假设我有一个Podcast实体，它有很多剧集，我很困惑其中哪一个是剔除和排序的首选选项://Alwaysworkwiththerelationshipproperty-(NSSet*)unfinishedEpisodes{NSArray*episodes=self.episodes.allObjects;NSPredicate*predicate=[NSPredicatepredicateWithBlock:^BOOL(PodcastEpisode*episode,NSDictionary*bindings){return!episode.isFinished;}];NSArray*u