TypeError: object is not a function - fetching collection data from server using rails

TypeError: object is not a function - fetching collection data from server
using rails

ok this is the last question from todays trilogy of learning Angular:
part1
part2
I am getting to following error:
TypeError: object is not a function
at Object.source (http://localhost:3000/assets/angular.js?body=1:6300:13)
at getMatchesAsync
(http://localhost:3000/assets/angular-ui-bootstrap.js?body=1:1820:30)
at http://localhost:3000/assets/angular-ui-bootstrap.js?body=1:1871:13
at http://localhost:3000/assets/angular.js?body=1:12030:15
at Array.forEach (native)
at forEach (http://localhost:3000/assets/angular.js?body=1:134:11)
at $setViewValue (http://localhost:3000/assets/angular.js?body=1:12029:5)
at http://localhost:3000/assets/angular.js?body=1:11423:14
at Object.Scope.$eval
(http://localhost:3000/assets/angular.js?body=1:7994:28)
at Object.Scope.$apply
(http://localhost:3000/assets/angular.js?body=1:8074:23)
angular.js?body=1:5688
(anonymous function) angular.js?body=1:5688
(anonymous function) angular.js?body=1:4785
Scope.$apply angular.js?body=1:8076
listener angular.js?body=1:11422
jQuery.event.dispatch jquery.js?body=1:5096
elemData.handle
with this code (updated according to the SO answers:
<div ng-app='users'>
<div class='container-fluid' ng-controller="UsersIndexCtrl">
<pre>Model: {{result | json}}</pre>
<input type="text" ng-model="result" typeahead="suggestion for
suggestion in users($viewValue)">
</div>
<script>
var app = angular.module('users', ['ui.bootstrap', 'ngResource']);
app.factory('User', function($resource) {
return $resource("users/:id", { id: '@id' }, {
index: { method: 'GET', isArray: true, responseType: 'json' },
show: { method: 'GET', responseType: 'json' },
update: { method: 'PUT', responseType: 'json' }
});
})
var UsersIndexCtrl = function($scope, User) {
$scope.users = User.index();
};
</script>
I am trying to fetch all users from the server using typeahead.
Latest version of plunker code is here
Questions: 1. How to fetch collection data from server and make typeahead
running using angular and modifying this code ?. 2. What does this error
means and how it is causes in connection to this code.