面临的问题

class ProductController extends GetxController {

  TextEditingController searchTextController = TextEditingController();
  var products = <Product>[].obs;
  var favStorage = GetStorage();
  var favorateList = <Product>[].obs;
  var searchList = <Product>[].obs;
  

  @override
  void onInit() {
    super.onInit();
    List? storagedFaves = favStorage.read<List>('isFavoratesList');
    if (storagedFaves != null) {
      favorateList =
          storagedFaves.map((e) => Product.fromSnapshot(e)).toList().obs ;
    }

    addProduct();
  }

  void addProduct() {
    products.bindStream(FirebaseDB().getAllProducts());
  }

  void manageFavorates(String productId) async {
    var existingIndex =
        favorateList.indexWhere((element) => element.id == productId);
    if (existingIndex >= 0) {
      

    } else {
      
      favorateList
          .add(products.firstWhere((element) => element.id == productId));
    }
    await favStorage.write('isFavoratesList', favorateList);
  }

  bool isFavorates(String productId) {
    return favorateList.any((element) => element.id == productId);
  }

一切正常，但这部分

List? storagedFaves = favStorage.read<List>('isFavoratesList');

我知道问题出在哪里，并且我理解它发生的原因，但我仍然无法解决它

Answer 1

您从 GetStorage() 获得的数据类型是字符串而不是列表，您必须对其进行转换。