insertNewObjectForEntityForName无法找到实体(Swift) [英] insertNewObjectForEntityForName could not locate entity (Swift)
问题描述
我正在尝试将可工作的CoreData应用程序移植到Swift.此代码失败:
I am trying to port a working CoreData application to Swift. This code fails:
let moc = self.context
NSLog("Entities: \(moc.persistentStoreCoordinator.managedObjectModel.entitiesByName.allKeys)")
let obj = NSEntityDescription.insertNewObjectForEntityForName("School",
inManagedObjectContext:moc)
NSLog的输出是这样的:
2014-06-11 11:23:51.634 WYBData[18480:303] Entities [Address, Contact, Hospital, Person, Place, School]
因此，即使日志表明存在名为School的实体(我认为这表示NSManagedObjectContext的设置正确)，我仍然会收到此错误:
So even though the log indicates there is an entity called School, which I assume means the NSManagedObjectContext is correctly set up, I still get this error:
2014-06-11 11:23:55.338 WYBData[18480:303] +entityForName: could not locate an entity named 'School' in this model.
2014-06-11 11:23:55.340 WYBData[18480:303] (
0 CoreFoundation 0x00007fff8c05725c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff8f274e75 objc_exception_throw + 43
2 CoreData 0x00007fff89b20a19 +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 201
3 WYBData 0x00000001000171f3 _TFC7WYBData12WYBXmlParser7executefS0_FRGSqCSo7NSError_Sb + 2403
4 WYBData 0x000000010000ea4a _TFC7WYBData11WYBMainView2gofS0_FPSs9AnyObject_T_ + 1642
5 WYBData 0x000000010000ead2 _TToFC7WYBData11WYBMainView2gofS0_FPSs9AnyObject_T_ + 66
6 AppKit 0x00007fff91d97260 -[NSApplication sendAction:to:from:] + 327
7 AppKit 0x00007fff91d970de -[NSControl sendAction:to:] + 86
8 AppKit 0x00007fff91de3c4d -[NSCell _sendActionFrom:] + 128
9 AppKit 0x00007fff91dfd655 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 2316
10 AppKit 0x00007fff91dfca27 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 487
11 AppKit 0x00007fff91dfc13d -[NSControl mouseDown:] + 706
12 AppKit 0x00007fff91d7da58 -[NSWindow sendEvent:] + 11296
13 AppKit 0x00007fff91d1c5d4 -[NSApplication sendEvent:] + 2021
14 AppKit 0x00007fff91b6ca19 -[NSApplication run] + 646
15 AppKit 0x00007fff91b577a3 NSApplicationMain + 940
16 WYBData 0x000000010000a9ed top_level_code + 109
17 WYBData 0x000000010000aa2a main + 42
18 libdyld.dylib 0x00007fff8bf085fd start + 1
19 ??? 0x0000000000000003 0x0 + 3
)
我可以正确创建一个Address实体，但不能创建其他任何实体.甚至这很奇怪，因为Address是Contact的子实体，但是尝试创建Contact会导致上面的相同错误.
I can correctly create an Address entity, but none of the others. Even this is strange because Address is a sub-entity of Contact yet attempting to create Contact results in the same error above.
我想念什么?
我暂时从核心数据模型中删除了Address，现在可以创建Contact了，但是没有别的了.因此，看来我只能创建模型中定义的第一个实体(按字母顺序).这听起来像是错误，还是我的NSManagedObjectModel可能以某种方式损坏了?
I temporarily removed Address from my Core Data model, and can now create Contact but nothing else. So it seems that I can only create whatever is the first entity (alphabetically) defined in the model. Does this sound like a bug, or could my NSManagedObjectModel be corrupted somehow?
推荐答案
对于遇到相同问题的其他任何人:问题是我的.xcdatamodeld文件.它一定已经损坏了，因为我创建了一个新文件并完全重新创建了我的数据模型，现在它可以工作了.我看不到两个文件之间的任何区别(至少在Xcode Core Data模型编辑器中).
For anyone else who encounters the same problem: the issue was my .xcdatamodeld file. It must have been corrupted somehow because I created a new file and exactly re-created my data model and now it works. I cannot see any difference between the two files (at least in the Xcode Core Data model editor).
我的数据模型在iOS和OS-X项目之间共享(OS-X应用程序为iOS应用程序准备数据).我想知道为iOS创建的.xcdatamodeld文件与OS-X是否有任何区别.
My data model is shared between an iOS and OS-X project (the OS-X application prepares the data for the iOS app). I wondered if there was any difference in the .xcdatamodeld files created for iOS compared with OS-X.
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