[Core Data]: data: <fault> - swift

Question

The questions parameter in the function is full, but I cannot transfer assignments to questionsCD.questions?.questionList.
The id and title variables are not nil. Those variables are working in a healthy way.
In Console output, questions return nil.
I cannot assign the questionList variable in the QuestionsNSSecureCoding class, so I think it returns nil. Why ?
You can examine the Core Data Entity image to see the questionsCD.questions?.questionList in more detail.
Core Data Save Function:
func saveSelectedQuestion(questionTitle: String, id: String, questions: [QuestionList]) {
let questionsCD = QuestionCD(context: persistentContainer.viewContext)
questionsCD.title = questionTitle
questionsCD.id = id
questionsCD.questions?.questionList = questions
print("nil test: \(questionsCD.questions?.questionList ?? [])")
do {
try persistentContainer.viewContext.save()
} catch let error {
print("Failed to save selected category: \(error.localizedDescription)")
}
}
Core Data Get Function:
func getSelectedQuestion(questionID: String) -> [QuestionCD] {
let fetchRequest: NSFetchRequest<QuestionCD> = QuestionCD.fetchRequest()
let search = NSPredicate(format: "id == %#", questionID)
print("search: \(search)")
fetchRequest.predicate = search
fetchRequest.returnsObjectsAsFaults = false
print("request predicate: \(String(describing: fetchRequest.predicate))")
do {
return try persistentContainer.viewContext.fetch(fetchRequest)
} catch let error {
print("get hata: \(error.localizedDescription)")
return []
}
}
Console Output:
selectedQuestionCD [<QuestionCD: 0x2800e8e60> (entity: QuestionCD; id: 0x9d00d28ec7359eb0 <x-coredata://089E80AC-0E4F-4303-BF8F-47C31EC70ED4/QuestionCD/p2>; data: {
id = "agustos_test_1";
questions = nil;
title = "A\U011fustos Test 1";
})]
Core Data Entity:
Questions NSSecure Coding:
public class QuestionsNSSecureCoding: NSObject, NSSecureCoding {
public static var supportsSecureCoding: Bool = true
var questionList: [QuestionList]
required init(questions: [QuestionList]) {
self.questionList = questions
}
public func encode(with coder: NSCoder) {
coder.encode(questionList, forKey: "questionList")
}
required public init?(coder: NSCoder) {
questionList = coder.decodeObject(of: NSArray.self, forKey: "questionList") as? Array<QuestionList> ?? []
}
}
Questions Value Transformer:
#objc(QuestionsValueTransformer)
final class QuestionsValueTransformer: NSSecureUnarchiveFromDataTransformer {
static let name = NSValueTransformerName(rawValue: String(describing: QuestionsValueTransformer.self))
override static var allowedTopLevelClasses: [AnyClass] {
return [QuestionsNSSecureCoding.self]
}
public static func register() {
let transformer = QuestionsValueTransformer()
ValueTransformer.setValueTransformer(transformer, forName: name)
}
}
My Custom Model:
class QuestionContainer: Codable {
var questionCategories: [Question]
init(questionCategories: [Question]) {
self.questionCategories = questionCategories
}
}
class Question: Codable, Identifiable {
var title: String
var id: String
var questions: [QuestionList]
init(title: String, id: String, questions: [QuestionList]) {
self.title = title
self.id = id
self.questions = questions
}
}
class QuestionList: Codable, Identifiable {
var id: String
init(id: String) {
self.id = id
}
}

Answer 1

I think the problem is that questionCD.questions is nil, so the line
questionsCD.questions?.questionList = questions
does nothing. You need to create an instance of QuestionsNSSecureCoding with the correct questions array, and assign that to the questions property:
questionsCD.questions = QuestionsNSSecureCoding(questions: questions)