After moving a module to another folder , i cannot clear reminiscent module paths

Question

I have moved the contrib module pagerer from

/sites/my_site/modules

to

/modules/contrib

It breaks the site as some files are unaccessible

/platforms/drupal8-development/sites/recherche-dev.univ-amu.fr/modules/pagerer/src/Entity/PagererPreset.php): failed to open stream: No such file or directory in require()

i guess i would need to perform a registry rebuild but i don't know how.

drush rr outputs

The drush command 'rr' could not be found

Answer 1

i have ended up putting in local.settings.php

   /**
 * Class Loader.
 *
 * If the APC extension is detected, the Symfony APC class loader is used for
 * performance reasons. Detection can be prevented by setting
 * class_loader_auto_detect to false, as in the example below.
 */
$settings['class_loader_auto_detect'] = FALSE;

Answer 2

Drupal stores a cached version of the container at the cache_container table. This table contains, among other things, the list of module paths.

For most cases running drush cr should be enough but if you see that even drush cr crashes then you will need to create a database update like this in an already installed module:

/**
 * Clears all caches after moving modules from modules to modules/contrib.
 */
function mymodule_update_8100(&$sandbox) {
  drupal_flush_all_caches();
}

And then run drush updb -y.