active: function() {
        if (App.selectedCoreController.content) {
            Ember.RSVP.Promise.cast(Ember.$.getJSON('/ALL/' + App.selectedCoreController.content))
                .then(undefined, function() {
                    return null;
                })
                .then(function(response) {
                    App.FieldsController.fields = response.fields.map(function(d) {
                        return d.name;
                    });
                });
            console.log(App.FieldsController.fields);
            return App.FieldsController.fields;
        } else {
            return null;
        }
    }.property("App.selectedCoreController.content").cacheable()