How can I prevent the angularFire $add(user) method from duplicating records? Is there a way to ensure that firebase records remain unique?

I need help preventing duplicate records in AngularFire when adding users to my database. How can I ensure that a user is only added once, without creating duplicates?

Here is an example of the button I am using:

<a class="btn btn-block btn-lg btn-success" href="#" ng-hide="auth.user" ng-click="auth.$login('persona')"><span><i class="fa fa-user fa-lg"></i></span>&nbsp;&nbsp;Login with <strong>Persona</strong></a>

My controller code includes:

var ref = new Firebase("https://mybase.firebaseio.com/");
                        $scope.auth = $firebaseSimpleLogin(ref);

var users = new Firebase("https://mybase.firebaseio.com/users");
                        $scope.uData = $firebase(users);

$scope.auth.$login('persona').then(function(user){

                             var usersArray = orderByPriorityFilter($scope.uData);

                             if (_.contains((_.pluck(usersArray, 'uid')),user.uid) == false){$scope.uData.$add(user)}


                         });

The login and redirect controllers handle user data separately, but when trying to add user data before redirection, duplicate entries are created in the database.

Any advice on addressing this issue would be greatly appreciated!

javascriptangularjsfirebaseangularfire

Answer №1

When working with the $add method, it is important to note that it should only be used for creating and appending new records with a chronologically incremental ID. If you need to overwrite existing records or create new ones if they are not already present, then consider using either the $save or $set method.

$scope.auth.$login('persona').then(function(user){
  var usersArray = orderByPriorityFilter($scope.uData);
  if (_.contains((_.pluck(usersArray, 'uid')),user.uid) == false){
    $scope.uData.$child(user.uid).$set(user);
  }
});

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