public FieldItemListInterface::preSave()
Defines custom presave behavior for field values.
This method is called during the process of saving an entity, just before item values are written into storage.
\Drupal\Core\Field\FieldItemInterface::preSave()
public function preSave();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemListInterface.php/function/FieldItemListInterface::preSave/8.1.x