ios难度fetchRequest FetchedResultController

Question

我无法为fetchedResultedController创建fetchRequest。

我有3个型号：

@interface Event : NSManagedObject
    @property (nonatomic, retain) Entertainment *entertainment;
    @property (nonatomic, retain) Place *place;
    @property (nonatomic, retain) NSDate * date;
    @property (nonatomic, retain) NSString * objectId;
    //boolValue
    @property (nonatomic, retain) NSNumber * threeDimensional;
    //others properties
    .......
@end


@interface Entertainment : NSManagedObject
    @property (nonatomic, retain) NSString * name;
    @property (nonatomic, retain) NSString * objectId;
    @property (nonatomic, retain) NSSet *events;
    @property (nonatomic, retain) NSString *classNaming;
    //others properties
    .......
@end


@interface Place : NSManagedObject
    @property (nonatomic, retain) NSString * name;
    @property (nonatomic, retain) NSString * objectId;
    @property (nonatomic, retain) NSSet *events;
    //others properties
    .......
@end

所以我需要在tableView（每行1个地方）显示具体日期（11月1日）和具体事件entertainment以及所有活动时间（示例事件可能有时间14:30） ，第二次19:10，所以我需要在单元格中显示所有这些时间以获取具体位置）

示例：

所以这并不困难

- (NSFetchedResultsController *)fetchedResultsControllerForEntertainmentsWithEventsFromEntertainment:(Entertainment *)entertainment 
date:(NSDate *)date
{
    if (!place && !date)
        return nil;
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass([Event class])];
    NSDateFormatter *dateFormatter = [NSDateFormatter new];
    dateFormatter.dateFormat = @"yyyy/MM/dd";
    NSDate *startDate = [dateFormatter dateFromString:[dateFormatter stringFromDate:date]];
    NSDateComponents *oneDay = [NSDateComponents new];
    oneDay.day = 1;
    NSDate *endDate = [[NSCalendar currentCalendar] dateByAddingComponents:oneDay toDate:startDate options:0];
    fetchRequest.predicate = [NSPredicate predicateWithFormat:@"date >= %@ AND date < %@ AND entertainment.classNaming == %@ AND entertainment.objectId == %@", startDate, endDate, entertainment.classNaming, entertainment.objectId];
    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"entertainment.name" ascending:YES selector:@selector(caseInsensitiveCompare:)];
    fetchRequest.sortDescriptors = @[sortDescriptor];
    fetchRequest.fetchBatchSize = 20;
    NSFetchedResultsController *fetchResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"place.name" cacheName:nil];
    return fetchResultsController;
}

所以我得到了fetchedResultsController，其中每个部分都是带有行数组的Place，每个部分都是这个Place的Event。

但我有一个大问题： 每个Event都可以3D显示（属性threeDimensional）。因此，如果Place有3D和非3D事件，则必须对其进行划分，因此一个单元格将显示场所的3D事件，另一个场景将显示非3D事件。我做了但没有fetchedResultsCntroller。我需要在fetchRequest中使用什么谓词来做这样的事情：