ngrx createSelector TypeError 中的错误：无法读取未定义的属性“isOpen”答案

【问题标题】：ERROR in ngrx createSelector TypeError: Cannot read property 'isOpen' of undefinedngrx createSelector TypeError 中的错误：无法读取未定义的属性“isOpen”
【发布时间】：2019-09-27 13:28:30
【问题描述】：

我正在使用 createSelector 函数

我遇到了这个我无法解决的问题，我已经到了不知道该怎么办的地步

export const getRecoveryIsOpen = createSelector(
    getRecoveryPasswordState,
    fromRecoveryPassword.getRecoveryPasswordIsOpen
)

所以我叫她

this.store.select(reducers.getRecoveryState).subscribe( isBlur => {
    console.log(isBlur)
})

Pero siempre me sale el mismo error al momento de cargar la pagina。 y en el Redux devtools estan los estados cargados Correctamente

ERROR TypeError: Cannot read property 'isOpen' of undefined
    at getRecoveryPasswordIsOpen (recovery-password.reducer.ts:65)
    at store.js:938
    at memoized (store.js:853)
    at defaultStateFn (store.js:893)
    at store.js:947
    at memoized (store.js:853)
    at MapSubscriber.project (store.js:772)
    at MapSubscriber._next (map.js:29)
    at MapSubscriber.next (Subscriber.js:49)
    at MapSubscriber._next (map.js:35)

这是我的 recovery-password.reducer

import * as RecoveryPasswordActions from '../actions/recovery-password.actions';
import { RecoveryPasswordActionTypes } from '../actions/recovery-password.actions';


export interface State {
    identificacion: number;
    error: String;
    currentStep: number;
    isOpen: boolean;
}

const initialState: State = {
    identificacion: null,
    error: "",
    currentStep: 1,
    isOpen: false
}

export function RecoveryPasswordReducer(state: State = initialState, action: RecoveryPasswordActions.actions) {

    switch (action.type) {
        case RecoveryPasswordActionTypes.OpenRecoveryPassword:
            return {
                ...state,
                isOpen: true
            }

        case RecoveryPasswordActionTypes.CloseRecoveryPassword:
            return {
                ...state,
                isOpen: false
            }

        case RecoveryPasswordActionTypes.SendIdUser:
            return {
                ...state,
                identificacion: action.payload.identificacion
            }

        case RecoveryPasswordActionTypes.SendIdUserError:
            return {
                ...state,
                error: action.payload.error
            }

        case RecoveryPasswordActionTypes.SendIdUserSuccess:
            return {
                ...state,
                currentStep: 2
            }

        case RecoveryPasswordActionTypes.SendRecoveryMethod:
            return {
                ...state,
                recoveryMethod: action.payload.recoveryMethod
            }

        default:
            return state;
    }

}

export const getRecoveryPasswordState = (state: State) => state;
export const getRecoveryPasswordIsOpen = (state: State) => state.isOpen;
export const getRecoveryPasswordCurrentStep = (state: State) => state.currentStep;
export const getRecoveryPasswordError = (state: State) => state.error;

我审查了很多，我真的没有发现任何错误，我想知道我是否做错了什么。

【问题讨论】：

您的部分问题是西班牙语，请注意这是一个英文网站

标签： angular ngrx

【解决方案1】：

export const selectIsOpen = createFeatureSelector<boolean>('isOpen'); // if you dont have any name for module AppModule or this is not Child StroreModule
export const selectPatent = createFeatureSelector<State>('Parent name'); // parent name you can find in parant Module in imports StoreModule.forFeature('Parent name', reducers)
export const export const getRecoveryIsOpen = createSelector(selectPatent, (state) => state && state.isOpen);

【讨论】：