Json _CastError（type'；"InternalLinkedHashMap<；String，dynamic>；'；不是类型转换中的List<；dynamic>；'；类型的子类型）

想再问一次。。。尝试实现存储在本地数据库中的数据API。。。 JSON API的形式对象中有一个JSON数组。。。希望将数据从API加载到本地数据库时出错。。。大体上这是一个错误，因为“错误的模型或什么

Api服务

class MealApiProvider {
  Future<List<Categories>> getAllMeal() async {
    var url = "https://www.themealdb.com/api/json/v1/1/categories.php";
    Response response = await Dio().get(url);
    print("Hasil Respon ${response.data}");
    return (response.data as List).map((employee) {
      print('Inserting $employee');
      DBProvider.db.insertMeals(Categories.fromJson(employee));
    }).toList();
  }
}

错误

返回（response.data作为列表）.map（（员工）

---

您的回复一开始就包含map！ 试试这个

class MealApiProvider {
  Future<List<Categories>> getAllMeal() async {
    var url = "https://www.themealdb.com/api/json/v1/1/categories.php";
    Response response = await Dio().get(url);
    print("Hasil Respon ${response.data}");
    //***Change below line****
    return (response.data['categories'] as List).map((employee) {
      print('Inserting $employee');
      DBProvider.db.insertMeals(Categories.fromJson(employee));
    }).toList();
  }
}

class MealApiProvider{
Future getAllMine（）异步{
变量url=”https://www.themealdb.com/api/json/v1/1/categories.php";
Response=wait Dio（）.get（url）；
打印（“Hasil Respon${response.data}”）；
//***换行****
return（response.data['categories']作为列表）.map（（雇员）{
打印（“插入$employee”）；
DBProvider.db.insertfines（Categories.fromJson（employee））；
}).toList（）；
}
}

而不是

class MealApiProvider {
  Future<List<Categories>> getAllMeal() async {
    var url = "https://www.themealdb.com/api/json/v1/1/categories.php";
    Response response = await Dio().get(url);
    print("Hasil Respon ${response.data}");
    //*** I change the below line !
    return (response.data as List).map((employee) {
      print('Inserting $employee');
      DBProvider.db.insertMeals(Categories.fromJson(employee));
    }).toList();
  }
}

class MealApiProvider{
Future getAllMine（）异步{
变量url=”https://www.themealdb.com/api/json/v1/1/categories.php";
Response=wait Dio（）.get（url）；
打印（“Hasil Respon${response.data}”）；
//***我更改下面的行！
返回（response.data作为列表）.map（（员工）{
打印（“插入$employee”）；
DBProvider.db.insertfines（Categories.fromJson（employee））；
}).toList（）；
}
}

嘿，你在数组中使用了错误的数据类型，数组的使用列表和JSON对象的使用映射。请尝试一下，它会起作用。我更改了哪些代码？我不知道，但在看到你的响应后可能会更改。请看我已更新的图片

class MealApiProvider {
  Future<List<Categories>> getAllMeal() async {
    var url = "https://www.themealdb.com/api/json/v1/1/categories.php";
    Response response = await Dio().get(url);
    print("Hasil Respon ${response.data}");
    //***Change below line****
    return (response.data['categories'] as List).map((employee) {
      print('Inserting $employee');
      DBProvider.db.insertMeals(Categories.fromJson(employee));
    }).toList();
  }
}

class MealApiProvider {
  Future<List<Categories>> getAllMeal() async {
    var url = "https://www.themealdb.com/api/json/v1/1/categories.php";
    Response response = await Dio().get(url);
    print("Hasil Respon ${response.data}");
    //*** I change the below line !
    return (response.data as List).map((employee) {
      print('Inserting $employee');
      DBProvider.db.insertMeals(Categories.fromJson(employee));
    }).toList();
  }
}