Spellcheck index not built, no spellcheck suggestions available.

Ok I think, the problem is, that the spellchecker index is never build.
I see, that the spellchecker files in the data folder are empty.

I added the following parameter to the search query:
function mymodule_apachesolr_query_alter(&$query) {

$query->addParam('spellcheck.build', true);

}

With the next query, the spellchecker index was build.

Of cource, the build parameter should only be added once.
I checked the code of the apache solr module and I think, the spellchecker.build parameter is only added if the index is deleted.

But there must be a somewhere a switch that builds the spellchecker index after indexing some documents.

Hi Nick_vh

All my analysis is based on a new solr installation without a data directory. People who have a spellchecker, should delete the whole data directory and then have a look, if it is rebuild. With the latest version, the spellchecker is never built.

I also found the function "apachesolr_search_build_spellcheck" but I think, this function does not work. Because there is a try / catch or because it never gets executed. If you use the "Delete index" function in the UI, the spellchecker never gets deleted.

I made a small module, to manually rebuild the spellchecker index. I wanted to use the code from the function "apachesolr_search_build_spellcheck", but the code throws an error.

The Api has changed:

Code from apachesolr module:
$response = $solr->search('solr', 0, 0, $params);

Working code:
$response = $solr->search('solr', $params);

I made a custom module, that adds a button to the backend, to rebuild the spellchecker index:

function mymodule_form_alter(&$form, $form_state, $form_id) {
    case 'apachesolr_index_action_form':
      $form['action']['spellcheck'] = array(
        '#prefix' => '<div>',
        '#type' => 'submit',
        '#value' => t('Rebuild spellchecker'),
        '#submit' => array('mymodule_rebuild_spellchecker'),
      );
      break;
   }
}

function mymodule_rebuild_spellchecker(array $form, array &$form_state) {
   try {
    $solr = apachesolr_get_solr();

    kpr($solr);
    $params['spellcheck'] = 'true';
    $params['spellcheck.build'] = 'true';
    $response = $solr->search('solr', $params);

    $destination = array();
    if (isset($_GET['destination'])) {
      $destination = drupal_get_destination();
      unset($_GET['destination']);
    }
    $form_state['redirect'] = array('admin/config/search/apachesolr');

    drupal_set_message(t('Spellchecker rebuild'), 'warning');

   }
   catch (Exception $e) {
     watchdog('Apache Solr', nl2br(check_plain($e->getMessage())), NULL, WATCHDOG_ERROR);
   }
}

But this is not a real solution. If you add new documents to the index, the spellchecker index will not be updated. I searched for a hook in apache solr but there is only an hook_index_document that is not suitable for rebuilding the spellchecker index.

I searched for a possibility to rebuild the spellcheck index from the solr side but I did not found a solution.

The is a possibility to rebuild the spellchecker index on commit:
http://wiki.apache.org/solr/SpellCheckComponent#Building_on_Commits

But I don't see a way how to add this line to the config file:
<str name="buildOnCommit">true</str>

There is no configuration available for this.

Ok I got it. It's not in solrconfig.xml, it's in solrconfig_extra.xml...

<str name="buildOnCommit">true</str>

You have to add this line to the file, the it works as expected. The index is built on commit. I think this is a severe bug.

<lst name="spellchecker">
  <str name="name">default</str>
  <str name="field">content</str>
  <str name="spellcheckIndexDir">spellchecker</str>
  <str name="buildOnCommit">true</str>
  <!-- uncomment this to require terms to occur in 1% of the documents in order to be included in the dictionary
    <float name="thresholdTokenFrequency">.01</float>
  -->
</lst>

Hi Peter

If you take the current 7-x1.2 version:

Could you show me, how the spellchecker index is rebuilt once per day? Building on commit might be costly. But I don't see any code, that rebuilds the spellchecker index even once a day. I also noticed this on Acquia search. I have a customer where the spellchecker index is not built.