hook_views_pre_execute(ViewExecutable $view)
Act on the view after the query is built and just before it is executed.
Output can be added to the view by setting $view->attachment_before and $view->attachment_after.
\Drupal\views\ViewExecutable $view: The view object about to be processed.
function hook_views_pre_execute(ViewExecutable $view) { // Whenever a view queries more than two tables, show a message that notifies // view administrators that the query might be heavy. // (This action could be performed later in the execution process, but not // earlier.) $account = \Drupal::currentUser(); if (count($view->query->tables) > 2 && $account->hasPermission('administer views')) { drupal_set_message(t('The view %view may be heavy to execute.', array('%view' => $view->name)), 'warning'); } }
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https://api.drupal.org/api/drupal/core!modules!views!views.api.php/function/hook_views_pre_execute/8.1.x