2017-10-17 81 views
0

沒有數據,我下面的教程角步驟7 hereAngular.io教程HeroService負荷InMemoryDataService

HeroService調用getHeroes()返回時,沒有英雄。但我認爲它應該返回in-memory-data.service.ts中定義的模擬數據。應該如何糾正它?

我沒有找到解決方案,

  • 試圖改變heroesUrlapp/heroes
  • 試圖通過npm install angular-in-memory-web-api --save重裝angular-in-memory-web-api(當前安裝的版本"angular-in-memory-web-api": "^0.5.0"

我的代碼如下:
app.module.ts

import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { FormsModule} from '@angular/forms'; 
import { HttpModule } from '@angular/http'; 

import { AppRoutingModule } from './app-routing.module'; 

// Imports for loading & configuring the in-memory web api 
import { InMemoryWebApiModule } from 'angular-in-memory-web-api'; 
import { InMemoryDataService } from './in-memory-data.service'; 

import { AppComponent } from './app.component'; 
import { HeroDetailComponent} from './hero-detail.component'; 
import { HeroesComponent } from './heroes.component'; 
import { DashboardComponent } from './dashboard.component'; 
import { HeroService } from './hero.service'; 

@NgModule({ 
    declarations: [ 
    AppComponent, 
    HeroDetailComponent, 
    HeroesComponent, 
    DashboardComponent 
    ], 
    imports: [ 
    BrowserModule, 
    FormsModule, 
    HttpModule, 
    InMemoryWebApiModule.forRoot(InMemoryDataService), 
    AppRoutingModule 
    ], 
    providers: [HeroService], 
    bootstrap: [AppComponent] 
}) 
export class AppModule { } 

內存,data.service.ts

import { InMemoryDbService } from 'angular-in-memory-web-api'; 
export class InMemoryDataService implements InMemoryDbService { 
    createDb() { 
    const heroes = [ 
     { id: 0, name: 'Zero' }, 
     { id: 11, name: 'Mr. Nice' }, 
     { id: 12, name: 'Narco' }, 
     { id: 13, name: 'Bombasto' }, 
     { id: 14, name: 'Celeritas' }, 
     { id: 15, name: 'Magneta' }, 
     { id: 16, name: 'RubberMan' }, 
     { id: 17, name: 'Dynama' }, 
     { id: 18, name: 'Dr IQ' }, 
     { id: 19, name: 'Magma' }, 
     { id: 20, name: 'Tornado' } 
    ]; 
    return {heroes}; 
    } 
} 

hero.service.ts

import { Injectable } from '@angular/core'; 
import { Headers, Http } from '@angular/http'; 
import { Hero } from './hero'; 

import 'rxjs/add/operator/toPromise'; 

@Injectable() 
export class HeroService { 
    private heroesUrl = 'api/heroes'; 

    constructor(private http: Http) {} 
    getHeroes(): Promise<Hero[]> { 
     console.log('in getheroes'); 
     return this.http.get(this.heroesUrl) 
        .toPromise() 
        .then(response => response.json().data as Hero[]) 
        .catch(this.handleError); 
    } 

    private handleError(error: any): Promise<any> { 
     console.error('An error occurred', error); 
     return Promise.reject(error.message || error); 
    } 

    getHero(id: number): Promise<Hero> { 
     return this.getHeroes().then(heroes => heroes.find(hero => hero.id === id)); 
    } 
} 

更新
問題根據@federico scamuzzi的建議解決。
更改.then(response => response.json().data as Hero[]).then(response => response.json() as Hero[])修復它。

+0

顯示你的代碼。 –

+0

@federicoscamuzzi感謝您的快速響應,抱歉,編輯器在我試圖將我的代碼作爲圖片上傳時,打擾了我很多,所以最終更改爲文本格式。但是代碼屏幕截圖仍然可以在這裏找到:[2]:https://i.stack.imgur.com/uMleS.png [3]:https://i.stack.imgur.com/P0HY0.png [4] :https://i.stack.imgur.com/qGN8l.png – vancexu

+1

嗨..你有沒有嘗試不使用.data?例如.then(response => response.json()as Hero [])或您使用的是哪個版本的Angular?在最新版本中,http提供程序在Httpclient –

回答

0

您是否嘗試過don't use .data? ..所以例如:

.then(response => response.json() as Hero[])

PS - >被仔細的角的wihich版本您使用的...在最新版本的HTTP提供在HttpClient的改變