I am getting the following error while saving data to CoreData. my model has the dictionary property. I created NSSecureCoding and NSSecureUnarchiveFromDataTransformer classes. please check if i can encode my model correctly. I couldn't understand what I am doing wrong ? The problem is not with Dictionary or Data properties. Why can't I save data to CoreData?
I know little English. Thank you for your understanding.
GitLab Project Link:
It is a very simple one page project. I will be glad if you check it out.
Core Data Test Project
Console Output:
2021-08-21 23:58:18.490834+0300 CoreDataTest[35689:2901360] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x2827f0240> , <shared NSSecureUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x2827f0240> , <shared NSSecureUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
Failed to save selected category: A Core Data error occurred.
Core Data Entity:
My Custom Model:
Notice my model has a Dictionary.
var sections: [QuestionSections.RawValue : String]
I am trying to save dictionary in CoreData. I thought the problem was in the dictionary but the problem is not in the dictionary.
class QuestionContainer: NSObject, Codable {
var questionCategories: [Question]
init(questionCategories: [Question]) {
self.questionCategories = questionCategories
}
}
public class Question: NSObject, Codable {
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
}
}
public class QuestionList: NSObject, Codable {
init(id: String, question: String, isQuestionImage: Bool, isSectionImage: Bool, imageURL: String, imageData: Data? = nil, sections: [QuestionSections.RawValue : String], selected: String, correct: String) {
self.id = id
self.question = question
self.isQuestionImage = isQuestionImage
self.isSectionImage = isSectionImage
self.imageURL = imageURL
self.imageData = imageData
self.sections = sections
self.selected = selected
self.correct = correct
}
var id: String
var question: String
var isQuestionImage, isSectionImage: Bool
var imageURL: String
var imageData: Data?
var sections: [QuestionSections.RawValue : String]
var selected: String
var correct: String
}
enum QuestionSections: String, Codable {
case A = "A"
case B = "B"
case C = "C"
case D = "D"
}
NSSecure Unarchive From Data Transformer:
@objc(QuestionsValueTransformer)
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)
}
}
CoreData Save Function:
func saveSelectedQuestion(questionTitle: String, id: String, questions: [QuestionList]) {
let questionsCD = QuestionCD(context: persistentContainer.viewContext)
questionsCD.title = questionTitle
questionsCD.id = id
questionsCD.questions = questions
do {
try persistentContainer.viewContext.save()
} catch {
print("Failed to save selected category: \(error.localizedDescription)")
}
}
