Flutter

Question

我很难理解如何将包用于基本案例，例如描述 API requests/responses。我可能陷入了一个循环，在这个循环中我想到了一些事情，我正试图不惜一切代价让它以这种方式工作，但我看不到更简单的解决方案。

示例：

@freezed
abstract class BaseRequest with _$BaseRequest {
  const factory BaseRequest({
    @required int a,
    @required String b,
  }) = _BaseRequest;
}

@freezed
abstract class BaseResponse with _$BaseResponse {
  const factory BaseResponse({
    @required bool c,
  }) = _BaseResponse;
}

然后

@freezed
abstract class Authentication with _$Authentication {
  @Implements(BaseRequest)
  const factory Authentication.request({
    @required int a,
    @required String b,
    @required String psw,
  }) = _AuthenticationRequest;

  @Implements(BaseResponse)
  const factory Authentication.response({
    @required bool c,
    @required String token,
  }) = _AuthenticationResponse;

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

那里有些东西很臭，我确定我遗漏了一些东西而且我无法正确组合这些东西类。在这种情况下，冻结甚至可能是矫枉过正？

Answer 1

你不能implement/extend冻结类。

要么将您的 BaseResponse/BaseRequest 更改为：

abstract class BaseRequest {
  int get a;
  String get b;
}

abstract class BaseResponse{
  bool get c;
}

或者使用组合而不是继承：

@freezed
abstract class Authentication with _$Authentication {
  const factory Authentication.request({
    @required BaseRequest request,
    @required String psw,
  }) = _AuthenticationRequest;

  const factory Authentication.response({
    @required BaseResponse response,
    @required String token,
  }) = _AuthenticationResponse;
}

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