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<?php

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namespace Yoast\WP\SEO\Models;

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use Yoast\WP\Lib\Model;

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/**

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* Abstract class for indexable extensions.

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abstract class Indexable_Extension extends Model {

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/**

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* Holds the Indexable instance.

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* @var Indexable

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protected $indexable = null;

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/**

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* Returns the indexable this extension belongs to.

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* @return Indexable The indexable.

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public function indexable() {

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if ( $this->indexable === null ) {

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$this->indexable = $this->belongs_to( 'Indexable', 'indexable_id', 'id' )->find_one();

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}

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return $this->indexable;

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}

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}

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