将 Flutter Freezed 字段名称重命名为 snake、pascal、kebab 或其他类似的名称答案

【问题标题】：Renaming Flutter Freezed field names to snake, pascal,kebab or anothing along those lines将 Flutter Freezed 字段名称重命名为 snake、pascal、kebab 或其他类似的名称
【发布时间】：2022-08-23 20:59:53
【问题描述】：

发布此问题以自己回答。希望这可以帮助某人。

问题：使用颤振 freezed 生成代码，但将 to 和 from json 字段名称更改为特定的重命名模式。

标签： flutter dart freezed json-serializable

【解决方案1】：

解决方案：

build.yaml

假设你有一个用freezed 写的课程，就像这样

import 'package:freezed_annotation/freezed_annotation.dart';
import 'dart:convert';

part 'my_calss.freezed.dart';
part 'my_calss.g.dart';

@freezed
abstract class MyCalss with _$MyCalss {
    const factory MyCalss({
        @required int field1,
        @required String field2,
    }) = _MyCalss;

    factory MyCalss.fromJson(Map<String, dynamic> json) => _$MyCalssFromJson(json);
}

更改类 my_calss.g.dart 以使用例如 pascal 案例：

将以下内容放入您的build.yaml

# targets:
#   $default:
#     builders:
#       freezed:
#         options:
#           union_key: type
#           union_value_case: pascal

targets:
  $default:
    builders:
      json_serializable:
        options:
          # Options configure how source code is generated for every
          # `@JsonSerializable`-annotated class in the package.
          #
          # The default value for each is listed.
          any_map: false
          checked: false
          constructor: ""
          create_factory: true
          create_field_map: false
          create_to_json: true
          disallow_unrecognized_keys: false
          explicit_to_json: false
          field_rename: pascal
          generic_argument_factories: false
          ignore_unannotated: false
          include_if_null: true

感兴趣的主要领域是field_rename，它可以是下面列出的json_serializable 中的枚举FieldRename 中的任何值


/// Values for the automatic field renaming behavior for [JsonSerializable].
enum FieldRename {
  /// Use the field name without changes.
  none,

  /// Encodes a field named `kebabCase` with a JSON key `kebab-case`.
  kebab,

  /// Encodes a field named `snakeCase` with a JSON key `snake_case`.
  snake,

  /// Encodes a field named `pascalCase` with a JSON key `PascalCase`.
  pascal,

  /// Encodes a field named `screamingSnakeCase` with a JSON key
  /// `SCREAMING_SNAKE_CASE`
  screamingSnake,
}

最初，我发现这个 github 页面here 说要执行以下操作

However, when I write this, there is an error (when I checked the generated file, it was generated twice)
@freezed
@JsonSerializable(fieldRename: FieldRename.snake)
class Example with _$Example {
  factory Example() = GeneratedClass;
}
So rewriting it this way works fine.
@freezed
class Example with _$Example {
  @JsonSerializable(fieldRename: FieldRename.snake)
  factory Example() = GeneratedClass;
}

这些解决方案都没有帮助我，只有编辑 build.yaml 文件解决了这个问题。

我正在使用的版本

  #Freezed 
  freezed_annotation: ^2.1.0
 #json annotations
  json_annotation: ^4.6.0

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner: ^2.2.0
  flutter_lints: ^2.0.1
  freezed: ^2.1.0+1
  json_serializable: ^6.3.1

【讨论】：