How to delete object from Parse via PFQuery

Question

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)
        }
    })
}

Pak Ho Cheung · Accepted Answer · 2016-10-15 20:31:31Z

2

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

edited Oct 15, 2016 at 20:31

answered Oct 15, 2016 at 19:40

Pak Ho Cheung

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4 Comments

J.M Over a year ago

Thank you. How can I use 1 query for this?

Pak Ho Cheung Over a year ago

First, you need to think about conditions like what is the condition for deleting objects? what is the condition for performing segue? How about else case?

J.M Over a year ago

Alright. As mentioned in the question, the condition for deleting the object is that it belongs to the current user, AND that the key "requestResponded" is not True.

J.M Over a year ago

Perfect, it works! Thank you so much! I just realized there's no need for a segue within this particular function. Again, thank you.

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