portainer/app/azure/services/locationService.js

import { LocationViewModel } from '../models/location';

angular.module('portainer.azure')
.factory('LocationService', ['$q', 'Location', function LocationServiceFactory($q, Location) {
  'use strict';
  var service = {};

  service.locations = function(subscriptionId) {
    var deferred = $q.defer();

    Location.query({ subscriptionId: subscriptionId }).$promise
    .then(function success(data) {
      var locations = data.value.map(function (item) {
        return new LocationViewModel(item);
      });
      deferred.resolve(locations);
    })
    .catch(function error(err) {
      deferred.reject({ msg: 'Unable to retrieve locations', err: err });
    });

    return deferred.promise;
  };

  return service;
}]);