如何解决@选择嵌套对象和状态不变
我使用NGXS一段时间,发现如果在@Select return中使用对象或数组,则可能破坏组件中对象的不变性。
示例:
state: AppStateModel = {
justValue: true,complexObject: { a:1,b:2}
}
,然后是两个选择器:
// Here in a component we will get access to object by link and can modify it in state without patchState or setState
@Selector()
static getComplexObject(state: AppStateModel) {
return state.complexObject;
}
// That will work fine since JS will return it as a value (simple types) not a link
@Selector()
static getJustValue(state: AppStateModel) {
return state.justValue;
}
我看到了解决方案,例如:
// Here we can apply Deepcopy method to decople object from the state,and keep immutability no matter what happens in the components
@Selector()
static getComplexObject(state: AppStateModel) {
return clone(state.complexObject);
}
谢谢!
解决方法
例如,您可以在开发人员模式下使用Object.freeze()
https://medium.com/ngxs/immutable-state-in-ngxs-part-i-ba318bfc5bb3
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