Relevanssi user profile search with custom field weighting

relevanssi-user-search.php

<?php

// First, make sure user profiles are indexed with the meta fields.

// Here's how you run the search. Get the search terms from wherever and place them in $search_terms.

$args = array(
  's'              => $search_terms,
  'post_types'     => 'user',
  'posts_per_page' => 10, 
);

$query = new WP_Query();
$query->parse_query( $args );
relevanssi_do_query( $query );

// Now the results are in $query->posts.

// In order to do the custom field weighting, you need this function:

add_filter( 'relevanssi_match', 'rlv_user_custom_field' );
function rlv_user_custom_field( $match ) {
  if ( 'u_' === substr( $match->doc, 0, 2 ) ) {
    // This is a user profile.
    $customfield_detail = json_decode( $match->customfield_detail );
    if ( isset( $customfield_detail['color'] ) ) {
      // There's a match for color. Adjust the weight as necessary.
      $match->weight = $match->weight * 1;
    }
    if ( isset( $customfield_detail['material'] ) ) {
      // There's a match for material. Adjust the weight as necessary.
      $match->weight = $match->weight * 2;
    }
  }
  return $match;
}