CloudKit: How to update a record in a Container's Public Database (Swift)

ios-cloudkit-swift-updaterecord

        //get the container for the App
        let defaultContainer: CKContainer = CKContainer.defaultContainer()
        
        //get the PublicDatabase inside the Container
        let publicDatabase: CKDatabase = defaultContainer.publicCloudDatabase
        
        //create a record id for the target record we want to fetch then update
        let wellKnownID: CKRecordID = CKRecordID(recordName: "1")
        
        //fetch the target record using it's record id
        publicDatabase.fetchRecordWithID(wellKnownID, completionHandler: { (record, error) -> Void in
            
            if error != nil {
                
                println("Uh oh, there was an error fetching...")
                println(error.localizedDescription)
            }
            
            if record != nil {
                
                //update a property
                record.setObject("123 Beggers Canyon, Tatooine", forKey: "address")
                
                //save the update back to the target database
                publicDatabase.saveRecord(record, completionHandler: { (updateRecord, updateError) -> Void in
                    
                    if updateError != nil {
                        
                        println("Uh oh, there was an error updating...")
                        println(error.localizedDescription)
                    }
                    
                    if updateRecord != nil {
                        
                        println("Updated record Successflly")
                        println(record.objectForKey("title"))
                        println(record.objectForKey("description"))
                        println(record.objectForKey("address"))
                        println(record.objectForKey("location"))
                    }
                })
            }
        })