考虑这个模型:@classPatient;@interfaceHospital:NSManagedObject@property(nonatomic,retain)NSString*name;@property(nonatomic,retain)NSNumber*patientCount;@property(nonatomic,retain)NSSet*patients;@end@interfaceHospital(CoreDataGeneratedAccessors)-(void)addPatientsObject:(Patient*)value;-(void)removePatie