小编Ajo*_*dat的帖子

我试图从数据库中获取值后返回Map，Future但我无法打印这些值。访问值时出现以下错误

The type 'Future<Map<String, dynamic>> Function()' used in the 'for' loop must implement Iterable.

下面是简单的代码。

class ChefDishes extends StatefulWidget {
  @override
  _ChefDishesState createState() => _ChefDishesState();
}

class _ChefDishesState extends State<ChefDishes> {
 @override
  Widget build(BuildContext context) {
    
     var _chefDishes = DatabaseService().getChefDishList;
    
     return Scaffold(
    .....
          Column(
            children: [
              for (var item in _chefDishes)   // <---- E R R O R   I S   H E R E  
                ListView(children: [
                  Text(item['dishname']),
                  Text(item['dishPrice']),
                ]),
            ],
          )
}

DatabaseService 班级

class DatabaseService …

我正在用 Python 实现 Google Cloud Platforms-Data Loss Prevention API 的标准实现，用于去识别文本。这是来自https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/dlp/deid.py中deidentify_with_fpe方法的示例

google.api_core.exceptions.InvalidArgument: 400 Received the following error message from Cloud KMS when unwrapping KmsWrappedCryptoKey "projects/xxxx-xxx/locations/global/keyRings/dlp-key-ring-4/cryptoKeys/key9": Decryption failed: the ciphertext is invalid.

Last login: Fri Feb 28 15:29:09 on ttys001
Restored session: Fri 28 Feb 2020 15:27:53 AEDT
xxxxs-MacBook-Pro:poc-bucket-flow-dlp xxxxxxxx$ python dlp3.py --verbosity=debug
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/google/api_core/grpc_helpers.py", line 57, in error_remapped_callable
    return callable_(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/grpc/_channel.py", line 826, in __call__
    return _end_unary_response_blocking(state, …