Cannot add String to Array for PFUser

Question

I have a button that pushes to a feed, I would like to record the name of the Feed Item in an array ("itemChosen") in my PFUser class every time the button is clicked:

@IBAction func buttonTapped(sender: UIButton) {

        PFUser.currentUser()!.addObject(feedItem.feedItemName, forKey: "itemChosen")
        PFUser.currentUser()!.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
            println(PFUser.currentUser()?.objectForKey("itemChosen"))
        })
}

I get the error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Operation is invalid after previous operation.'

If I use:

PFUser.currentUser()!.setObject(feedItem.feedItemName, forKey: "itemChosen")

I can save the name as a singular String, but I want to append it into an array. Why doesn't addObject work and how can I fix it?

The _User class is better for LOGIN AND SIGN UP purposes. It would be to create a new class into parse then when you are ready to save data you only associate their id with that data. — Lamour
– Lamour, Commented Aug 26, 2015 at 22:07

egor.zhdan · Accepted Answer · 2015-08-26 22:33:05Z

1

Try doing this:

@IBAction func buttonTapped(sender: UIButton) {
    if PFUser.currentUser()!["itemChosen"] == nil { PFUser.currentUser()!["itemChosen"] = [String]() }
    (PFUser.currentUser()!["itemChosen"] as! NSMutableArray).addObject(feedItem.feedItemName)
    PFUser.currentUser()!.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
        println(PFUser.currentUser()?.objectForKey("itemChosen"))
    })
}

The problem is that PFUser.currentUser!["itemChosen"] can be nil.

Edit: I found a way to do it using Xcode 6:

extension PFUser {
    var param: [String] {
        get {
            if let x = self["itemChosen"] as? [String] {
                return x
            } else {
                return []
            }
        }
        set(val) {
            self["itemChosen"] = val
        }
    }
}

@IBAction func buttonTapped(sender: UIButton) {
    PFUser.currentUser()!.param.append(feedItem.feedItemName)
    PFUser.currentUser()!.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
        println(PFUser.currentUser()?.objectForKey("itemChosen"))
    })
}

edited Aug 26, 2015 at 22:33

answered Aug 26, 2015 at 21:29

egor.zhdan

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9 Comments

SamYoungNY Over a year ago

Thanks for your answer.. I tried this and what I get is an error on line 2 'operand of postfix ! should have an optional type; type is () -> PFUser?' -- so I remove the !, and I get the following error '() -> PFUser does not have a member named 'subscript''

egor.zhdan Over a year ago

@SamYoungNY sorry, forgot to write an initializer. Edited now.

SamYoungNY Over a year ago

thanks but unfortunately I am getting the same errors

egor.zhdan Over a year ago

@SamYoungNY finally fixed. Now using NSMutableArray instead of [String]

SamYoungNY Over a year ago

Which version of Xcode are you using? Mine is v6.3.1 and I think that the next error I got may be due to this. After clicking button: Could not cast value of type 'Swift._SwiftDeferredNSArray' to 'NSMutableArray'. According to this post it may be Xcode related: stackoverflow.com/questions/30190848/…

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