I am using the search_api and the solr backend. It is possible to index first letter of content so I can use solr to create an A-Z style filter?


OK, it's a little late. But yes, you can index a glossary. I've build an A-Z-Filter in SOLR based on custom entity-fields like surname here http://www.autorenwelt.de/verzeichnis/menschen My filter based on the following description: https://drupal.org/node/2069005

I need only this functions to build a field in the SOLR index:

 * Apachesolr index name for this module.
 * Dynamically creates name as expected by Solr.
function _MODULENAME_search_index_key($key) {
  $index = array(
    'name' => $key,
    'multiple' => FALSE,
    'index_type' => 'string',
  return apachesolr_index_key($index);

 * Implementation of hook_apachesolr_index_document_build()
 * Alters what is sent to Solr in $document.
function MODULENAME_apachesolr_index_document_build($document, $entity, $entity_type, $env_id) {
    $glossary_key = _MODULENAME_search_index_key('custom_glossary');
    // We want to index the first letter of the title for use in our glossary
    $key = strtoupper($entity->title[0]);
    // Build a custom glossary of profile2 entities
    if ('profile_main' == $entity->type) {
        $key = strtoupper($entity->field_profile_surname['und'][0]['safe_value'][0]);

    $indexed = '0 - 9';
    switch ($key) {
        case 'A':
        case 'B':
        case 'C':
        case 'D':
        case 'E':
            $indexed = 'A - E';
        case 'F':
        case 'G':
        case 'H':
        case 'I':
        case 'J':
            $indexed = 'F - J';
        case 'K':
        case 'L':
        case 'M':
        case 'N':
        case 'O':
            $indexed = 'K - O';
        case 'P':
        case 'Q':
        case 'R':
        case 'S':
        case 'T':
            $indexed = 'P - T';
        case 'U':
        case 'V':
        case 'W':
        case 'X':
        case 'Y':
        case 'Z':
            $indexed = 'U - Z';
    $document->{$glossary_key} = $indexed;

And I use hook_facetapi_facet_info_alter to register this facet:

 * Implementation of hook_facetapi_facet_info_alter().
function MODULENAME_facetapi_facet_info(array $searcher_info) {
    $facets = array();
    // Facets are usually associated with the type of content stored in the index.
    if (isset($searcher_info['types']['node'])) {
        $facets['ss_custom_glossary'] = array(
            'default widget' => 'links',
            'name' => 'ss_custom_glossary',
            'label' => t('A - Z Glossar'),
            'dependency plugins' => array('role'),
            'description' => t('Glossar basierend auf dem ersten Buchstaben des Node-Titles.'),
            'field' => 'ss_custom_glossary',
            'field_alias' => 'ss_custom_glossary',
            'weight' => -50

    return $facets;

Ciao Ralf


drupal itself provide glossary module by default go to views->search with glossary->enable and you get something like this http://www.dna2life.com/a-z-index

still if you want to index manually and want to show indexing in single page http://drupal.org/node/1895352

  • Does this work with solr / search_api? I was trying to get it to work but not having much luck. Feb 18 '13 at 10:51
  • this does work, I believe it was a fault for me. Feb 19 '13 at 16:31

I used the code below with search_api/search_api_solr.

 * @file
 * Index First letter of title to make a Glossary
 * and provides new fields to index.

 * Implements hook_entity_property_info_alter().
function YOUR_MODULE_entity_property_info_alter(&$info) {

    $info['node']['properties']['lexical'] = array(
        'type' => 'string',
        'label' => t('1st Letter of the title'),
        'sanitized' => TRUE,
        'getter callback' => 'YOUR_MODULE_lexical_getter_callback',


 * Getter callback for lexical property.
function YOUR_MODULE_lexical_getter_callback($item) {
    return strtoupper($item->title[0]);

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