如何使用Freezed从父类继承

Question

我对颤音很陌生(对冷冻包来说更是如此.)因此，我希望这个问题是相关的。

下面是我的usecase:用户可以是不同组的成员。用户类共享。我有问题要处理与冷冻剂的关系：

@freezed
abstract class User with _$User {
  const factory User({
    @required UniqueId id,
    Name firstname,
    Name lastname,
    @required EmailAddress email,
    @required bool emailVerified,
  }) = _User;
}

@freezed
abstract class Member extends User with _$Member { // Here is the issue
  const factory Member({
    @required UniqueId id,
    @required Name displayname,
    String photo,
    List roles,
    String status,
    DateTime expiration,
  }) = _Member;

_$Member.copyWith‘('$MemberCopyWith函数()’)不是'_$User.copyWith‘('$UserCopyWith函数()’)的有效覆盖。

怎样才是正确的方法？

Answer 1

您必须使用Implements标记并使User成为一个正常的抽象类。但考虑到你的情况，我认为最好做以下几件事。

abstract class UserBase {
  UniqueId get id;
  Name get firstname;
  Name get lastname;
  EmailAddress get email;
  bool get emailVerified;
}

@freezed
abstract class User with _$User {
  @Implements(UserBase)
  const factory User({
    @required UniqueId id,
    Name firstname,
    Name lastname,
    @required EmailAddress email,
    @required bool emailVerified,
  }) = _User;
}

@freezed
abstract class Member with _$Member {
  @Implements(UserBase)
  const factory Member({
    @required UniqueId id,
    Name firstname,
    Name lastname,
    @required EmailAddress email,
    @required bool emailVerified,
    @required Name displayname,
    String photo,
    List roles,
    String status,
    DateTime expiration,
  }) = _Member;
}

请随时询问任何问题。