Having trouble understanding why ng-resource refuses to return an array

Question

Having trouble understanding why ng-resource refuses to return an array

I've recently encountered an issue while using AngularJS and NGResource. For some reason, every time I try to use the query function, I receive an empty array in return.

Within my controller, the code looks like this:

Task = $resource('/tasks'); 
var tasks = Task.query(function () {});
console.log(tasks);
$scope.tasks = tasks;

When I display {{tasks}} in the view, it appears correctly as below:

[{"created_at":"08/08/2013","created_by_id":2,"description":"description","id":1,"name":"test task 1","parent_task_id":null,"task_type_id":1,"updated_at":"08/08/2013"},
{"created_at":"08/08/2013","created_by_id":2,"description":"description","id":2,"name":"test task 2","task_type_id":1,"updated_at":"08/08/2013"}]

However, in the console, it shows an empty array:

[]

Furthermore, when using the batarang extension for Chrome, the scope displayed for tasks is:

tests: 
  [  ]

Before assigning the returned value to the $scope model, I need to perform some data operations on it. Is this behavior normal or am I missing something? Any insights would be greatly appreciated as I have spent quite a bit of time trying to resolve this issue.

javascript ruby-on-rails ajax angularjs angular-resource

Answer 1

Answer №1

Make sure to avoid logging the empty array prematurely, as it may not yet be filled with data from the asynchronous AJAX call.

Angular works its magic by automatically updating the tasks array with incoming data and refreshing the view accordingly.

To see this in action, give this code a try:

var Task = $resource('/tasks');

$scope.tasks = Task.query(function () {});;

$scope.$watch('tasks', function (value) {
    console.log(value);
});

Referencing the documentation, here's a relevant quote:

It's important to note that when you invoke a $resource method, you receive an empty reference initially. The actual data will only populate the reference once it is retrieved from the server. This feature is beneficial for models linked to views - an empty object prevents rendering until new data arrives, triggering automatic updates. Typically, callback functions are unnecessary in this scenario.

Answer 2

Make sure to avoid logging the empty array prematurely, as it may not yet be filled with data from the asynchronous AJAX call.

Angular works its magic by automatically updating the tasks array with incoming data and refreshing the view accordingly.

To see this in action, give this code a try:

var Task = $resource('/tasks');

$scope.tasks = Task.query(function () {});;

$scope.$watch('tasks', function (value) {
    console.log(value);
});

Referencing the documentation, here's a relevant quote:

It's important to note that when you invoke a $resource method, you receive an empty reference initially. The actual data will only populate the reference once it is retrieved from the server. This feature is beneficial for models linked to views - an empty object prevents rendering until new data arrives, triggering automatic updates. Typically, callback functions are unnecessary in this scenario.

Having trouble understanding why ng-resource refuses to return an array

Answer №1

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