使用IBAction爲插入數據引發異常

Question

我想創建一個按鈕，即「完成」，當按下時，所有的數據保存到核心數據，我使用下面

- (IBAction)done:(id)sender 
{ 

    // Create a new instance of the entity managed by the fetched results controller. 
    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. 
    // Normally you should use accessor methods, but using KVC here avoids the need to add a custom class to the template. 

    NSString *name = _nameField.text; 
    NSString *amount = _amountField.text; 

    [newManagedObject setValue:[NSDate date] forKey:@"date"]; 
    [newManagedObject setValue:name forKey:@"name"]; 
    [newManagedObject setValue:amount forKey:@"amount"]; 
    [newManagedObject setValue:category forKey:@"category"]; 

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

的代碼，這是牽強結果控制器：

#pragma mark - fetchedResultsController 

- (NSFetchedResultsController *)fetchedResultsController { 

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

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
    NSEntityDescription *entity = [NSEntityDescription 
            entityForName:@"Item" inManagedObjectContext:managedObjectContext]; 
    [fetchRequest setEntity:entity]; 

    NSSortDescriptor *sort = [[NSSortDescriptor alloc] 
           initWithKey:@"date" ascending:NO]; 
    [fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]]; 

    [fetchRequest setFetchBatchSize:20]; 

    NSFetchedResultsController *theFetchedResultsController = 
    [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest 
             managedObjectContext:managedObjectContext sectionNameKeyPath:nil 
                cacheName:@"Root"]; 
    self.fetchedResultsController = theFetchedResultsController; 
    //_fetchedResultsController.delegate = self; 

    return _fetchedResultsController; 

} 

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller { 
    // The fetch controller is about to start sending change notifications, so prepare the table view for updates. 
    [self.tableView beginUpdates]; 
} 


- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath { 

    UITableView *tableView = self.tableView; 

    switch(type) { 

     case NSFetchedResultsChangeInsert: 
      [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; 
      break; 

     case NSFetchedResultsChangeDelete: 
      [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
      break; 

     case NSFetchedResultsChangeUpdate: 
      [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath]; 
      break; 

     case NSFetchedResultsChangeMove: 
      [tableView deleteRowsAtIndexPaths:[NSArray 
               arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
      [tableView insertRowsAtIndexPaths:[NSArray 
               arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; 
      break; 
    } 
} 


- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type { 

    switch(type) { 

     case NSFetchedResultsChangeInsert: 
      [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade]; 
      break; 

     case NSFetchedResultsChangeDelete: 
      [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade]; 
      break; 
    } 
} 


- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { 
    // The fetch controller has sent all current change notifications, so tell the table view to process all updates. 
    [self.tableView endUpdates]; 
} 

我得到了錯誤：

2012-05-13 11:26:08.341 test[818:fb03] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Item''

但我有檢查實體名稱和NSManagedObject蘇bclass和他們在代碼

我試圖清理和重建和重置模擬器，但沒有奏效

Answer 1

嘗試刪除從模擬器的應用，清潔並重建