public ExtendableInterface::extend($extender_name)
Enhance this object by wrapping it in an extender object.
$extender_name: The fully-qualified name of the extender class, without the leading '\' (for example, Drupal\my_module\myExtenderClass). The extender name will be checked against the current database connection to allow driver-specific subclasses as well, using the same logic as the query objects themselves.
\Drupal\Core\Database\Query\ExtendableInterface The extender object, which now contains a reference to this object.
public function extend($extender_name);
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!ExtendableInterface.php/function/ExtendableInterface::extend/8.1.x