Swift Parse - Save Object Where Key

Question

I am trying to update an array column in a Parse class (i.e. column name is friendsRequestList) with an object. I searched and only could find one way to do so which is:

let query = PFQuery(className: "FriendsConnections")
           query.getObjectInBackgroundWithId(self.friendObject.objectId!) {
            (user: PFObject?, error: NSError?) -> Void in
            if error != nil {
                print(error)
            } else if let user = user {
                user.addObject(self.userObject, forKey: "friendsRequestList")
                user.saveInBackground()
            }
        }

The only issue here is that function getObjectInBackgroundWithId requires object ID and I would like to have a query.wherekey instead as it works more with data I have in Parse.

How can I do the above without using objectID but using a whereKey instead.

Thanks

Update: New code based on answer provided but still didn't work:

let query = PFQuery(className: "FriendsConnections")
        query.whereKey("appUsername", equalTo: self.friendObject.username!)
        query.findObjectsInBackgroundWithBlock {
            (objects: [PFObject]?, error: NSError?) -> Void in

            if error == nil {
                // Do something with the found objects
                if let objects = objects {
                    for object in objects {
                        print("Processing Object")
                        object.addObject(PFUser.currentUser()!["appUsername"], forKey: "friendsRequestList")
                        object.saveInBackground()
                    }
                }
            } else {
                // Log details of the failure
                print("Error: \(error!) \(error!.userInfo)")
            }
        }

Ignore it because it wouldn't be relevant in the solution to the problem since I will not use ObjectID. Just assume I want to update a column where a username matches the supplied argument — ksa_coder
– ksa_coder, Commented Jan 17, 2016 at 16:17

Jacob · Accepted Answer · 2016-01-17 17:50:46Z

1

I think I understand what you're saying, so here's my go at it:

let query = PFQuery(className: "FriendsConnections")
query.whereKey("username", equalTo: mySuppliedArgument)
query.findObjectsInBackgroundWithBlock {
  (objects: [PFObject]?, error: NSError?) -> Void in

  if error == nil {
    // The find succeeded.
    print("Successfully retrieved \(objects!.count) scores.")
    // Do something with the found objects
    if let objects = objects {
      for object in objects {
        object.addObject(self.userObject, forKey: "friendsRequestList")
        object.saveInBackground()
      }
    }
  } else {
    // Log details of the failure
    print("Error: \(error!) \(error!.userInfo)")
  }
}

answered Jan 17, 2016 at 17:50

Jacob

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3 Comments

ksa_coder Over a year ago

I tried the code (modified the fields of course) and updated original post above. Still didn't work. It is not printing Processing Object statement which means it is not going into the if. no errors

Jacob Over a year ago

@ksa_coder And can you verify that there are objects in your database that match the query constraints?

ksa_coder Over a year ago

got it working. Silly error from my side. Thanks for helping out mate :)

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