AngularFire: Retrieve the $value

Having an issue logging the service.title to the console as it keeps returning as a strange object.

.factory('service', function($firebase, FBURL, $routeParams) {
  var ref = new Firebase(FBURL + "services/" + $routeParams.serviceId);
  var title = $firebase(ref.child('title')).$asObject();

  return {
    id: $routeParams.serviceId,
    title: title
  }
})

.controller('ServiceController', function ($scope, $firebase, service, $routeParams, FBURL) {
  $scope.service = service;

  console.log($scope.service.title);
})

When checking the console, it shows:

Trying to access that $value in the log. Is there anyone who can assist with what might be causing this issue?

Your help is appreciated!

javascriptangularjsfirebaseangularfire

Answer №1

The so-called "weird object" you mentioned is actually just an AngularFire object. This behavior is to be expected when you assign it in this manner:

var title = $firebase(ref.child('title')).$asObject();

When you use $asObject on a simple value, AngularFire stores the actual value in a $value property.

However, due to the asynchronous nature of retrieving data from Firebase servers, the value is not immediately accessible after setting up the reference and calling $asObject. Therefore, the following code will not work as intended:

var ref = new Firebase(FBURL + "services/" + $routeParams.serviceId);
var title = $firebase(ref.child('title')).$asObject();
console.log(title.$value);

Instead, you need to handle when the value becomes available, for which AngularFire provides convenient promises:

var ref = new Firebase(FBURL + "services/" + $routeParams.serviceId);
var title = $firebase(ref.child('title')).$asObject();
title.$loaded().then(function(title) {
  console.log(title.$value);
});

You only need to manage this promise if you want to manipulate the data in your own code. If your goal is simply to bind the title to an AngularJS view (which is the main purpose of AngularFire), the view will update automatically. Well, not truly automatic but it observes for similar promises to be fulfilled. In this scenario, you won't have to manually handle it in your code.

Answer №2

It is certain that this code will display the object: var title = $firebase(ref.child('title')).$asObject();

The object represents your title.

If you console.log it, the object will be printed. To access the value, use console.log($scope.service.title.$value)

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