Angular 6 / NGRX 组合减速器答案

【问题标题】：Angular 6 / NGRX Combine ReducersAngular 6 / NGRX 组合减速器
【发布时间】：2021-01-11 22:08:45
【问题描述】：

我正在使用带有 NgRX 4 的 Angular 6。我想组合多个减速器。

app.module.ts

  import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';

    import { StoreModule } from '@ngrx/store';
    import { EffectsModule } from '@ngrx/effects';

    import { StoreDevtoolsModule } from '@ngrx/store-devtools';

    import { AppComponent } from './app.component';
    import counterEffects from './store/counter/counter.effects';

    import reducers from './store/reducers';

    @NgModule({
      declarations: [AppComponent],
      imports: [
        BrowserModule,
        StoreModule.forRoot(reducers),
        EffectsModule.forRoot([counterEffects]),
        StoreDevtoolsModule.instrument({
          maxAge: 10,
        }),
      ],
      providers: [],
      bootstrap: [AppComponent],
    })
    export class AppModule {}

reducers.ts

import { combineReducers } from '@ngrx/store';
import { reducer as counterReducer, key as counterKey } from './counter';
import { reducer as profileReducer, key as profileKey } from './profile';

const appReducer = combineReducers({
  [counterKey]: counterReducer,
  [profileKey]: profileReducer,
});

export default (state, action) => {
  if (action.type === 'REDIRECT_TO_EXTERNAL') {
    state = undefined;
  }

  return appReducer(state, action);
};

我的减速器是标准的减速器，没什么特别的。

来自 React / Redux 背景，我会像这样设置多个减速器，但是在 Angular 中，当我尝试从商店中选择时，我得到了未定义的结果。当我尝试使用开发工具查看商店时，我看不到我的任何减速器，状态只是{}

如何在 Angular 6 / NgRX 4 中设置多个减速器？

【问题讨论】：

标签： angular redux ngrx

【解决方案1】：

import { ActionReducerMap } from '@ngrx/store';
import { reducer as counterReducer, key as counterKey } from './counter';
import { reducer as profileReducer, key as profileKey } from './profile';

export interface IAppState {
  [counterKey]: any;
  [profileKey]: any;
}

export const reducers: ActionReducerMap<IAppState> = {
  [counterKey]: counterReducer,
  [profileKey]: profileReducer,
};

【讨论】：

可以嵌套ActionReducerMap吗？假设我希望减速器成为其他更大减速器的一部分，该怎么做？
可以按照@UdiMazor 的要求做吗？

【解决方案2】：

对我来说，这个博客有帮助： https://blog.strongbrew.io/combinereducers-enhanced/

试试这个：

export interface IAppState {
  [counterKey]: NestedType;
  [profileKey]: any;
}

export interface NestedType {
      [nestedKey1]: any;
      [nestedKey2]: any;
    }

export const reducers: ActionReducerMap<IAppState> = {
  [counterKey]: combineReducers({
      [nestedKey1]: nestedKey1Reducer;
      [nestedKey2]: nestedKey2Reducer;
  }),
  [profileKey]: profileReducer,
};

【讨论】：