我目前正在关注resocoders clean architecture,他在其中强烈建议将Equatable用于将在未来进行比较的基本数据持有类。问题是我的类看起来像这样:
class Person extends Equatable {
final String name;
final List<AlterEgo> alterEgos;
Person({@required name, @required alterEgos}):super([name, alterEgos]);
@override
List<Object> get props => [name, alterEgos];
}
class AlterEgo extends Equatable {
final String name;
final String superPower;
AlterEgo({@required name, @required superPower}):super([name, superPower]);
@override
List<Object> get props => [name, superPower];
}
void main(){
Person("Clark", <AlterEgo>[AlterEgo("Superman", "Flying")]) == Person("Clark", <AlterEgo>[AlterEgo("Superman", "Flying")]) //true
}问题是,当我编写构造函数时,IDE会抱怨列表是不可比较的。我有点迷茫,不知道现在应该定义哪些函数/类,才能获得一个由原始类型组成的对象列表,以便使用equatable。这个包的文档似乎也忽略了这个用例,只声明Equatable只适用于不可变类型。然而,我一点也不介意列表是不变的。
编辑:已完成示例。现在在手机上,不能马上测试。
发布于 2020-08-09 03:51:55
好吧,我的错误一定是在其他地方,在正确的MWE中使用列表似乎根本不是问题:
import 'package:equatable/equatable.dart';
import 'package:meta/meta.dart';
class Person extends Equatable {
final String name;
final List<AlterEgo> alterEgos;
Person({@required this.name, @required this.alterEgos});
@override
List<Object> get props => [name, alterEgos];
}
class AlterEgo extends Equatable {
final String name;
final String superPower;
AlterEgo({@required this.name, @required this.superPower});
@override
List<Object> get props => [name, superPower];
}
void main() {
print(Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
AlterEgo(name: "Spiderman", superPower: "Climbing"),
]) ==
Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
AlterEgo(name: "Spiderman", superPower: "Climbing"),
]));
print(Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
AlterEgo(name: "Spiderman", superPower: "Climbing"),
]) ==
Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
]));
print(Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
AlterEgo(name: "Spiderman", superPower: "Climbing"),
]) ==
Person(name: "Clark", alterEgos: <AlterEgo>[
AlterEgo(name: "Superman", superPower: "Flying"),
AlterEgo(name: "Spiderman", superPower: "Jumping"),
]));
}结果与预期一致:
true
false
falsehttps://stackoverflow.com/questions/63319085
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