gistfile1.js

function UserFactory($http) {
  var factory = {};
  var users = {};

  factory.load = function load() {
    // Return promise returned by $http.get
    return $http.get('http://localhost:3000/users')
      .success(function(data) {
        angular.forEach(data, function(item, index) {
          users[data.id] = data;
        });
      })
      .error(function(error, status) {
        alert(error);
      });
  };

  factory.getUsers = function getUsers() {
    return users;
  };

  factory.getUser = function getUser(id) {
    return users[id];
  };
  
  return factory;
}
angular.module('User').factory('UserFactory', UserFactory);

gistfile2.js

angular.module('User').config(['$routeProvider',
  function($routeProvider) {
    $routeProvider.
      when('/users', {
        templateUrl: 'partials/users/list.html',
        controller: 'UserListController',
        resolve: function(UserFactory) {
          // Resolve will wait for promise returned by load to resolve before loading page
          return UserFactory.load()
        }
      })
      .when('/users/:id', {
        templateUrl: 'partials/users/show.html',
        controller: 'UserShowController',
        resolve: function(UserFactory) {
          // Resolve will wait for promise returned by load to resolve before loading page
          return UserFactory.load()
        }
      })
  }
]);