Code snippet that can be used to disable caching for a block in Drupal 8.
use $vars['#cache']['max-age'] = 0 to stop block being cache in drupal 8.
/**
* Implements hook_preprocess_HOOK()
*/
function mytheme_preprocess_block(&$vars) {
if($vars['derivative_plugin_id'] == 'block-id-name') {
$vars['#cache']['max-age'] = 0;
}
}
for custom Block you can use getCacheMaxAge() method like this:
class MyModuleBlock extends BlockBase {
/**
* {@inheritdoc}
*/
public function build() {
}
/**
* @return int
*/
public function getCacheMaxAge() {
return 0;
}
}
Also you can use \Drupal::service('page_cache_kill_switch')->trigger(); to disable the cache for anonymous users and all others too.
Example:
function fest_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {
if ($form_id == "node_something_form") {
//disable the form cache for anonymous users and all others too
\Drupal::service('page_cache_kill_switch')->trigger();
}
}
