How to generate NavigationItem from DB ?

   AppServiceProvider.php
    ...
    public function boot()
    {
        Filament::serving(function () {
            $menus = Menu::all()
                ->map(function ($menu) {
                    return  NavigationItem::make($menu->title)
                        ->url($menu->filamentResourceUrl)
                        ->icon($menu->filamentResourceIcon)
                        ->isActiveWhen(fn (): bool => request('menu') == $menu->id)
                        ->group($menu->filamentResourceMenuGroupLabel);
                    // ->sort(3);
                });

            Filament::registerNavigationItems([
                ...$menus->toArray(),
            ]);
        });
    }
    ...

Call to a member function connection() on null

class AdminPanelProvider extends PanelProvider
{

    public function panel(Panel $panel): Panel
    {
        return $panel
            ...
            ->navigationItems($this->populateNavigationItems())
    }



    private function populateNavigationItems()
    {
        return Menu::all()
            ->map(function ($menu) {

                    return NavigationItem::make($menu->title)
                        ->url(fn () => PostResource::getUrl(name: 'index', parameters: ['menu_id' => $menu->id]))
                        ->icon('heroicon-o-newspaper')
                        ->group('ข่าวสาร')
                        ->sort(3);
            })
            ->filter(fn ($menu) => !is_null($menu))
            ->toArray();
    }
}