coredata访问数据关系错误

我有coredata项目这里是我的.h文件：

@interface Content : NSManagedObject @property (nonatomic, retain) NSString * title; @property (nonatomic, retain) NSString * body; @property (nonatomic, retain) Categories *category; @property (nonatomic, retain) NSSet *tags; @end @interface Content (CoreDataGeneratedAccessors) - (void)addTagsObject:(Tags *)value; - (void)removeTagsObject:(Tags *)value; - (void)addTags:(NSSet *)values; - (void)removeTags:(NSSet *)values; 

我正在填充我的coredata，如下所示：

  NSError *error = nil; // Categories: NSManagedObjectContext *moc = [self managedObjectContext]; NSEntityDescription *contentDescription = [ NSEntityDescription entityForName:@"Categories" inManagedObjectContext:moc]; NSFetchRequest *categoRequest = [NSFetchRequest new]; categoRequest.entity = contentDescription; NSPredicate *categoPredicate = [NSPredicate predicateWithFormat:@"category like %@", _dropMenuOulet.stringValue]; categoRequest.predicate = categoPredicate; NSArray *results = [moc executeFetchRequest:categoRequest error:&error]; Categories *catego = (Categories*) [results objectAtIndex:0]; // Tags: NSEntityDescription *tagsDescription = [ NSEntityDescription entityForName:@"Tags" inManagedObjectContext:moc]; NSFetchRequest *tagsRequest = [NSFetchRequest new]; tagsRequest.entity = tagsDescription; NSArray *tagsResults = [moc executeFetchRequest:tagsRequest error:&error]; Content *content1 = [NSEntityDescription insertNewObjectForEntityForName:@"Content" inManagedObjectContext:moc]; content1.category = catego; content1.title = _titleOutlet.stringValue; content1.body = _bodyOutlet.stringValue; NSMutableSet *tagSet = [NSMutableSet set]; for (NSManagedObject *obj in tagsResults) { [tagSet addObject:obj]; } content1.tags = tagSet; 

我现在的问题是当我尝试访问内容中的标签时，我得到以下内容：

 tags = "<relationship fault: 0x60000002d820 'tags'>"; 

如何访问内容的标签？

Answer 1

我想通过不同的方式来做这件事：

 NSError *error = nil; NSManagedObjectContext *moc = [self managedObjectContext]; NSEntityDescription *contentDescription = [ NSEntityDescription entityForName:@"Content" inManagedObjectContext:moc]; NSFetchRequest *contentRequest = [NSFetchRequest new]; contentRequest.entity = contentDescription; NSArray *results = [moc executeFetchRequest:contentRequest error:&error]; NSLog(@"results content %@",results); Content *myCont = [results objectAtIndex:0]; NSLog(@"list of tags %@", [[myCont tags] valueForKey:@"tag"]);