Everything in Firebase is a URL.

Take the following URL for example.

https://myapp.firebaseio.com/users/

Let's say we want to create a user with a key of 1 as a child at this location. Our URL would look like this.

https://myapp.firebaseio.com/users/1

To create a user using AngularFire we can create a reference at the users node and call $child(1) to create a reference to that location.

var usersRef = new Firebase('https://myapp.firebaseio.com/users');

var userRef = new Firebase('https://myapp.firebaseio.com/user/1');



$scope.users = $firebase(usersRef);



// these are the same

$scope.userOne = $firebase(userRef);

$scope.userOne = $scope.users.$child(1);

Then we can use $set to store the value of the user at that location.

var usersRef = new Firebase('https://myapp.firebaseio.com/users');

$scope.users = $firebase(usersRef);

$scope.users.$child(1).set({

  first: 'Vincent',

  last: 'Van Gough',

  ears: 1

});

In your case it would be:

var uniqueId = {

    id: 1,

    name: "a name",

    location: "new york"

};

$scope.myItems.$child(uniqueId.id).$set(uniqueId);

Remember that using $set will destroy any previous data at that location. To non-destructively update the values use $update.