javascript - Angular 与 ngrx - 没有发生任何事情

Question

我有问题。目前我从头开始学习 NgRx。我创建 Angular 项目，添加新的汽车组件。接下来添加 ngrx 状态、操作、reducer 和效果。当我运行我的项目时，虽然设置了错误的 API url，但没有出现任何错误，当我设置正确的 url 时，仍然没有发生。

当我将控制台日志添加到 reducer 时，我在控制台中看到了这一点。但是当我将控制台日志添加到 car.effects.ts 并显示消息 true 时，然后不显示。

我的应用程序代码: reducer

import { Action } from '@ngrx/store';
import * as CarActions from './car.actions';
import { Car } from 'src/models/car.model';

const initialState: Car = {
   brand: '',
   model: ''
};

export function carReducer(state: Car[] = [initialState], action: CarActions.Actions) {

    switch (action.type) {
        case CarActions.ADD_CAR:
            return [...state, action.payload];
        case CarActions.ADD_CAR_FAIL:
            return {
                ...state,
                carError: action.payload,
            };
        default:
            return state;
    }
}

状态

import { Car } from './../../models/car.model';

export interface AppState {
  readonly car: Car;
}

行动

import { Action } from '@ngrx/store';
import { Car } from './../../models/car.model';

export const ADD_CAR       = '[CAR] Add';
export const ADD_CAR_FAIL    = '[CAR] Fail';

export class AddCar implements Action {
    readonly type = ADD_CAR;

    constructor(public payload: Car) {}
}

export class AddCarFail implements Action {
    readonly type = ADD_CAR_FAIL;

    constructor(public payload: string) {}
}

export type Actions = AddCar | AddCarFail;

效果

import { Actions, Effect, ofType } from '@ngrx/effects';
import * as CarActions from './car.actions';
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { switchMap, catchError, map, tap } from 'rxjs/operators';
import { of } from 'rxjs';

@Injectable()
export class CarEffects {
    @Effect()
    carAdd = this.actions$.pipe(
        ofType(CarActions.ADD_CAR),
        switchMap((carData: CarActions.AddCar) => {
            console.log('true');
            return this.http.post('http://myapi.com/api', { brand: carData.payload.brand, model: carData.payload.model }).pipe(map(resData => {
                localStorage.setItem('test', 'asdasdasd');
            }),
                catchError(errorRes => {
                    console.log(errorRes);
                    const errorMessage = 'An unknown error occurred!';
                    if (!errorRes.error || !errorRes.error.error) {
                        return of(new CarActions.AddCarFail(errorMessage));
                    }

                    console.log(errorRes.error.error.message);
                    return of(new CarActions.AddCarFail(errorRes.error.error.message));
                }));
        })
    );

    constructor(
        private actions$: Actions,
        private http: HttpClient) { }
}

App.Module.ts

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

import { AppComponent } from './app.component';
import { CarComponent } from './car/car.component';
import { StoreModule } from '@ngrx/store';
import { carReducer } from './car/car.reducer';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
  declarations: [
    AppComponent,
    CarComponent
  ],
  imports: [
    BrowserModule,
    StoreModule.forRoot({car: carReducer}),
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

我安装了 store-devtools 并在控制台中安装了:

ERROR in node_modules/@ngrx/store-devtools/src/config.d.ts(2,10): error TS2305: Module '"C:/Users/Sebastian/Documents/ngrx-angular/node_modules/@angular/core/core"' has no exported member 'OpaqueToken'.
node_modules/@ngrx/store-devtools/src/devtools.d.ts(1,10): error TS2305: Module '"C:/Users/Sebastian/Documents/ngrx-angular/node_modules/@ngrx/store/store"' has no exported member 'Dispatcher'.
node_modules/@ngrx/store-devtools/src/devtools.d.ts(1,22): error TS2305: Module '"C:/Users/Sebastian/Documents/ngrx-angular/node_modules/@ngrx/store/store"' has no exported member 'Reducer'.
node_modules/@ngrx/store-devtools/src/extension.d.ts(1,10): error TS2305: Module '"C:/Users/Sebastian/Documents/ngrx-angular/node_modules/@angular/core/core"' has no exported member 'OpaqueToken'.
node_modules/@ngrx/store-devtools/src/instrument.d.ts(2,10): error TS2305: Module '"C:/Users/Sebastian/Documents/ngrx-angular/node_modules/@ngrx/store/store"' has no exported member 'Reducer'.

Answer 1

我做了一些小修改。您使用的版本错误

{
  "name": "ngrx-angular",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~7.2.0",
    "@angular/common": "~7.2.0",
    "@angular/compiler": "~7.2.0",
    "@angular/core": "~7.2.0",
    "@angular/forms": "~7.2.0",
    "@angular/platform-browser": "~7.2.0",
    "@angular/platform-browser-dynamic": "~7.2.0",
    "@angular/router": "~7.2.0",
    "@ngrx/effects": "^7.4.0",
    "@ngrx/store": "^7.4.0",
    "@ngrx/store-devtools": "^7.4.0",
    "core-js": "^2.5.4",
    "rxjs": "~6.3.3",
    "rxjs-compat": "^6.5.2",
    "save": "^2.4.0",
    "tslib": "^1.9.0",
    "zone.js": "~0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.13.0",
    "@angular/cli": "~7.3.8",
    "@angular/compiler-cli": "~7.2.0",
    "@angular/language-service": "~7.2.0",
    "@types/node": "~8.9.4",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "~3.2.2"
  }
}

也在这里更改

  imports: [
    BrowserModule,
    StoreModule.forRoot({ car: carReducer }),
    HttpClientModule,
    StoreDevtoolsModule.instrument({
      maxAge: 5
    })
  ],

结果

公关here