Tell SearchWP to index Gmedia (Grand Media) Tags alongside Gmedia Albums

searchwp-customizations.php

<?php

// Add a SearchWP custom Custom Field to append Gmedia Media Tags to Gmedia Albums when
// indexing, making Gmedia Tags searchable, with Albums coming up for search results.
// @link https://wordpress.org/plugins/grand-media/
add_filter( 'searchwp\entry\data', function( $data, \SearchWP\Entry $entry ) {
	global $gmDB, $wpdb;

	if ( 'post' . SEARCHWP_SEPARATOR . 'gmedia_album' !== $entry->get_source()->get_name() ) {
		return $data;
	}

	// The $entry is the WP_Post, but we need the Gmedia term ID.
	$album_id = get_post_meta( $entry->get_id(), '_gmedia_term_ID', true );
	$images   = $gmDB->get_gmedias( [ 'album__in' => [ $album_id ], 'fields' => 'ids', ] );
	$tags     = $gmDB->get_gmedia_terms( $images, [ 'gmedia_tag' ], [ 'fields' => 'names' ] );

	if ( ! empty( $tags ) ) {
		$data['meta']['gmedia_tags'] = implode( ' ', $tags );
	}

	return $data;
}, 20, 2 );

add_filter( 'searchwp\source\attribute\options\special', function( $keys, $args ) {
	if (
		$args['source'] !== 'post' . SEARCHWP_SEPARATOR . 'gmedia_album'
		|| $args['attribute'] !== 'meta'
	) {
		return $keys;
	}

	if ( ! in_array( 'gmedia_tags',
		array_map( function( $option ) { return $option->get_value(); }, $keys )
	) ) {
		$keys[] = new \SearchWP\Option( 'gmedia_tags', 'Gmedia Tags' );
	}

	return $keys;
}, 20, 2 );