Default Sort Order

The default sort option is relevancy, at the moment it is not possible to change this.

I've attached a patch creates a property for default search, and default search direction, and a setter for them both to SolrBaseQuery. This setter can be called from hook__apachesolr_query_prepare. Example usage:

function MYMODULE_apachesolr_query_prepare($query) {
  $query->setDefaultSort('ds_created', 'desc');
}

Please note there is a snippet of code which has been shared on a previous issue (https://drupal.org/node/721258) -

/**
 * Implements hook_apachesolr_prepare_query().
 */
function MYMODULE_apachesolr_query_prepare($query, $caller) {
  // If no manual sort set in querystring, set default sort to created desc
  if (!isset($_GET['solrsort'])) {
    $query->setSolrSort('ds_created', 'desc');
  }
}

This does change the default sort order, BUT it also prevents the relevancy sort order from being used. This is because the relevancy sort order link doesn't include the relevancy query parameters (?solrsort=score%20desc), and so the search order gets set to ds_created.