Stored Procedure Laravel

It would be something similar to the following code:

$user = new User();
$user->name = "Paco"
$user->save(); // A partir de aqui User , ya tiene un id asociado

// Suponemos que usuarios --------> 1:N ---------> logs
// Por consiguiente desde User establecemos hasMany y desde Logs una belongsTo
$log = new Log();
$log->user->associate($user);
$log->save();

Once we save, automatically the object that we use to save, has already associated a new id in the database, what we have to do in the new relation of the new object.

We have to notice that we can not save an object as logs if in the database we do not have before user since we have the problem that there is no id that identifies it and above we have a problem in the consistency of the database.