Custom route bindings

Did you know you can define custom route bindings in Laravel?

In this example, I need to resolve a portfolio by slug. But the slug is not unique, because multiple users can have a portfolio named 'Foo'

So I define how Laravel should resolve them from a route parameter

class RouteServiceProvider extends ServiceProvider
{
    public const HOME = '/dashboard';
 
    public function boot()
    {
        Route::bind('portfolio', function (string $slug) {
            return Portfolio::query()
                ->whereBelongsto(request()->user())
                ->whereSlug($slug)
                ->firstOrFail();
        });
    }
}

Route::get('portfolios/{portfolio}', function (Portfolio $portfolio) {
    /*
     * The $portfolio will be the result of the query defined in the RouteServiceProvider
     */
})

Tip given by @mmartin_joo