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Index attachment titles for parent
<?php
// Add this function to your theme functions.php and reindex.
add_filter( 'relevanssi_content_to_index', 'rlv_index_attachment_names', 10, 2 );
function rlv_index_attachment_names( $content, $post_id ) {
$attachments = get_children(
array(
'post_parent' => $post_id,
'post_type' => 'attachment',
)
);
foreach ( $attachments as $attachment ) {
$content .= ' ' . $attachment->post_title;
}
return $content;
}
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