code: protected function generateKanbanView($dir)
      {
          $this->renderFile('crud/views/kanban.html.twig.twig', $dir.'/kanban.html.twig', array(
              'bundle'            => $this->bundle->getName(),
              'entity'            => $this->entity,
              'fields'            => $this->metadata->fieldMappings,
              'actions'           => $this->actions,
              'route_prefix'      => $this->routePrefix,
              'route_name_prefix' => $this->routeNamePrefix,
          ));
      }
docs: Generates the show.html.twig template in the final bundle.
  
  @param string $dir The path to the folder that hosts templates in the bundle