hello,

There are two way inheriting from NSManagedObject!!!

Car *car = [[Car alloc] initWithEntity:[NSEntityDescription entityForName:@"Car"                                          inManagedObjectContext:self.managedObjectContext]
               insertIntoManagedObjectContext:self.managedObjectContext];

or

Car *car = [NSEntityDescription insertEntityWithName@"Car" inManagedObjectContext

:self.managedObjectContext]