I have a list class called StoreList which is a list class with parameter List. StoreList variables are meant to be used with loca,flutter,dart"/>

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I have a list class called StoreList which is a list class with parameter List. StoreList variables are meant to be used with loca

flutter - 转换列表列出: Unhandled Exception: type 'List' is not a subtype of type 'List'

I have a list class called StoreList which is a list class with parameter List. StoreList variables are meant to be used with loca

问题描述

I have a list class called StoreList which is a list class with parameter List. StoreList variables are meant to be used with local storage package.

When I try to retrieve data from the local storage using the package, the package function returns type List. I want to convert that to List. How do I do that? My code is as follows:

  Future<StoreList> getStoresFromLocalStorage() async {
    var storeInit = await storesLS.getItem('stores');
    StoreList stores = StoreList();
    if (storeInit == null) {
      stores.stores = List<Store>.empty(growable: true);
    }
    else {
      print(storeInit.toString()); // Output is [{id: C1, name: Store1, api: 'https://.....']
      stores.stores = storeInit;   // THIS IS THE PROBLEMATIC STATEMENT
    }
    return stores;
  }

EDIT:- I checked the types of the variables and they are as follows:-

storeInit => List

stores.stores => List

storeInit[0/1/2....] => _InternalLinkedHashMap<String, dynamic>

EDIT 2:- Following is the Structure of the StoreList class

class StoreList {
  List<Store> stores = [];

  toJSONEncodable() {
    return stores.map((store) {
      return store.toJSONEncodable();
    }).toList();
  }
}

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标签： flutterdart

解决方案

The way to do this is to loop over your storeInit items and build a Store object with the Store.fromJson constructor

stores.stores = storeInit.map((data) => Store.fromJson(data)).toList();

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