Iterate through a custom Parse column in Swift app - ios

Question

I want to know how I could store the entire custom column (the user Pointer<_User> column from a custom class) and put them all in an array variable so that I can see if a the user exists in that class or not. This is what I have:
Old Code
var objectUserIdArray = [String]()
let objectUserIdQuery : PFQuery = PFQuery(className: "Scores")
objectUserIdQuery.findObjectsInBackgroundWithBlock {
(objects : [PFObject]? , error : NSError?) -> Void in
var objectID = objects! as [PFObject]
for i in 0..<objectID.count {
objectUserIdArray.append(objectID[i].objectId!)
}
for _ in objectID {
print(objectUserIdArray)
}
New Code
func saveScoresOnParse() {
objectUserIdQuery.whereKey("User", equalTo: PFObject(withoutDataWithClassName: "_User", objectId: userID))
objectUserIdQuery.findObjectsInBackgroundWithBlock {
(objects : [PFObject]? , error : NSError?) -> Void in
if error == nil {
//var objectID = objects! as [PFObject]
/*for i in 0..<objectID.count {
self.objectUserIdArray.append( objectID[i].objectId! )
}*/
for _ in objects! {
print(objects)
}
// The score key has been incremented
for (var i = 0 ; i < self.objectUserIdArray.count ; i++) {
if self.userID != objects![i] {
print("New Scores")
print("R: \(self.rightAnswers)")
print("W: \(self.wrongAnswers)")
print("S: \(self.skippedQuestions)")
self.scores["User"] = PFUser.currentUser()
self.scores["Right"] = self.rightAnswers
self.scores["Wrong"] = self.wrongAnswers
self.scores["Skipped"] = self.skippedQuestions
self.scores.saveInBackground()
} else if self.userID == objects![i] {
print("Updated Scores")
self.scores.incrementKey("Right", byAmount: 1)
self.scores.incrementKey("Wrong", byAmount: 1)
self.scores.incrementKey("Skipped", byAmount: 1)
print("R: \(self.rightAnswers)")
print("W: \(self.wrongAnswers)")
print("S: \(self.skippedQuestions)")
self.scores.saveInBackgroundWithBlock {
(success: Bool, error: NSError?) -> Void in
if (success) {
// The score key has been incremented
} else {
// There was a problem, check error.description
}
}
} else {
print("Error")
}
}
} else {
print(error)
}
}
But it only stores the objectId column and not the Pointer<_User> column. I know this because when I print the stuff that is inside, it prints out the objectIds.
This is what happens, instead of just updating the current user's scores, it just makes new ones. I want the if statement to check if the user already exists in that column and if it does updates the scores and if it doesn't, make new ones. (The new code's if statement doesn't work, i have to bring it out for it to save...)

Answer 1

Your updated question make clearer what you are actually wanting to do;
Save or update a user's scores in your Parse Score object. To do this, there is no reason to retrieve any object Ids or loop through any results. More often than not you don't do use Object Ids explicitly when using Parse; you can simply pass the object itself with Parse working out the references for you.
I am not sure how you exactly want to change the scores; in your code above you increment in one case but set the scores explicitly in another, but the code below shows the general approach.
If you are frequently or repeatedly going to update a score record then you could make your code more efficient by holding a reference to the Scores object in a property after you find it the first time and simply update & save it subsequently.
func saveScoresOnParse() {
if let currentUser=PFUser.currentUser() {
let scoreQuery= PFQuery(className: "Scores")
scoreQuery.whereKey("User",equalTo:currentUser)
scoreQuery.getFirstObjectInBackgroundWithBlock {
(object : PFObject? , error : NSError?) -> Void in
if error == nil {
var scoreObject=object ?? PFObject.objectWithClassName("Scores")
if (scoreObject["User"]==nil) {
scoreObject["User"]=currentUser
}
scoreObject["Right"]=self.rightAnswers
scoreObject.saveInBackground()
} else {
print(error)
}
}
} else {
print("No current user!")
}
}