Model relation question

Hello i am pretty new to phalcon and have not a question about the models. I have the following tables:

User Table:

    +----+-----+
    | id | name  
    +----+-----+
    |  1 | User1   
    |  2 | User2  
    |  3 | User3
    +----+-----+

UserRole Table:

    +----+-----+
    | userid | roleid  
    +----+-----+
    |  1 | 1   
    |  1 | 2  
    |  2 | 1  
    |  3 | 2
    +----+-----+

Roles Table:

    +----+-----+
    | id | name  
    +----+-----+
    |  1 | Role1   
    |  2 | Role2  
    +----+-----+

Now i can collect all Roles of the User like this. Its working.

$res =$user->findFirst()->getUserRoles();
        foreach($res as $userRole){
            var_dump($userRole->getRole()->getName());
        }

But i am wondering if thats the correct way or if its also possible to get the Roles directly? like : Or is that only possible if i write my own method in the User Model class?

    $user->findFirst()->getRoles();

Thanks for your advice. Patrick