Error retrieving data from the ngresource properties resource

In the code snippet below, I have a simple factory that requests a json object containing location information. The requests are successful and the data is present in the object. However, there seems to be a scope problem as I am unable to access the properties of the locations object, even though I know that the object has the property and the correct array.

As indicated by the comments in the code snippet, I am facing an issue where I cannot access some values of the object when trying to output to the console.

Do you have any insights on what might be causing this problem?

    .factory('Spots', function(){
        return{
            all: function($resource){
                var locations;
                var Locations =  $resource('http://localhost\\:3000/locationsd/');
                locations = Locations.get(function(){
                    console.log(locations.results[0].obj.name); // THIS WORKS -> gives me the name of the location
                });
                console.log(locations); // THIS WORKS -> log an object with a result array, etc.
                console.log(locations.results[0].obj.name); // THIS DOESNT WORK -> TypeError: Cannot read property '0' of undefined
                return locations;
            }
        }
    })

Answer №1

One reason for this behavior is the asynchronous nature of the process. To effectively use $resource within a service, it's recommended to utilize promises.

.factory('Spots', function(){
        return{
            all: function($resource){
                var Locations =  $resource('http://localhost\\:3000/locationsd/');
                return Locations.get().$promise.then(function(res){
                    return res;
                });
            }
        }
    })

When invoking the function from your controller:

Spots.all().then(function(res){ 
   //perform actions with res here 
})

If you're unfamiliar with promises, you can learn more about them at: https://docs.angularjs.org/api/ng/service/$q

The basic concept is that the resource promises to complete eventually and once done, it will execute the function provided in its then() method.

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