There are occasions when you want to do more than the built in CRUD routing provided by Filament.

For this example you might want to create a Modules and Course builder and need the module ID in the create course page.

// CourseModuleResource
public static function getPages(): array
{
    return [
        'index'           => ListModules::route('/'),
        'create'          => CreateModule::route('/create'),
        'edit'            => EditModule::route('/{record}/edit'),
        'modules'         => ListModules::route('/{record}'),
        // Adding a new route for the create page passing in the ID of the parent record
        'modules.create'  => CreateModule::route('/{record}/create'),
    ];
}

// CourseModuleResource List Page
class ListModules extends ListRecords
{
    protected static string $resource = CourseModuleResource::class;
 
    protected function getActions(): array
    {
        // Get last segment which is the ID of the resource.
        $record = request()?->segment(count(request()?->segments()));
 
        return [
            Actions\CreateAction::make()->url(fn (): string => url('admin/courses/modules/' . $record . '/create')),
        ];
    }
}