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将数据保存到 CoreData 时出现以下错误。我使这个项目变得非常简单,以便您查看我的项目。项目中有Local json。您可以下载并测试我的项目。
GitLab 项目链接: Core Data Test Project
2021-08-20 20:17:03.576453+0300 CoreDataTest[27924:2275095] [error] warning: Multiple NSEntityDescriptions claim the NSManagedObject subclass 'QuestionCD' so +entity is unable to disambiguate.
CoreData: warning: Multiple NSEntityDescriptions claim the NSManagedObject subclass 'QuestionCD' so +entity is unable to disambiguate.
2021-08-20 20:17:03.576623+0300 CoreDataTest[27924:2275095] [error] warning: 'QuestionCD' (0x28090c9a0) from NSManagedObjectModel (0x281d3d400) claims 'QuestionCD'.
CoreData: warning: 'QuestionCD' (0x28090c9a0) from NSManagedObjectModel (0x281d3d400) claims 'QuestionCD'.
2021-08-20 20:17:03.576675+0300 CoreDataTest[27924:2275095] [error] warning: 'QuestionCD' (0x2809142c0) from NSManagedObjectModel (0x281d33ca0) claims 'QuestionCD'.
CoreData: warning: 'QuestionCD' (0x2809142c0) from NSManagedObjectModel (0x281d33ca0) claims 'QuestionCD'.
2021-08-20 20:17:03.576720+0300 CoreDataTest[27924:2275095] [error] warning: 'QuestionCD' (0x2809148f0) from NSManagedObjectModel (0x281d4cf50) claims 'QuestionCD'.
CoreData: warning: 'QuestionCD' (0x2809148f0) from NSManagedObjectModel (0x281d4cf50) claims 'QuestionCD'.
2021-08-20 20:17:03.576762+0300 CoreDataTest[27924:2275095] [error] warning: 'QuestionCD' (0x280914fd0) from NSManagedObjectModel (0x281d4e490) claims 'QuestionCD'.
CoreData: warning: 'QuestionCD' (0x280914fd0) from NSManagedObjectModel (0x281d4e490) claims 'QuestionCD'.
2021-08-20 20:17:03.576804+0300 CoreDataTest[27924:2275095] [error] error: +[QuestionCD entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
CoreData: error: +[QuestionCD entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
2021-08-20 20:17:03.585701+0300 CoreDataTest[27924:2275095] [general] 'NSKeyedUnarchiveFromData' should not be used to for un-archiving and will be removed in a future release
2021-08-20 20:17:03.585897+0300 CoreDataTest[27924:2275095] -[CoreDataTest.QuestionList encodeWithCoder:]: unrecognized selector sent to instance 0x281028400
2021-08-20 20:17:03.586179+0300 CoreDataTest[27924:2275095] *** -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding called on it.
2021-08-20 20:17:03.586297+0300 CoreDataTest[27924:2275095] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
2021-08-20 20:17:03.586383+0300 CoreDataTest[27924:2275095] [error] error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
CoreData: error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
2021-08-20 20:17:03.586553+0300 CoreDataTest[27924:2275095] [general] 'NSKeyedUnarchiveFromData' should not be used to for un-archiving and will be removed in a future release
2021-08-20 20:17:03.586649+0300 CoreDataTest[27924:2275095] -[CoreDataTest.QuestionList encodeWithCoder:]: unrecognized selector sent to instance 0x281028400
2021-08-20 20:17:03.586799+0300 CoreDataTest[27924:2275095] *** -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding called on it.
2021-08-20 20:17:03.586874+0300 CoreDataTest[27924:2275095] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
2021-08-20 20:17:03.586942+0300 CoreDataTest[27924:2275095] [error] error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
CoreData: error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
2021-08-20 20:17:03.587088+0300 CoreDataTest[27924:2275095] [general] 'NSKeyedUnarchiveFromData' should not be used to for un-archiving and will be removed in a future release
2021-08-20 20:17:03.587163+0300 CoreDataTest[27924:2275095] -[CoreDataTest.QuestionList encodeWithCoder:]: unrecognized selector sent to instance 0x281028400
2021-08-20 20:17:03.587301+0300 CoreDataTest[27924:2275095] *** -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding called on it.
2021-08-20 20:17:03.587372+0300 CoreDataTest[27924:2275095] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b0d5c0> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
2021-08-20 20:17:03.587434+0300 CoreDataTest[27924:2275095] [error] error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
CoreData: error: -executeRequest: encountered exception = <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo = (null)
2021-08-20 20:17:03.599299+0300 CoreDataTest[27924:2275095] [general] 'NSKeyedUnarchiveFromData' should not be used to for un-archiving and will be removed in a future release
2021-08-20 20:17:03.599618+0300 CoreDataTest[27924:2275095] -[CoreDataTest.QuestionList encodeWithCoder:]: unrecognized selector sent to instance 0x281028400
2021-08-20 20:17:03.599908+0300 CoreDataTest[27924:2275095] *** -[NSKeyedArchiver dealloc]: warning: NSKeyedArchiver deallocated without having had -finishEncoding called on it.
2021-08-20 20:17:03.600018+0300 CoreDataTest[27924:2275095] [error] error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b04000> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLSaveChangesRequestContext: 0x280b04000> , <shared NSKeyedUnarchiveFromData transformer> threw while encoding a value. with userInfo of (null)
Failed to save selected category: A Core Data error occurred.
源代码编辑器功能受限错误(这是什么?/为什么?):
核心数据实体:
核心数据保存功能:
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)")
}
}
型号:
class QuestionContainer: NSObject, Codable {
var questionCategories: [Question]
init(questionCategories: [Question]) {
self.questionCategories = questionCategories
}
}
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: Sections, 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: Sections
var selected: String
var correct: String
}
public class Sections: NSObject, Codable {
init(a: String, b: String, c: String, d: String) {
self.a = a
self.b = b
self.c = c
self.d = d
}
var a, b, c, d: String
private enum CodingKeys: String, CodingKey {
case a = "A"
case b = "B"
case c = "C"
case d = "D"
}
}
我保存数据的页面:
我正在保存此页面的数据。
struct QuestionCategoryCellView: View {
@ObservedObject var questionCategoryCellViewModel = QuestionCategoryCellViewModel()
var questionTitle: String
var questionID: String
@Binding var questions: [QuestionList]
var body: some View {
Button(action: {
print("title: \(questionTitle)")
if questionCategoryCellViewModel.searchCategoryInCoreData(id: questionID) {
print("already saved")
} else {
questionCategoryCellViewModel.saveSelectedQuestionsToCoreData(questionTitle: questionTitle, id: questionID, questions: questions)
}
}) {
Text(questionTitle)
}
}
}
最佳答案
在您的错误消息中有四个这样的消息对:
2021-08-20 20:17:03.576623+0300 CoreDataTest[27924:2275095] [error] warning: 'QuestionCD' (0x28090c9a0) from NSManagedObjectModel (0x281d3d400) claims 'QuestionCD'.
CoreData: warning: 'QuestionCD' (0x28090c9a0) from NSManagedObjectModel (0x281d3d400) claims 'QuestionCD'.
但是仔细看,模型的内存地址每次都不一样。这里是0x281d3d400
,其他3次都不一样。那是因为内存中有四个不同的托管对象模型副本。您不止一次加载模型并混淆了核心数据。它是同一个实体,但 Core Data 对在哪里使用它感到困惑。
查看您的代码,发生这种情况是因为对于表格中的每个单元格,
您创建一个 QuestionCategoryCellView
QuestionCategoryCellView
创建一个 QuestionCategoryCellViewModel
QuestionCategoryCellViewModel
的每个实例都具有此属性:
let coreDM: CoreDataManager = CoreDataManager()
每个 CoreDataManager
调用 persistentContainer.loadPersistentStores
。
因此,每个单元格都会加载持久容器。那永远不应该发生。您有四个单元,每个单元都有自己的持久容器,每个容器都有自己的模型副本。
您的 CoreDataManager
或 persistentContainer
只需创建一次,然后用于每个单元格。我会说选择单例 CoreDataManager
但两者都可能有效。
一个简单的方法是
将此行添加到 CoreDataManager
:
static var shared = CoreDataManager()
更改 QuestionCategoryCellViewModel
,这样它就不会创建 CoreDataManager
,而是执行以下操作:
let coreDM: CoreDataManager = CoreDataManager.shared
如果你这样做,你就会避免这个问题。
然而,您会在代码中遇到一个完全不同的错误。您的数据模型使用 [QuestionList]
作为可转换属性的类型。但是 QuestionList
不符合 NSCoding
,因此当应用程序崩溃时它不起作用。在这里问一个不同的问题。
关于swift - [核心数据] :Multiple NSEntityDescriptions claim the NSManagedObject subclass 'Core Data Model' so +entity is unable to disambiguate,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68866385/
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