flutter build runner 不工作 - getter 'uri' 被调用为 null [英] flutter build runner not working - The getter 'uri' was called on null

问题描述

我完美地将 flutter 与 build runner 一起使用，但今天它只是收到此 null 错误.甚至以为我恢复了我的代码更改，但仍然是同样的错误.

错误:

>[SEVERE] json_serializable:json_serializable on test/widget_test.dart:>NoSuchMethodError: getter 'uri' 在 null 上被调用.>接收者:空>尝试调用:uri>[INFO] 3.3 秒过去，1/17 动作完成.>[INFO] 4.4 秒过去，1/17 动作完成.>[INFO] 5.4 秒过去，1/17 动作完成.>[INFO] 6.4 秒过去，1/17 动作完成.>[INFO] 7.5 秒过去，1/17 动作完成.>[INFO] 8.5 秒过去，1/17 动作完成.>[INFO] 9.6 秒过去，1/17 动作完成.>[INFO] 10.7 秒过去，1/17 动作完成.>[INFO] 11.8 秒过去，1/17 动作完成.>[INFO] 12.9 秒过去，1/17 动作完成.>[INFO] 14.0 秒过去，1/17 动作完成.>[INFO] 15.0 秒过去，1/17 动作完成.>[INFO] 16.1 秒过去，1/17 动作完成.>[INFO] 17.1 秒过去，1/17 动作完成.>[警告] 15.1 秒内未完成任何操作，等待:>json_serializable:json_serializable 在 lib/common_widgets/alert_screens.dart>json_serializable:json_serializable 在 lib/common_widgets/app_logo.dart 上>json_serializable:json_serializable 在 lib/common_widgets/app_tab_bar.dart 上>json_serializable:json_serializable 在 lib/common_widgets/buttons_widgets.dart>json_serializable:json_serializable 在 lib/common_widgets/cards.dart 上>.. 还有 11 个>[INFO] 18.2 秒过去，1/17 动作完成.>[信息] 19.3 秒过去了，1/17 操作已完成.

而且一直这样.

我正在使用:

 sdk:>=2.7.0 <3.0.0"；颤动:^1.22.0build_runner: ^1.10.0json_serializable: ^3.5.0分析器:^0.41.1

我试图生成的模型:

<预><代码>导入 'package:flutter/foundation.dart';导入'包:json_annotation/json_annotation.dart';诊所.g.dart"部分；@JsonSerializable()班级诊所{最终成立年；最终字符串工作时间；最终字符串电话号码；最终字符串位置；诊所({@required this.establishmentYear,@required this.workingHours,@required this.phoneNumber,@required this.location,});factory Clinic.fromJson(Map json) =>_$ClinicFromJson(json);映射<字符串，动态>toJson() =>_$ClinicToJson(this);}

解决方案

更新到最新的flutter版本解决了这个问题

I was using flutter with build runner perfectly , but today it just getting this null error . Even thought I reverted my code changes but still the same error .

the error :

>[SEVERE] json_serializable:json_serializable on test/widget_test.dart:

>NoSuchMethodError: The getter 'uri' was called on null.
>Receiver: null
>Tried calling: uri
>[INFO] 3.3s elapsed, 1/17 actions completed.
>[INFO] 4.4s elapsed, 1/17 actions completed.
>[INFO] 5.4s elapsed, 1/17 actions completed.
>[INFO] 6.4s elapsed, 1/17 actions completed.
>[INFO] 7.5s elapsed, 1/17 actions completed.
>[INFO] 8.5s elapsed, 1/17 actions completed.
>[INFO] 9.6s elapsed, 1/17 actions completed.
>[INFO] 10.7s elapsed, 1/17 actions completed.
>[INFO] 11.8s elapsed, 1/17 actions completed.
>[INFO] 12.9s elapsed, 1/17 actions completed.
>[INFO] 14.0s elapsed, 1/17 actions completed.
>[INFO] 15.0s elapsed, 1/17 actions completed.
>[INFO] 16.1s elapsed, 1/17 actions completed.
>[INFO] 17.1s elapsed, 1/17 actions completed.
>[WARNING] No actions completed for 15.1s, waiting on:
>  json_serializable:json_serializable on lib/common_widgets/alert_screens.dart
>  json_serializable:json_serializable on lib/common_widgets/app_logo.dart
>  json_serializable:json_serializable on lib/common_widgets/app_tab_bar.dart
>  json_serializable:json_serializable on lib/common_widgets/buttons_widgets.dart
>  json_serializable:json_serializable on lib/common_widgets/cards.dart
>  .. and 11 more
>  [INFO] 18.2s elapsed, 1/17 actions completed.
>  [INFO] 19.3s elapsed, 1/17 actions completed.

and it keeps going on like that .

I am using :

    sdk: ">=2.7.0 <3.0.0"
    flutter: ^1.22.0
    build_runner: ^1.10.0
    json_serializable: ^3.5.0
    analyzer: ^0.41.1

the model I am trying to generate :

    import 'package:flutter/foundation.dart';
    import 'package:json_annotation/json_annotation.dart';
    
    part 'clinic.g.dart';
    
    @JsonSerializable()
    class Clinic {
      final int establishmentYear;
      final String workingHours;
      final String phoneNumber;
      final String location;
    
      Clinic({
        @required this.establishmentYear,
        @required this.workingHours,
        @required this.phoneNumber,
        @required this.location,
      });
    
      factory Clinic.fromJson(Map<String, dynamic> json) => _$ClinicFromJson(json);
      Map<String, dynamic> toJson() => _$ClinicToJson(this);
    }

解决方案

Updating to latest flutter version solved the issue

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