我該如何解決NSInternalInconsistencyException '原因是：' + entityForName：故障報告

Question

我的代碼看起來像這樣：

NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext]; 
     NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity]; 
     NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; 

     // If appropriate, configure the new managed object. 
     [newManagedObject setValue:[NSDate date] forKey:@"date"]; 

      // Save the context. 
      NSError *error = nil; 
      if (![context save:&error]) { 
       NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
       abort(); 
     } 

在.h頭文件中我有這樣的：

@interface TretiViewController : UIViewController <NSFetchedResultsControllerDelegate> { 

NSFetchedResultsController *fetchedResultsController_; 
    NSManagedObjectContext *managedObjectContext_; 

// private NSString *accountID; 
} 


@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext; 
@property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController; 

應該保存數據使用核心數據但錯誤：

NavTest[1372:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Obrat'' 
*** Call stack at first throw: 
(
0 CoreFoundation      0x00f92be9 __exceptionPreprocess + 185 
1 libobjc.A.dylib      0x010e75c2 objc_exception_throw + 47 
2 CoreData       0x00cbf45b +[NSEntityDescription entityForName:inManagedObjectContext:] + 187 
3 NavTest        0x0000c210 -[TretiViewController fetchedResultsController] + 187 
4 NavTest        0x00007a76 -[TretiViewController ukazObrat0] + 38 
5 UIKit        0x002c4a6e -[UIApplication sendAction:to:from:forEvent:] + 119 
6 UIKit        0x003531b5 -[UIControl sendAction:to:forEvent:] + 67 
7 UIKit        0x00355647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
8 UIKit        0x00354438 -[UIControl touchesBegan:withEvent:] + 277 
9 UIKit        0x0054f987 _UIGestureRecognizerSortAndSendDelayedTouches + 3609 
10 UIKit        0x005500fc _UIGestureRecognizerUpdateObserver + 927 
11 CoreFoundation      0x00f73fbb __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27 
12 CoreFoundation      0x00f090e7 __CFRunLoopDoObservers + 295 
13 CoreFoundation      0x00ed1bd7 __CFRunLoopRun + 1575 
14 CoreFoundation      0x00ed1240 CFRunLoopRunSpecific + 208 
15 CoreFoundation      0x00ed1161 CFRunLoopRunInMode + 97 
16 GraphicsServices     0x018c7268 GSEventRunModal + 217 
17 GraphicsServices     0x018c732d GSEventRun + 115 
18 UIKit        0x002d342e UIApplicationMain + 1160 
19 NavTest        0x00002594 main + 102 
20 NavTest        0x00002525 start + 53 
) 

in NavTest.xcdatamodel我有兩個entyti s默認爲attributes和Evet。

- (NSFetchedResultsController *)fetchedResultsController { 

    if (fetchedResultsController_ != nil) { 
     return fetchedResultsController_; 
    } 


    // Set up the fetched results controller. 

    // Create the fetch request for the entity. 
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
    // Edit the entity name as appropriate. 
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Obrat" inManagedObjectContext:self.managedObjectContext]; 
    [fetchRequest setEntity:entity]; 

    // Set the batch size to a suitable number. 
    [fetchRequest setFetchBatchSize:20]; 

    // Edit the sort key as appropriate. 
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO]; 
    NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; 

    [fetchRequest setSortDescriptors:sortDescriptors]; 

    // Edit the section name key path and cache name if appropriate. 
    // nil for section name key path means "no sections". 
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"]; 
    aFetchedResultsController.delegate = self; 
    self.fetchedResultsController = aFetchedResultsController; 

    [aFetchedResultsController release]; 
    [fetchRequest release]; 
    [sortDescriptor release]; 
    [sortDescriptors release]; 

    NSError *error = nil; 
    if (![fetchedResultsController_ performFetch:&error]) { 

// Replace this implementation with code to handle the error appropriately. 

// abort() 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. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button. 

    NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
    abort(); 
    } 

    return fetchedResultsController_; 
    }  

我錯過了什麼？

Answer 1

更改代碼fetchedResultsController：

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Obrat" inManagedObjectContext:self.managedObjectContext]; 

到

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Obrta" inManagedObjectContext:self.managedObjectContext]; 

您在Xcode創建必須在你的代碼保持相同與NSEntityDescription

Answer 2

你說你有一個名爲"Obrta"的實體，但代碼要創建"Obrat"類型的對象。修復這個錯字可以解決你的問題。