Angular2 In Memory Web API

Remarks#

I mainly requested this topic because I could not find any information on setting up multiple API routes with the Angular2-In-Memory-Web-Api. Ended up figuring it out myself, and figured this might be helpful to others.

Basic Setup

mock-data.ts

Create the mock api data

export class MockData {
  createDb() {
    let mock = [
      { id: '1', name: 'Object A' },
      { id: '2', name: 'Object B' },
      { id: '3', name: 'Object C' },
      { id: '4', name: 'Object D' }
    ];
    
    return {mock};
  }
}

main.ts

Have the dependency injector provide the InMemoryBackendService for XHRBackend requests. Also, provide a class that includes a

createDb()

function (in this case, MockData) specifying the mocked API routes for SEED_DATA requests.

import { XHRBackend, HTTP_PROVIDERS } from '@angular/http';
import { InMemoryBackendService, SEED_DATA } from 'angular2-in-memory-web-api';
import { MockData } from './mock-data';
import { bootstrap } from '@angular/platform-browser-dynamic';

import { AppComponent } from './app.component';

bootstrap(AppComponent, [
    HTTP_PROVIDERS,
    { provide: XHRBackend, useClass: InMemoryBackendService },
    { provide: SEED_DATA,  useClass: MockData }
]);

mock.service.ts

Example of calling a get request for the created API route

import { Injectable }     from '@angular/core';
import { Http, Response } from '@angular/http';
import { Mock } from './mock';

@Injectable()
export class MockService {
  // URL to web api
  private mockUrl = 'app/mock';

  constructor (private http: Http) {}

  getData(): Promise<Mock[]> {
    return this.http.get(this.mockUrl)
                    .toPromise()
                    .then(this.extractData)
                    .catch(this.handleError);
  }

  private extractData(res: Response) {
    let body = res.json();
    return body.data || { };
  }

  private handleError (error: any) {
    let errMsg = (error.message) ? error.message :
      error.status ? `${error.status} - ${error.statusText}` : 'Server error';
    console.error(errMsg);
    return Promise.reject(errMsg);
  }
}

Setting Up Multiple Test API Routes

mock-data.ts

export class MockData {
    createDb() {
        let mock = [
            { id: '1', name: 'Object A' },
            { id: '2', name: 'Object B' },
            { id: '3', name: 'Object C' }
        ];
        
        let data = [
            { id: '1', name: 'Data A' },
            { id: '2', name: 'Data B' },
            { id: '3', name: 'Data C' }
        ];

        return { mock, data };
    }
}

Now, you can interact with both

app/mock

and

app/data

to extract their corresponding data.