Replacing Object In Parse - arrays

Question

I'm trying to delete a saved Object in Parse and Replace it. My code is not working. My Parse Database is only adding objects with the same array name. Here is my code.......
#IBAction func finalSaveBTN(sender: AnyObject)
{
videoARY = [videoId, vidTitleText, vidDescription, vidIMG]
let videoSave = PFObject(className: "UserVideos")
videoSave.deleteInBackgroundWithBlock { (success, error) -> Void in
if success == true
{
videoSave["userObjectId"] = PFUser.currentUser()!.objectId
videoSave["vid\(self.saveValueLBL.text!)"] = self.videoARY
videoSave.saveInBackgroundWithBlock { (success, error ) -> Void in
if success == true
{
print("Succesfull")
}
}
}
else
{
print("Error")
}
}
}
I would like to delete the object, but if anyone knows how to successfully update a Parse array that'll help too. Thank you.
*** UPDATE ****
I'm trying this, not working either, what could be wrong....
#IBAction func finalSaveBTN(sender: AnyObject)
{
videoARY = [videoId, vidTitleText, vidDescription, vidIMG]
let videoSave = PFObject(className: "UserVideos")
let query = PFQuery(className: "UserVideos")
query.whereKey("userObjectId", equalTo: PFUser.currentUser()!.objectId!)
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
for object in objects!
{
let vid = object["vid\(self.saveValueLBL.text!)"]!
vid!.delete()
}
}
videoSave["userObjectId"] = PFUser.currentUser()!.objectId
videoSave["vid\(self.saveValueLBL.text!)"] = self.videoARY
videoSave.saveInBackgroundWithBlock { (success, error ) -> Void in
if success == true
{
print("Succesful")
}
}
}
**** UPDATE *****
I'm deleting all vids for videoSave. If you have any suggestions on how to target specific array I'll appreciate it. I'll try to rework and save as simply PFFile
#IBAction func finalSaveBTN(sender: AnyObject)
{
videoARY = [videoId, vidTitleText, vidDescription, vidIMG]
let videoSave = PFObject(className: "UserVideos")
let query = PFQuery(className: "UserVideos")
query.whereKey("userObjectId", equalTo: PFUser.currentUser()!.objectId!)
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
for object in objects!
{
if let vid = object["vid\(self.saveValueLBL.text!)"]!
{
vid.deleteInBackground()
vid.saveInBackground()
}
}
}
videoSave["userObjectId"] = PFUser.currentUser()!.objectId
videoSave["vid\(self.saveValueLBL.text!)"] = self.videoARY
videoSave.saveInBackgroundWithBlock { (success, error ) -> Void in
if success == true
{
print("Succesful")
}
}

Answer 1

There're a few obstacles here, let me walk you through them.
1:
let videoSave = PFObject(className: "UserVideos")
videoSave.deleteInBackgroundWithBlock {...}
The first problem is that you're trying to delete a brand new object you're creating, which hasn't been saved to the server yet. That's what let ... = PFObject(className:...) does, it creates a new object.
2: Updating parse arrays is really easy! If you have the object in your code, you can simply change your object with functions like, or , and then use .saveInBackgroundWithBlock, and Voila! If you don't have the object, you'll need to first create a version of your object without the data from the server, and then have it fetch it's info from your parse server, and THEN you can modify, and save it. Here's how you'd do those two things
PFObject(withoutDataWithObjectId: objectId)
PFObject().fetchIfNeededInBackgroundWithBlock({})
Finally, if you don't have the objectId of your object, then you'll have to find it using a PFQuery, and then using there .whereKey(...) to filter until found.
3: Are you aware that by calling videoSave["vid\(self.saveValueLBL.text!)"] = self.videoARY, you're saving to a column in your parse server named vid+the string of self.saveValueLBL.text!? You might be creating parse columns on the fly. Just a heads up!
4: Another problem is the videoSave["vid\(self.saveValueLBL.text!)"] = self.videoARY line. You can't save arrays of PFFiles. You'll have to keep that information in a separate column, with the designated type of PFFile.
5: In your new block of code, I don't think delete() works the way you think it does. If you wanna delete the entire object, use object.deleteInBackground(), if you just wanna delete an attribute of that object, you can use object.removeObjectForKey(...), and then object.saveInBackground().
Does this all make sense?

Answer 2

I didn't have to turn my array into a PFFile. I simply needed to add a second query. Basically I was querying all vids for current user. Addition of query.whereKeyExists narrowed it down to specific vid. It will also make my retrieving query easier. Here it is........
#IBAction func finalSaveBTN(sender: AnyObject)
{
videoARY = [videoId, vidTitleText, vidDescription, vidIMG]
let query = PFQuery(className: "UserVideos")
query.whereKey("userObjectId", equalTo: PFUser.currentUser()!.objectId!)
query.whereKeyExists("vid\(self.saveValueLBL.text!)")
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
for object in objects!
{
object.deleteInBackground()
object.saveInBackground()
}
}
let videoSave = PFObject(className: "UserVideos")
videoSave.setObject(self.videoARY, forKey: "vid\(self.saveValueLBL.text!)")
videoSave["userObjectId"] = PFUser.currentUser()!.objectId
videoSave.saveInBackgroundWithBlock { (success, error ) -> Void in
if success == true
{
print("Succesful")
}
}
}