Apache Solr Search, add taxonomy field in search results

Question

I'm really bumping my head on this.

I simply need to add tids from a term reference field on nodes returned by a solr search result.

It's a unique term reference.

I looked for the field in solr console and it's 'im_field_arbo'.

I followed this and that and came to this :

1.

    function MYMODULE_apachesolr_index_document_build(ApacheSolrDocument $document, $entity, $entity_type, $env_id) {
      if(isset($entity->field_arbo)) {
        $document->addField('im_field_arbo', $entity->field_arbo['und'][0]['tid']);
      }
    }

This doesn't throw back any errors.

2.

Then, to retrieve it, I tried either hook_apachesolr_query_alter, hook_apachesolr_query_prepare with :

    $query->addParam('im', 'im_field_arbo');

and hook_apachesolr_modify_query with :

    $params['im'] .= ',im_field_arbo';

---

Still, no trace of my field in my search results.

Any help ? Thx very much.

---

Update

I think my field is well indexed : _apachesolr_index_document_build_node works like a charm.

Now the question is : "How do I get them back in search results ?"

Answer 1

To show the field you have added to your Solr index you first need to add it to the search result. Add this to template.php

function template_preprocess_search_result(&$variables) {
  $variables['im_field_arbo'] = $variables['result']['fields']['im_field_arbo'];
}

Then in your search-result.tpl.php you can access the field like this:

<?php if ($im_field_arbo): ?>
  <?php print $im_field_arbo; ?>
<?php endif; ?>

Answer 2

Try this,

/**
 * Implements hook_apachesolr_process_results().
 */
function mymodule_apachesolr_process_results(&$results) {
  foreach ($results as $key => &$result) {
    $result['foo'] = $result['node']->im_field_arbo;
  }
}

Call this variable in you search-result.tpl.php e.g.

<?php print $result['foo']; ?>

I think this code will work with the combination of:

function mymodule_apachesolr_query_alter(DrupalSolrQueryInterface $query) {
  $query->addParam('fl', 'im_field_arbo');
}

function mymodule_apachesolr_index_document_build(ApacheSolrDocument $document, $entity, $entity_type) {
  // I think you should do a foreach here, since you are using multi-valued field.
  foreach ($entity->field_arbo[LANGUAGE_NONE] as $key => $val) {
    $tid = $val['tid'];
    // The 1st letter indicates the data type and the last letter is
    // 'm' for multi-valued.
    $document->addField('im_field_arbo', $tid);
  }
}

I hope it helps.