Tips for overcoming a challenge with a promise of $q

Currently in my AngularJS project, I am utilizing $q for promises and feeling a bit overwhelmed with the usage. How can I resolve this promise-related issue?

My goal is to either return the user when isLoggedInPromise() is triggered or provide a response of "AUTH_REQUIRED".

Appreciate any help and guidance!


    function isLoggedInPromise() {
        $q.when(userWithAllData()).then(function(user) {
            return user;
        });
        $q.when(userWithAllData()).reject(function() {
            return "AUTH_REQUIRED";
        });
    }

    function userWithAllData(){
        var deferral = $q.defer();

        var query = new Parse.Query(Parse.User);
        query.include(["info", "info.rank", "privateInfo"]);
        query.get(Parse.User.current().id).then(function (loadedUser){
            deferral.resolve( loadedUser );
        });

        return deferral.promise;
    }

Answer №1

To ensure that your function returns all the necessary data, make sure to invoke the resolve function on the promise once it has collected everything.

When dealing with a function that yields a promise, consider "resolve" as the equivalent of a return statement in regular functions.

Therefore, your isLoggedInPromise function should also yield a promise, leading to a somewhat redundant setup. Anything dependent on user data will need to wait for it using then.

isLoggedInPromise().then(function(result){...etc...}, function(reason){//authentication required})

If you still require the isLoggedin Function, it should be structured like this:

function isLoggedInPromise() {
    var isLoggedIn = userWithAllData().then(
        function(user) {
            return user;
        }, 
        function(reason){
            return $q.reject("AUTH_REQUIRED")
        });    
}

Remember to implement rejection logic within the userWithAllData function too.

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