WeatherObservation我是数据模型中的一个实体,我试图将它与另一个Object(一对一)的关系设置为我通过导航控制器传递的.几个星期前就有用了.我更改了模型中的一些其他实体,重新生成了类,并将此关系设置为NSManagedObject,而不是另一个实体的类.我尝试重新生成这个类几次,然后将其更改为应该是什么,并将类添加到.h,#import到.m
我假设[MANAGEDOBJECT count]消息是核心数据魔法的一部分,我不会在我的代码中的任何地方调用它.我不知道从哪里开始,该怎么做,我可以在这里发布什么来帮助得到答案?我试过了:
weather.hiveObservation = hiveObs;
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以及
[weather setValue:hiveObs forKey:@"hiveObservation"]
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两个都抛出相同的错误,如果我注释掉设置对象保存到持久存储的关系.hiveObs是在旧视图中创建的,但尚未保存...如果这很重要?
编辑:经过思考和添加信息.
我传入的ManagedObject已创建,但在更改视图之前未保存.它在新视图中使用nil值记录,但这可能是问题吗?
核心数据文件
HiveObservation.h
import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@class BoxObservation, HiveDetails, WeatherObservation;
@interface HiveObservation : NSManagedObject
... //other properties omitted
@property (nonatomic, retain) HiveDetails *hiveDetail;
@property (nonatomic, retain) WeatherObservation *weatherObservation;
@end
@interface HiveObservation (CoreDataGeneratedAccessors)
- (void)addBoxObservationsObject:(BoxObservation *)value;
- (void)removeBoxObservationsObject:(BoxObservation *)value;
- (void)addBoxObservations:(NSSet *)values;
- (void)removeBoxObservations:(NSSet *)values;
@end
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WeatherObservation.h
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@class HiveObservation;
@interface WeatherObservation : NSManagedObject
//... other properties omitted
@property (nonatomic, retain) NSNumber * windSpeed;
@property (nonatomic, retain) HiveObservation *hiveObservation;
@end
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控制台输出:
2015-01-21 14:28:32.739 Hive Maps[5085:69277] -[WeatherObservation count]: unrecognized selector sent to instance 0x78ea3140
2015-01-21 14:28:32.743 Hive Maps[5085:69277] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[WeatherObservation count]: unrecognized selector sent to instance 0x78ea3140'
*** First throw call stack:
(
0 CoreFoundation 0x0157b946 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x01204a97 objc_exception_throw + 44
2 CoreFoundation 0x015835c5 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x014cc3e7 ___forwarding___ + 1047
4 CoreFoundation 0x014cbfae _CF_forwarding_prep_0 + 14
5 CoreData 0x00b2a8cc -[NSSQLCore _knownOrderKeyForObject:from:inverseToMany:] + 204
6 CoreData 0x00b2ae53 -[NSSQLCore _populateRow:fromObject:timestamp:inserted:] + 1043
7 CoreData 0x00a52e73 -[NSSQLCore prepareForSave:] + 1091
8 CoreData 0x00a52174 -[NSSQLCore saveChanges:] + 340
9 CoreData 0x00a1bfee -[NSSQLCore executeRequest:withContext:error:] + 638
10 CoreData 0x00b15af4 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 5380
11 CoreData 0x00b1ee9c gutsOfBlockToNSPersistentStoreCoordinatorPerform + 188
12 libdispatch.dylib 0x02d00e2f _dispatch_client_callout + 14
13 libdispatch.dylib 0x02ce5505 _dispatch_barrier_sync_f_invoke + 144
14 libdispatch.dylib 0x02ce4c37 dispatch_barrier_sync_f + 105
15 CoreData 0x00b0f7e7 _perform + 183
16 CoreData 0x00a1bb1b -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 459
17 CoreData 0x00a4b1d9 -[NSManagedObjectContext save:] + 1529
18 Hive Maps 0x00018a6d -[GetWeatherTableViewController saveWeatherData:] + 3133
19 libobjc.A.dylib 0x0121a7cd -[NSObject performSelector:withObject:withObject:] + 84
20 UIKit 0x0193023d -[UIApplication sendAction:to:from:forEvent:] + 99
21 UIKit 0x01ca0840 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 139
22 libobjc.A.dylib 0x0121a7cd -[NSObject performSelector:withObject:withObject:] + 84
23 UIKit 0x0193023d -[UIApplication sendAction:to:from:forEvent:] + 99
24 UIKit 0x019301cf -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
25 UIKit 0x01a63e86 -[UIControl sendAction:to:forEvent:] + 69
26 UIKit 0x01a642a3 -[UIControl _sendActionsForEvents:withEvent:] + 598
27 UIKit 0x01a6350d -[UIControl touchesEnded:withEvent:] + 660
28 UIKit 0x0198060a -[UIWindow _sendTouchesForEvent:] + 874
29 UIKit 0x019810e5 -[UIWindow sendEvent:] + 791
30 UIKit 0x01946549 -[UIApplication sendEvent:] + 242
31 UIKit 0x0195637e _UIApplicationHandleEventFromQueueEvent + 20690
32 UIKit 0x0192ab19 _UIApplicationHandleEventQueue + 2206
33 CoreFoundation 0x0149f1df __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
34 CoreFoundation 0x01494ced __CFRunLoopDoSources0 + 253
35 CoreFoundation 0x01494248 __CFRunLoopRun + 952
36 CoreFoundation 0x01493bcb CFRunLoopRunSpecific + 443
37 CoreFoundation 0x014939fb CFRunLoopRunInMode + 123
38 GraphicsServices 0x04d0124f GSEventRunModal + 192
39 GraphicsServices 0x04d0108c GSEventRun + 104
40 UIKit 0x0192e8b6 UIApplicationMain + 1526
41 Hive Maps 0x0001967d main + 141
42 libdyld.dylib 0x02d2cac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
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我做了一个带有异常点的堆栈跟踪,当我保存时发生异常:
weather.hiveObservation = hiveObs;
NSError *error = nil;
if (![_managedObjectContext save:&error]) {
//Handle the error.
NSLog(@"SAVE ERROR: %@",error);
}
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Ris*_*kov 14
有同样的问题.清理和重建后仍出现错误.双重检查了关系,它确实是一对一,我仍然有同样的错误.
解决方案:删除"hiveObservation"关系和相应实体中的对应关系(如果存在),并添加具有相同名称的新关系.
我也遇到过这个错误:
-[SomeEntity count]:无法识别的选择器发送到实例 0x600000db2d00
这似乎仅发生在一对一关系中(这似乎是 Xcode 错误)
基本上,错误告诉我们count正在执行SomeEntity,因此我们需要找到该实体在我们的核心数据模型中用作关系的位置。
type为To-Manyorderedtype回原来的样子To-One如果您对核心数据模型进行更改,并且通过仅更改类型但将集合保留为 ,无意中将关系从 an 更改为 a ,则可能会出现这种情况。ordered to-manyto-onearrangementordered
Xcode 在此处出现错误,导致生成的 xml 保留可能决定其运行时行为的ordered属性设置YES,尤其是在保存上下文时。
根据记录,XML 条目如下所示:
多对多订购(正确):
<relationship name="foo" toMany="YES" ordered="YES" destinationEntity="SomeEntity" deletionRule="Nullify" syncable="YES"/>
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To-One(由于ordered保留属性而会导致本次崩溃的BUG):
<relationship name="foo" maxCount="1" ordered="YES" destinationEntity="SomeEntity" deletionRule="Nullify" syncable="YES"/>
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对一(正确):
<relationship name="foo" maxCount="1" destinationEntity="SomeEntity" deletionRule="Nullify" syncable="YES"/>
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这与删除关系并用相同的名称重新创建它的作用相同,但我认为有些人可能想知道确切的原因。
PS:我的 git 更改日志帮助我找到了这个。
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