Query from Parse.com if object not exist

Question

This is my query code from parse:

func queryFromParse(){
        //var query = PFQuery(className: "Posts")
        var query = PFQuery(className: "currentUploads")
        query.orderByDescending("createdAt")
        query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]?, error:NSError?) -> Void in
            if error == nil
            {
                if let newObjects = objects as? [PFObject] {

                    for oneobject in newObjects {
                        let text = oneobject["imageText"] as! String
                        let username = oneobject["username"] as! String
                        let time = oneobject.createdAt!
                        let userImage = oneobject["imageFile"] as! PFFile
                        let imageURL = userImage.url // <- Bruker nå userImage.URL, henter ikke bildefilen med en gang

                        var OneBigObject = Details(username: username, text: text, CreatedAt: time, image: imageURL!)

                        self.arrayOfDetails.append(OneBigObject)

                        dispatch_async(dispatch_get_main_queue()) { self.collectionView.reloadData() }

                    }
                }
            }
        }
    }

I get error in code:

let userImage = oneobject["imageFile"] as! PFFile

fatal error: unexpectedly found nil while unwrapping an Optional value

I know why, because one of the rows in parse does not contains image:

Any ideas? What can I do to not get crash if there is not image there?

Erik Auranaune · Accepted Answer · 2015-09-13 22:16:16Z

Here you go, try something likt this:

func queryFromParse(){
        var query = PFQuery(className: "currentUploads")
        query.orderByDescending("createdAt")
        query.findObjectsInBackgroundWithBlock { (objects:[AnyObject]?, error:NSError?) -> Void in
            if error == nil
            {
                if let newObjects = objects as? [PFObject] {

                    for oneobject in newObjects {
                        let text = oneobject["imageText"] as! String
                        let username = oneobject["username"] as! String
                        let time = oneobject.createdAt!

                        if let userImage = oneobject["imageFile"] as? PFFile {
                            let userImage = oneobject["imageFile"] as! PFFile

                            let imageURL = userImage.url // <- Bruker nå userImage.URL, henter ikke bildefilen med en gang

                            var OneBigObject = Details(username: username, text: text, CreatedAt: time, image: imageURL!)

                            self.arrayOfDetails.append(OneBigObject)

                            dispatch_async(dispatch_get_main_queue()) { self.collectionView.reloadData() }
                        }
                    }
                }
            }
        }
    }

Kristijan Delivuk · Accepted Answer · 2015-09-13 20:51:06Z

0

optionally unwrap that object:

let imageFile = oneobject["imageFile"] as PFFile
imageFile.getDataInBackgroundWithBlock {
  (imageData: NSData?, error: NSError?) -> Void in
  if error == nil {
    if let imageData = imageData {
        let image = UIImage(data:imageData)
    }
  }
}

edited Sep 13, 2015 at 20:51

answered Sep 13, 2015 at 20:20

Kristijan Delivuk

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7 Comments

Eri-Sklii Over a year ago

But what happen if i have a list of 1000 images, and only 1 of them has no image? Then it will not show any images at all, or?

Eri-Sklii Over a year ago

Hm, whats wrong here?: s16.postimg.org/ne1ciqm6d/…

Eri-Sklii Over a year ago

I am still getting that error tho: s27.postimg.org/nqjbtqtcz/…

Kristijan Delivuk Over a year ago

well u cant get url from image stored in parse database .. it doesnt make sense ...

Eri-Sklii Over a year ago

Yes, because in cellForItemAtIndexPath, i use this: "cell.imageView.setImageWithUrl(NSURL(string: post.image)!, placeHolderImage: UIImage(named: "Placeholder"))"

|

Beslan Tularov · Accepted Answer · 2015-09-13 22:07:13Z

0

try use this

if let userImage = oneobject["imageFile"] as? PFFile {
            let imageURL = userImage.url
        }

edited Sep 13, 2015 at 22:07

answered Sep 13, 2015 at 21:43

Beslan Tularov

3,1311 gold badge25 silver badges34 bronze badges

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