The combination of Firebase and AngularJS with limitToFirst(1) fails to return a specific child element

Currently, I'm working with AngularJS and Firebase and facing an issue when trying to retrieve the first child from a filtered set of children. Interestingly, using limitToFirst(1) doesn't seem to accomplish this, unlike the .child("=KDhddgd47nd") method.

Here's an example snippet of my code:

var Sport = new Firebase(FirebaseUrl);  
var Teams = Sport.child("teams");  
var myTeam = Teams.child("Saints");  
var myPlayers = myTeam.child("players").orderByChild("name");  
var myFixtures = myTeam.child("fixtures").startAt(now).orderByChild("date");

After this, I have a collection of fixtures, stored in myFixtures.

*var myFirstFixture = myFixtures.child("-KDUNN5KRNUmLlOhUB4D");*

This line successfully retrieves the fixture whose id is -KDUNN5KRNUmLlOhUB4D

However,

var myFirstFixture = myFixtures.limitToFirst(1);

does not yield the same result. In fact, it doesn't retrieve any fixture at all.

One would expect it to, wouldn't they?

javascriptangularjsfirebaseangularfire

Answer №1

It seems like you need to include a callback function according to the documentation. Why don't you give this a try and let us know how it goes?

var myFirstFixture = myFixtures.limitToFirst(1).on("child_added", function(snapshot) {
  console.log(snapshot.key() , snapshot.val());
});

Answer №2

It seems likely that you are currently utilizing:

$scope.fixture = $firebaseObject(myFirstFixture);

This method will be effective if you have a direct reference to the first fixture in your Firebase database, such as with 

myFixtures.child("-KDUNN5KRNUmLlOhUB4D")
.

However, it will not function properly if you are using a query. Queries can potentially return multiple items that meet your criteria, resulting in a list. Even if there is only one matching fixture, the query will still produce a list with one item. In this case, you will need to convert it to an array:

$scope.fixtures = $firebaseArray(myFirstFixture);

Afterwards, you can use ng-repeat to iterate over it in your HTML view.

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