Do not show nodes that are already included in search box

Out of the box in autocomplete field "Node title lookup" module shows all nodes that contain search string, including nodes that are already excluded from search in field "Node ids to be excluded from search result". This becomes a problem if we need to exclude lots of nodes with similar names, for example "coffee break".

we have added small helper module that fixed that problem.

/**
* Autocomplete helper, $string = string to search for.
*/
function custom_search_exclude_nid_nodes_autocomplete($string) {
$matches = array();
$query = db_select('node', 'n')
->fields('n', array('nid', 'title'));
if ( substr($string, 0,3) == "EQ ") {
$query->condition('title', substr($string, 3), '=');
}
else {
$query->condition('title', '%' . db_like($string) . '%', 'LIKE');
}
$excluded_nids = variable_get('search_exclude_nid_search_exclusion_nids', array());
if (count($excluded_nids)) {
$query->condition('n.nid', $excluded_nids, 'NOT IN');
}
$result = $query->execute();

// Save the query to matches.
foreach ($result as $row) {
$matches[$row->nid] = check_plain($row->title) . ' ( ' . $row->nid . ' )';
}

// Return the result to the form in json.
drupal_json_output($matches);
}