Exploring the characteristics of $scope elements generated by the $resource factory service within AngularJS

I need to access attributes of an object that originates from a $resource factory service (REST API).

services.js:

myApp.factory('userService', ['$resource', 'backendUrl', function($resource, backendUrl) {
  return $resource(backendUrl + '/api/users/:region/:name',
    {region: '@region', name: '@name'}
  );
}]);

controllers.js:

$scope.userInfo = userService.get({region: $routeParams.region, name: $routeParams.name});

When I use console.log($scope.userInfo) in controllers.js, the userInfo object displays several attributes. However, I am facing difficulties accessing these attributes using dot or bracket notation.

Sample output of console.log($scope.userInfo):

Resource {$promise: Object, $resolved: false, $get: function, $save: function, $query: function…}
$promise: Object
$resolved: true
id: 185
last_update: "2014-08-13T08:56:19.546"
name: "test_user"
region: "na"

Even though I see the above output, trying to access something like $scope.userInfo.name returns undefined. I require some of this information from userInfo for creating subsequent requests to the API.

Is there something specific about this being a Resource type object that I am missing?

Answer â„–1

When using Resources' get method, it is important to remember that it is an asynchronous call. This means that you can only access properties after receiving a response from the backend.

To check if the resource has been resolved, you can use the $resolved property:

$scope.userInfo = userService.get({region: $routeParams.region, name: $routeParams.name});
console.log($scope.userInfo.$resolved)

This will always print false until the resource is resolved.

If you want to access values once they are ready, you can utilize the resource's $promise callback in two ways:

$scope.userInfo = userService.get({region: $routeParams.region, name: $routeParams.name}, function(userInfo) {
    console.log(userInfo.name);
    console.log($scope.userInfo.name); // both will print the same value
});

Alternatively, you can use the following approach:

$scope.userInfo = userService.get({region: $routeParams.region, name: $routeParams.name});
$scope.userInfo.$promise.then(function(userInfo) {
    console.log(userInfo == $scope.userInfo); // true
});

In case of error conditions, you can handle them using the resource.$promise.reject callback. For more information, visit https://docs.angularjs.org/api/ngResource/service/$resource

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