I seem to be getting this error.
*** -[NSDecimalNumber retain]: message sent to deallocated instance 0x174222220
The first time I run the app, the code executes fine, but if I got back to that VC, the app crashes with the message above. I did some research and I think it means that some how that NSDecimal is being released. It's very odd, as I have 3 other decimals all set up the exact same way that are working.
The decimals are being stored in Core Data, and then being set to a label in my VC in side the cellForIndexAt method.
print("\(historyEntry.newAmount) new amount")
The very first time I get back the correct amount. But the second time or if I try move the tableview the app crashes with the message above. What would cause the decimal to release itself?
EDIT
I have a CoreDataStack swift file and the managedContext is being created like this:
lazy var managedContext: NSManagedObjectContext = {
return self.storeContainer.viewContext
}()
I am fetching the object like this:
// load the data
let fetchRequest: NSFetchRequest<Statement> = Statement.fetchRequest()
fetchRequest.predicate = NSPredicate(format:"person.name == %@ AND amountOwed >= 0", personName)
let sort = NSSortDescriptor(key: #keyPath(Statement.amountOwed), ascending: true)
fetchRequest.sortDescriptors = [sort]
positiveFetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: coreDataStack.managedContext, sectionNameKeyPath: nil, cacheName: nil)
do{
try positiveFetchedResultsController.performFetch()
}catch let error as NSError{
print("Fetching error: \(error), \(error.userInfo)")
}
positiveFetchedResultsController.delegate = self
I think pass the fetched object that I am using to another ViewController and access its properties like this:
print("\(historyEntry.changeAmount) change amount") // gives me back the correct amount that was saved evrytime.
This attribute however crashes after the first time
print("\(historyEntry.newAmount) new amount") // first time correct, after that error message from above.
EDIT
Here is the CoreDataStack class
import Foundation
import CoreData
class CoreDataStack {
private let modelName: String
init(modelName: String) {
self.modelName = modelName
}
lazy var managedContext: NSManagedObjectContext = {
return self.storeContainer.viewContext
}()
private lazy var storeContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: self.modelName)
container.loadPersistentStores { (storeDescription, error) in
if let error = error as NSError? {
print("Unresolved error \(error), \(error.userInfo)")
}
}
return container
}()
func saveContext () {
guard managedContext.hasChanges else { return }
do {
try managedContext.save()
} catch {
let nserror = error as NSError
print("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
