Post.php
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<?php
namespace ACP\Export\Strategy;
use AC;
use ACP\Export\Strategy;
use WP_Query;
/**
* Exportability class for posts list screen
* @property AC\ListScreenPost $list_screen
*/
class Post extends Strategy {
public function __construct( AC\ListScreenPost $list_screen ) {
parent::__construct( $list_screen );
}
protected function ajax_export(): void {
add_action( 'pre_get_posts', [ $this, 'modify_posts_query' ], 16 );
add_filter( 'the_posts', [ $this, 'catch_posts' ], 10, 2 );
add_filter( 'posts_clauses', [ $this, 'filter_ids' ], 10, 2 );
}
public function filter_ids( $clauses, WP_Query $query ) {
global $wpdb;
if ( ! $query->is_main_query() ) {
return $clauses;
}
$ids = $this->get_requested_ids();
if ( $ids ) {
$clauses['where'] .= sprintf( "\nAND $wpdb->posts.ID IN( %s )", implode( ',', $ids ) );
}
return $clauses;
}
/**
* Modify the main posts query to use the correct pagination arguments. This should be attached
* to the pre_get_posts hook when an AJAX request is sent
*
* @param WP_Query $query
*
* @since 1.0
* @see action:pre_get_posts
*/
public function modify_posts_query( $query ) {
if ( $query->is_main_query() ) {
$per_page = $this->get_num_items_per_iteration();
$query->set( 'nopaging', false );
$query->set( 'offset', $this->get_export_counter() * $per_page );
$query->set( 'posts_per_page', $per_page );
$query->set( 'posts_per_archive_page', $per_page );
$query->set( 'fields', 'all' );
}
}
/**
* Run the actual export when the posts query is finalized. This should be attached to the
* the_posts filter when an AJAX request is run
*
* @param array $posts
* @param WP_Query $query
*
* @return array
*/
public function catch_posts( $posts, WP_Query $query ) {
if ( $query->is_main_query() ) {
$this->export( wp_list_pluck( $posts, 'ID' ) );
}
return $posts;
}
}