Drupal Search API - Simple RedHen contact autocomplete

search-api-redhen-contact-autocomplete.php

<?php

/**
 * Implements hook_menu().
 */
function MY_MODULE_menu() {
  $items['MY_MODULE/redhen/contact/autocomplete'] = array(
    'title' => 'Autocomplete for RedHen Contacts',
    'page callback' => 'MY_MODULE_contact_autocomplete',
    'access callback' => 'redhen_contact_access',
    'access arguments' => array('edit'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Contact autocomplete callback.
 *
 * @param string $search
 *   String for search.
 */
function MY_MODULE_contact_autocomplete($search) {
  $index = search_api_index_load('redhen_contacts');
  $query = new SearchApiQuery($index);
  $query->keys($search);
  $query->sort('search_api_relevance');
  $query->range(NULL, 10);
  $data = $query->execute();

  $results = array();

  if (!empty($data['results'])) {
    $contacts = redhen_contact_load_multiple(array_keys($data['results']));

    foreach ($contacts as $contact) {
      $wrapper = $contact->wrapper();
      $contact_identifier = $wrapper->full_name->value() . ' (' . $wrapper->getIdentifier() . ')';
      $contact_name = $wrapper->full_name->value() . ' <' . $wrapper->email->value() . '>';
      $results[$contact_identifier] = check_plain($contact_name);
    }
  }

  drupal_json_output($results);
}

function MY_MODULE_form_alter(&$form, &form_state) {
  $form['contact'] = array(
    '#type' => 'textfield',
    '#title' => t('Contact'),
    '#maxlength' => 60,
    '#autocomplete_path' => 'MY_MODULE/redhen/contact/autocomplete',
  );
}