customers.service.ts

@Injectable()
export class CustomersService {

  constructor(
    private http: Http) { }

  getAll() {
    return this.http.get('api/customers')
      .subscribe(customers => {
        console.log(customers)
      })
  }
  
  get(id) {
    return this.http.get(`api/customers/${id}`)
      .subscribe(customer => {
        console.log(customer)
      })
  }
}