CODEWITHSUNDEEP
iosswiftparse-platform
J.M
J.M

Reputation: 43

How to delete object from Parse via PFQuery

I am trying to delete an object from the class UserRequests via swift only if the object belongs to the current user, and that requestResponded is not equal to true. However, I get an error at objects.deleteInBackground() and the function still doesn't work when I remove this line.

func deleteRequest(){
    let check = PFQuery(className: "UserRequests")
    check.whereKey("requestResponded", equalTo: "True")

    let query = PFQuery(className: "UserRequests")
    query.whereKey("username", equalTo: (PFUser.currentUser()?.objectForKey("username") as! String))
    query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
        if objects != nil && error == nil{
            // Successfully retrieved the object
            check.getFirstObjectInBackgroundWithBlock {
                (object: PFObject?, error: NSError?) -> Void in
                if error != nil || object == nil {
                    print("Not accepted.")
                    object!.deleteInBackground()
                    objects.deleteInBackground()
                } else {
                    print("Successfully retrieved the object.")
                }
            }
        }else{
            self.performSegueWithIdentifier("requestAccepted", sender: self)
        }
    })
}

Upvotes: 1

Views: 330

Answers (1)

Pak Ho Cheung
Pak Ho Cheung

Reputation: 1426

It is because objects is an list of object. You should only delete object 1 by 1.

For example:

for object in objects {
    object.deleteInBackground()
}

Also, because two queries belong to same class. I would suggest using 1 query

UPDATE

func deleteRequest(){
    let query = PFQuery(className: "UserRequests")
    // the key "requestResponded" is not True
    query.whereKey("requestResponded", equalTo: "False")
    // for deleting the object is that it belongs to the current user
    query.whereKey("username", equalTo (PFUser.currentUser()?.objectForKey("username") as! String))
    query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
        if error != nil{
            print(error)
        }
        //  objects are those the key "requestResponded" is not True and belongs to the current user
        for object in objects {
            object.deleteInBackground()
        }
        // other case
        if objects.count == 0 { // no match result found
        }
    })
}

I guess you still miss the condition of when to perform segue

Upvotes: 2

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