Edit file File name : 20171228151841_WpYoastPrimaryTerm.php Content :<?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' ); } } Save