想利用一个Coredata 的Model 但又不想写入数据库

gistfile1.m

//http://stackoverflow.com/questions/3868514/is-there-a-way-to-instantiate-a-nsmanagedobject-without-inserting-it


NSEntityDescription *entity = [NSEntityDescription entityForName:@"Transaction" inManagedObjectContext:self.managedObjectContext];
transaction = (Transaction *)[[NSManagedObject alloc] initWithEntity:entity insertIntoManagedObjectContext:nil];