<?php /** * Yoast SEO Plugin File. * * @package Yoast\YoastSEO\Models */ namespace Yoast\WP\SEO\Models; use Yoast\WP\Lib\Model; /** * Abstract class for indexable extensions. */ abstract class Indexable_Extension extends Model { /** * Holds the Indexable instance. * * @var \Yoast\WP\SEO\Models\Indexable */ protected $indexable = null; /** * Returns the indexable this extension belongs to. * * @return \Yoast\WP\SEO\Models\Indexable The indexable. */ public function indexable() { if ( $this->indexable === null ) { $this->indexable = $this->belongs_to( 'Indexable', 'indexable_id', 'id' )->find_one(); } return $this->indexable; } }