核心数据 NSManagedObject 没有有效的 NSEntityDescription [英] Core Data NSManagedObject doesn't have a valid NSEntityDescription
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问题描述
我正在尝试使用我的 Xcode 项目设置核心数据，但遇到了一个我似乎无法摆脱的错误.我在 StudyHub.xcdatamodeld 中有一个名为 UserDetails 的实体.我在 AppDelegate 中的代码:
I am trying to set up core data with my Xcode project and running into an error that I can't seem to get rid of. I have an entity called UserDetails inside of StudyHub.xcdatamodeld. My code in the AppDelegate:
// MARK: - Core Data stack
lazy var persistentContainer: NSPersistentContainer = {
/*
The persistent container for the application. This implementation
creates and returns a container, having loaded the store for the
application to it. This property is optional since there are legitimate
error conditions that could cause the creation of the store to fail.
*/
let container = NSPersistentContainer(name: "DELETE")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is locked.
* The device is out of space.
* The store could not be migrated to the current model version.
Check the error message to determine what the actual problem was.
*/
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
// MARK: - Core Data Saving support
func saveContext () {
let context = persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
// MARK: Send Data to CoreData
func saveUserDetails(data: [String: String]) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let user = UserDetails(context: context)
if let authenticatedWith = data["authenticatedWith"] {
user.authenticatedWith = authenticatedWith
}
if let email = data["email"] {
user.email = email
}
if let fullName = data["fullName"] {
user.fullName = fullName
}
if let username = data["username"] {
user.username = username
}
if let schoolName = data["schoolName"] {
user.schoolName = schoolName
}
if let schoolUID = data["schoolUID"] {
user.schoolUID = schoolUID
}
if let facebookLink = data["facebookLink"] {
user.facebookLink = facebookLink
}
if let twitterLink = data["twitterLink"] {
user.twitterLink = twitterLink
}
if let instagramLink = data["instagramLink"] {
user.instagramLink = instagramLink
}
if let vscoLink = data["vscoLink"] {
user.vscoLink = vscoLink
}
appDelegate.saveContext()
}
我用于检索存储在 ViewController 中的数据的代码:
My code for retrieving the data stored inside of a ViewController:
let user = UserDetails()
if (user.username != "") {
self.navigationItem.title = user.username
} else {
self.navigationItem.title = "Account."
}
self.usersNameLabel.text = user.fullName
if (user.schoolName != "") {
self.usersSchoolNameLabel.setTitle(user.schoolName, for: .normal)
self.usersSchoolNameLabel.isHidden = false
} else {
self.addSchoolButton.isHidden = false
}
self.checkSocialLink(link: user.facebookLink!, button: self.facebookLinkButton) // TODO: Force unwrap might not work
self.checkSocialLink(link: user.twitterLink!, button: self.twitterLinkButton)
self.checkSocialLink(link: user.instagramLink!, button: self.instagramLinkButton)
self.checkSocialLink(link: user.vscoLink!, button: self.vscoLinkButton)
我得到的错误:
2017-01-13 21:22:58.675995 StudyHub[3328:27695] [error] error: Failed to load model named DELETE
CoreData: error: Failed to load model named DELETE
2017-01-13 21:22:58.699 StudyHub[3328:27695] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An NSManagedObject of class 'UserDetails' must have a valid NSEntityDescription.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000114fa2d4b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000114a0b21e objc_exception_throw + 48
2 CoreData 0x000000010ffe0fb0 -[NSManagedObject initWithEntity:insertIntoManagedObjectContext:] + 528
3 StudyHub 0x000000010edee13c _TFC8StudyHub11UserDetailscfT6entityCSo19NSEntityDescription10insertIntoGSqCSo22NSManagedObjectContext__S0_ + 76
4 StudyHub 0x000000010edee212 _TToFC8StudyHub11UserDetailscfT6entityCSo19NSEntityDescription10insertIntoGSqCSo22NSManagedObjectContext__S0_ + 66
5 CoreData 0x0000000110082d79 -[NSManagedObject initWithContext:] + 793
6 StudyHub 0x000000010ed05dd4 _TTOFCSo15NSManagedObjectcfT7contextCSo22NSManagedObjectContext_S_ + 36
7 StudyHub 0x000000010ed0211c _TFCSo15NSManagedObjectCfT7contextCSo22NSManagedObjectContext_S_ + 76
8 StudyHub 0x000000010ed009e5 _TFFC8StudyHub11AppDelegate11applicationFTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVs10DictionaryVSC29UIApplicationLaunchOptionsKeyP____SbL_15saveUserDetailsFT4dataGS2_SSSS__T_ + 421
9 StudyHub 0x000000010ed02837 _TFFC8StudyHub11AppDelegate11applicationFTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVs10DictionaryVSC29UIApplicationLaunchOptionsKeyP____SbU1_FCSo15FIRDataSnapshotT_ + 1607
10 StudyHub 0x000000010ed0290c _TTRXFo_oCSo15FIRDataSnapshot__XFdCb_dS___ + 60
11 StudyHub 0x000000010eedb4af __43-[FValueEventRegistration fireEvent:queue:]_block_invoke.57 + 78
12 libdispatch.dylib 0x0000000115df3978 _dispatch_call_block_and_release + 12
13 libdispatch.dylib 0x0000000115e1d0cd _dispatch_client_callout + 8
14 libdispatch.dylib 0x0000000115dfd8a4 _dispatch_main_queue_callback_4CF + 406
15 CoreFoundation 0x0000000114f66e49 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
16 CoreFoundation 0x0000000114f2c37d __CFRunLoopRun + 2205
17 CoreFoundation 0x0000000114f2b884 CFRunLoopRunSpecific + 420
18 GraphicsServices 0x0000000117ba4a6f GSEventRunModal + 161
19 UIKit 0x00000001131bfc68 UIApplicationMain + 159
20 StudyHub 0x000000010ed04d4f main + 111
21 libdyld.dylib 0x0000000115e6968d start + 1
22 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
推荐答案
尝试改变:
let container = NSPersistentContainer(name: "DELETE")
为此:
let container = NSPersistentContainer(name: "StudyHub")
根据文档:
默认情况下，提供的名称值用于命名持久存储，并用于查找与 NSPersistentContainer 对象一起使用的 NSManagedObjectModel 对象的名称.
By default, the provided name value is used to name the persistent store and is used to look up the name of the NSManagedObjectModel object to be used with the NSPersistentContainer object.
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