<?php
/** index the post title of a related post field in PODS
** $related_post_id could also be used with get_post_meta or other functions to
** get info about the related post
** be sure to re-index after adding code
**/
add_filter( 'facetwp_index_row', function( $params, $class ) {
if ( 'my_facet' == $params['facet_name'] ) { // change my_facet to name of your facet
$related_post_id = $params['facet_value']['ID']; // depnding on how your relationship field saves its data this might need to be changed or looked up from a different value
$params['facet_display_value'] = get_the_title( $related_post_id ); // lookup custom field
$params['facet_value'] = $params['facet_display_value'];
}
return $params;
}, 10, 2 );