Question

我很陌生，所以让我知道是否有人需要更多信息。我一直在尝试在我的flutter应用程序中使用Hive。我想为我编写的称为Product的类生成自定义适配器。当我运行“ flutter包pub run build_runner build”时，这就是我的输出：

NoSuchMethodError: The getter 'element' was called on null.
Receiver: null
Tried calling: element
[SEVERE] hive_generator:hive_generator on lib/Pages/Content Cards/productCard.dart:

NoSuchMethodError: The getter 'element' was called on null.
Receiver: null
Tried calling: element
[SEVERE] hive_generator:hive_generator on lib/Pages/Content Cards/featuredCard.dart:

NoSuchMethodError: The getter 'element' was called on null.
Receiver: null
Tried calling: element
[INFO] 19.8s elapsed, 5/14 actions completed.
[WARNING] hive_generator:hive_generator on lib/Models/product.dart:
Missing "part 'product.g.dart';".
[INFO] Running build completed, took 20.2s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 42ms

[SEVERE] Failed after 20.2s
pub finished with exit code 1

这是产品类：https://pastebin.com/0a0W18ep

这是productCard.dart：https://pastebin.com/gV7kP2YG

这是FeaturedCard.dart：https://pastebin.com/7tke6V17

这是我pubsec.yaml的相关部分：

dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.3
  http: ^0.12.2
  hive: ^1.4.4
  hive_flutter: ^0.3.1
  # For OS-specific directory paths
  path_provider: ^1.6.18

dev_dependencies:
  build_runner:
  flutter_test:
    sdk: flutter
  hive_generator:

dependency_overrides:
  analyzer:

我尝试过更改build_runner和分析器的版本，并在从中提取值之前检查产品对象是否为null。不幸的是没有一个工作。

Answer 1

错误消息表明您是Missing "part 'product.g.dart';".。

我检查了您的代码，但它丢失了。在product.dart中添加此缺失的语句。

import 'package:hive/hive.dart';
 
part 'product.g.dart';

@HiveType(typeId: 1)
class Product {
   /// other code ...
}

得到“ NoSuchMethodError：吸气剂'element'被调用为null。”使用build_runner时

1 个答案: