swift - retrieve objectId field causes fatal error - ios

Question

Here is my code:
#IBAction func saveSettings(sender: AnyObject) {
var settings:PFObject = PFObject(className: "Settings")
settings["routes"] = routesSetting as String
settings["sortBy"] = sortBySetting as String
settings["user"] = PFUser.currentUser()
settings.saveInBackgroundWithBlock{(success:Bool!, error:NSError!) ->Void in
if success != nil {
NSLog("%#","OK-settings data saved")
NSLog("%#",self.routesSetting as String)
}
else
{
NSLog("%#",error)
}
}
}
#IBAction func updateSettings(sender: AnyObject) {
var settings:PFObject = PFObject(className:"Settings")
var id = settings["objectId"] as String
var query = PFQuery(className:"Settings")
println(settings)
println(id)
println(query)
query.getObjectInBackgroundWithId(id) {
(settings: PFObject!, error: NSError!) -> Void in
if error != nil {
NSLog("%#", error)
} else {
settings["routes"] = self.routesSetting as String
settings["sortBy"] = self.sortBySetting as String
settings.save()
}
}
I can run the saveSettings code with no issues. I have set it up to run when a new user signs up with the application. I have verified that a new row is inserted into the settings table in the Parse cloud DB. But I would now like to simply UPDATE the single row instead of create a new row every time there is a save. So I have been working on the updateSettings function. I have followed the Parse documentation for updating objects (https://parse.com/docs/ios_guide#objects-updating/iOS). When I click on the Update button to run the function, I get:
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
The line it points to is:
var id = settings["objectId"] as String
I am a complete beginner to Parse.
Some recent additional information:
The results of the println statements:
<Settings: 0x7fd423805260,
objectId: new, localId: (null)> {
}
nil
<PFQuery: 0x7fd4217191f0>
So part of the problem is it is not retrieving the objectId?

Answer 1

PFObject has a property called "objectId", it is not stored in a dictionary, so you can return it as
var id = settings.objectId