Retrieve object from Parse with Swift

Question

I'm developing a simple iOS application. It's a simple quiz app. I'm using Parse to store my questions, answers etc. I've read all the documentation and cannot find why this code to retrieve an object is not working.

var query = PFQuery(className: "Test_Questions")
query.getObjectInBackgroundWithId("cJzv2JdMej", block: {
    (questionObject: PFObject?, error: NSError?) -> Void in

    let thisQuestion = questionObject["question"] as! String
    //Error here: AnyObject is not convertible to String

})

Your help would be much appreciated!

Console Output:

Optional(What statement must come before an else statement?)

try printing questionObject and error (println("Object: (questionObject) - Error: (error)")) — Dante Puglisi
– Dante Puglisi, Commented Jul 27, 2015 at 14:30

pbush25 · Accepted Answer · 2015-07-27 14:32:32Z

1

You should try this instead:

var query = PFQuery(className: "Test_Questions")
query.getObjectInBackgroundWithId("cJzv2JdMej", block: {
(questionObject: PFObject?, error: NSError?) -> Void in
    if error == nil {
        println(questionObject)
        //if there's info in the console you know the object was retrieved
        let thisQuestion = questionObject["question"] as? String

    } else {
        println("Error occurred retrieving object")
    }
})

If that doesn't work you can also try let thisQuestion = questionObject.valueForKey("question"). Also make sure that Parse is actually returning an object by adding a print statement such as println(questionObject) after it has been retrieved so that you know Parse is returning an object.

edited Jul 27, 2015 at 14:32

answered Jul 27, 2015 at 14:29

pbush25

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16 Comments

Dante Puglisi Over a year ago

You should add the else statement in case error != nil printing the error returned

pbush25 Over a year ago

You're right I added the check for error they didn't originally have but I was being lazy by not adding the else check, thanks.

Dante Puglisi Over a year ago

1 more thing, it should be: println("Error occurred retrieving object, error: (error)")

pbush25 Over a year ago

Well that's just symantics and debugging preferences at that point, but yes that would be helpful.

Gavin Friel Over a year ago

Ok so now I have a UI Label like so: @IBOutlet weak var question: UILabel! how do I append this to output the question using that? I still get the AnyObject String error.

|

Gavin Friel · Accepted Answer · 2015-07-27 16:35:45Z

0

Got it!

var query = PFQuery(className: "Test_Questions")
    query.getObjectInBackgroundWithId("cJzv2JdMej", block: {
        (questionObject: PFObject?, error: NSError?) -> Void in

        let thisQuestion: AnyObject! = questionObject!.valueForKey("question")

        self.question.text = thisQuestion as? String

        })

answered Jul 27, 2015 at 16:35

Gavin Friel

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