public QueryBase::notExists($property, $langcode = NULL)
Queries for an empty field.
$field.: Name of a field.
$langcode: Language code (optional).
\Drupal\Core\Entity\Query\QueryInterface
Overrides QueryInterface::notExists
public function notExists($property, $langcode = NULL) { $this->condition->notExists($property, $langcode); return $this; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryBase.php/function/QueryBase::notExists/8.1.x