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<?php 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 Indexable|null */ protected $indexable = null; /** * Returns the indexable this extension belongs to. * * @return Indexable The indexable. */ public function indexable() { if ( $this->indexable === null ) { $this->indexable = $this->belongs_to( 'Indexable', 'indexable_id', 'id' )->find_one(); } return $this->indexable; } }