Where is the right place to specify the function to form the URL?

Question

Slim Framework

Good afternoon.
I have a dilemma.
Where is the right place to specify the function to get the url of the model?
In many sources, the function is simply written in the template as path_for (router, parameters).
But I don't want to use this, I plan to add a slug and change the URL in the future.
Now it’s done in the model (Eloquent) through url (view on the site), url_admin_edit (edit url in the admin panel), but in this case the problem is that you have to write all the routers to the model and I can’t stick the url of adding a new entry to the model .
How to do it right?
Perhaps chaotically written