Populating an array using Parse queries (Swift)

Question

I am trying to populate an array with a query from my parse database. When I try to print out the content of the array, I get an EXC_BAD_INSTRUCTION error. It doesn't seem like I'm properly appending new elements into my array, I'd appreciate any sort of tips

func loadSampleTasks() {

    tasks = [Task]()
    let query = PFQuery(className: "Task")
    query.whereKey("TaskName", equalTo: "kenny")
    query.findObjectsInBackgroundWithBlock() {
        (objects: [PFObject]?, error: NSError?) -> Void in
        if error == nil && objects != nil {
            self.parseResults(objects!)
            print(self.tasks) // this prints out Kenny object as expected
        }
    }
    print(tasks) // prints an empty array
}

func parseResults(objects: Array<PFObject>){

    for object in objects { //looping through returned data
        print("no error in Parse lookup")
        let parseResult1 = Task(name: object["TaskName"] as! String)
        parseResult1?.completed = object["Completed"] as! Bool
        print("Parse result in object loop: \(parseResult1!.name)")
        tasks.append(parseResult1!)
    }

}

Any help much appreciated!

This is happening because you're getting your parse results in a closure, which means it may execute after the function itself has already returned. — Fred Faust
– Fred Faust, Commented Dec 4, 2015 at 16:44

Collin O. · Accepted Answer · 2015-12-04 17:06:57Z

1

To what thefredelement said, "This is happening because you're getting your parse results in a closure, which means it may execute after the function itself has already returned." Before this happens, though, it won't work properly and you'll come back with that error.

answered Dec 4, 2015 at 17:06

Collin O.

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2 Comments

Kenny Tao Over a year ago

I don't quite understand why there would be an error. It seems like I'm calling print after the closure so it should be fine?

Collin O. Over a year ago

Ha, I'm too late! I took a lunch break and then tried to scout around for the answer and found that I received the same error in fake scripts after I was calling something outside of its respective function. But it looks like you already got to that point, so I'm a tad too late. Glad you got it to work! :)

Kenny Tao · Accepted Answer · 2015-12-04 17:25:40Z

0

I got it to work. I had to tableView.reloadData() within the closure. Thank you so much for the help!

answered Dec 4, 2015 at 17:25

Kenny Tao

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