Question

我正在使用Angular 6 w / NgRX 4.我有多个我想要合并的减速器。

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reducers，但是在Angular中，当我尝试从商店中选择时，我得到了未定义。当我尝试使用开发工具查看商店时，我看不到我的简化器和状态都只是{}

如何在Angular 6 / NgRX 4中设置多个Reducer？

Answer 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,
};

Answer 2

对我来说，这个博客帮助了： 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,
};

Angular 6 / NGRX组合减速器

2 个答案: