Fetch One Attribute of NSManagedObject after Pressing a Button in UITableViewCell - swift

Question

I'm using core data and I have a tableView to display all user's approvals
I'm using NSFetchedResultsController to fetch the approvals from core data
I have added these methods which are used when the delegate is notified that the content will change, we tell the tableView to begin updates
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView.beginUpdates()
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.endUpdates()
}
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) {
// 1
switch type {
case .Insert:
tableView.insertSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Automatic)
case .Delete:
tableView.deleteSections(NSIndexSet(index: sectionIndex), withRowAnimation: .Automatic)
default: break
}
}
func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
// 2
switch type {
case .Insert:
tableView.insertRowsAtIndexPaths([newIndexPath!], withRowAnimation: .Automatic)
case .Delete:
tableView.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: .Automatic)
default: break
}
}
what I understood: the NSFetchtedResultsController can monitor changes to the NSManagedObject context and update the table to reflect those changes
In tableViewCell I have "inquire Again" button which will update the Approval Status
and this is ApprovalObject Class:
public class ApprovalObject: NSManagedObject {
#NSManaged public var reference_no: NSNumber
#NSManaged public var status: String
#NSManaged public var date: NSDate
#NSManaged public var card: Card
#NSManaged public var hospital: Hospital
}
my question is: how to get the value of "status" attribute for specific "ApprovalObject" after pressing the button in the tableViewCell ?? can I just call tableView.beginUpdates() ??
#IBAction func inquireApprovalBtn(sender: AnyObject) {
// what should i do here ???
}

Answer 1

It is enough to modify your data object, e.g. the status of your ApprovalObject instance (and save if desired). The NSFetchedResultsControllerDelegate should pick up on that and update the cell in question.
Of course, you have at some point deleted the .Change case in your switch statement in the delegate callback. Make sure you put it back in. (You can copy it from a "Master-Detail" Xcode template.)