Error: Collection not found , while using in-memory-web-api

import { InMemoryDbService } from 'angular-in-memory-web-api';

import { IProduct } from './product';
import {IInfo} from '../Informations/Model/info'

export class ProductData implements InMemoryDbService{

createDb() {

 let infos : IInfo[] = [

 {   "id":1,
    "Name": "Some Name",
   "Surname": "Bla Bla bla",
   "Country": "Austria",     
  "otherInfo":['24','Wien']

},
   {
   "id":2,
  "Name": "Another Name",
    "Surname": "Nla bla",
    "Country": "Norway",
    "otherInfo":['24','Trondheim']

  }


];


 let products: IProduct[] = [
       {              
               'id':1,
             'productName': 'IPAD',
             'productCode': 'GDN-0011',
             'releaseDate': 'March 19, 2016',
             'description': 'Easy Use',
             'price': 1945.95,
             'starRating': 4.2,
            'imageUrl': '',

         },
         {
             'id': 2,
             'productName': 'Mac Book',
             'productCode': 'GDN-0023',
             'releaseDate': 'March 18, 2016',
            'description': 'Excellent',
           'price': 1632.99,
            'starRating': 4.8,
            'imageUrl': ''
        }
    ];
     return { products,infos};
  }
}

Now you can use the url in your services like api/infos or api/products

One thing i want to highlight in this problem, In case if you are using 'in-memory web API' and if you try to call live running API or you try to call any JSOn file data located in Asset folder you will get the error in console log that particular collection not found. The reason is that 'In -memory-web-Api' will mock your json call or web API call and angular will look in 'in-memory' class which is createDB and eventually it will not get that collection. I would advise you to rather than using 'in memory Web API' , please use collection of JSON file and comment all the In memory Web API reference. It will work fine.