I want to print file size near file link in file-link.html.twig template. To do so I need something like {{ filesize }} variable avaiable in template.

I tried to override template_preprocess_file_link() with an override function in mytheme.theme like mytheme_preprocess_file_link() but I get this error:

The website encountered an unexpected error. Please try again later.
Error: Class 'File' not found in tofacile_preprocess_file_link() (line 12 of themes/custom/mytheme/mytheme.theme)

It seems like a class missing... should I add "use Drupal\File\SomethingXXX" declaration??


This is my code:


 * @file
 * Functions to support theming in the Tofacile theme.

function tofacile_preprocess_file_link(&$variables){
  $file = $variables['file'];
  $options = [];
  $file_entity = $file instanceof File ? $file : File::load($file->fid);

  // @todo Wrap in file_url_transform_relative(). This is currently
  // impossible. As a work-around, we currently add the 'url.site' cache context
  // to ensure different file URLs are generated for different sites in a
  // multisite setup, including HTTP and HTTPS versions of the same site.
  // Fix in https://www.drupal.org/node/2646744.
  $url = file_create_url($file_entity
  $variables['#cache']['contexts'][] = 'url.site';
  $mime_type = $file

  // Set options as per anchor format described at
  // http://microformats.org/wiki/file-format-examples
  $options['attributes']['type'] = $mime_type . '; length=' . $file

  // Use the description as the link text if available.
  if (empty($variables['description'])) {
    $link_text = $file_entity
  else {
    $link_text = $variables['description'];
    $options['attributes']['title'] = $file_entity

  // Classes to add to the file field for icons.
  $classes = [
    // Add a specific class for each and every mime type.
    'file--mime-' . strtr($mime_type, [
      '/' => '-',
      '.' => '-',
    // Add a more general class for groups of well known MIME types.
    'file--' . file_icon_class($mime_type),

  // Set file classes to the options array.
  $variables['attributes'] = new Attribute($variables['attributes']);
  $variables['link'] = \Drupal::l($link_text, Url::fromUri($url, $options));
  • Did you import File class to your theme?? – lamp5 Mar 20 '18 at 12:04

Yes, seems you need to add:

use Drupal\file\Entity\File;

to the begin of your mytheme.theme file. You can also do something like:

$file_entity = $file instanceof \Drupal\file\Entity\File ? $file : 

And you will have the same problem with Attribute and Url. You need to import the classes with the complet namespace in your file. https://secure.php.net/manual/en/language.namespaces.importing.php

| improve this answer | |
  • 1
    Finally I added these three lines and it works: - use \Drupal\file\Entity\File; - use \Drupal\Core\Template\Attribute; - use \Drupal\Core\Url; – Charly71 Mar 21 '18 at 13:40

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