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Edit File: 20171228151841_WpYoastPrimaryTerm.php

<?php

namespace Yoast\WP\SEO\Config\Migrations;

use Yoast\WP\Lib\Migrations\Migration;
use Yoast\WP\Lib\Model;

/**
 * Migration for the Primary Term.
 */
class WpYoastPrimaryTerm extends Migration {

/**
	 * The plugin this migration belongs to.
	 *
	 * @var string
	 */
	public static $plugin = 'free';

/**
	 * Migration up.
	 *
	 * @return void
	 */
	public function up() {
		$table_name = $this->get_table_name();

$indexable_table = $this->create_table( $table_name );

$indexable_table->column(
			'post_id',
			'integer',
			[
				'unsigned' => true,
				'null'     => false,
				'limit'    => 11,
			],
		);
		$indexable_table->column(
			'term_id',
			'integer',
			[
				'unsigned' => true,
				'null'     => false,
				'limit'    => 11,
			],
		);
		$indexable_table->column(
			'taxonomy',
			'string',
			[
				'null'  => false,
				'limit' => 32,
			],
		);

// Executes the SQL to create the table.
		$indexable_table->finish();

$this->add_index(
			$table_name,
			[
				'post_id',
				'taxonomy',
			],
			[
				'name' => 'post_taxonomy',
			],
		);

$this->add_index(
			$table_name,
			[
				'post_id',
				'term_id',
			],
			[
				'name' => 'post_term',
			],
		);

$this->add_timestamps( $table_name );
	}

/**
	 * Migration down.
	 *
	 * @return void
	 */
	public function down() {
		$this->drop_table( $this->get_table_name() );
	}

/**
	 * Retrieves the table name to use.
	 *
	 * @return string Table name to use.
	 */
	protected function get_table_name() {
		return Model::get_table_name( 'Primary_Term' );
	}
}

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