Display entire title name

Hi,

i want to write a nodereference module wich uses Solr instead of MySQL. Your code was a big help and now it works with single search terms.

How can i tell Solr to return the complete title name instead of single terms? In the function below

/**
 * Helper function that suggests ways to complete partial words.
 *
 * For example, if $keys = "learn", this might return suggestions like: 
 *    learn, learning, learner, learnability.
 * The suggested terms are returned in order of frequency (most frequent first).
 *
 */
function apachesolr_autocomplete_suggest_word_completion($keys, $suggestions_to_return = 5) {
  /**
   * Split $keys into two: 
   *  $first_part will contain all complete words (delimited by spaces). Can be empty.
   *  $last_part is the (assumed incomplete) last word. If this is empty, don't suggest.
   * Example:
   *  $keys = "learning dis" : $first_part = "learning", $last_part = "dis"
   */
  preg_match('/^(:?(.* |))([^ ]+)$/', $keys, $matches);
  $first_part = $matches[2];
  $last_part = $matches[3];
  if ($last_part == '') {
    return array();
  }
  // Ask Solr to return facets that begin with $last_part; these will be the suggestions.
  $params = array(
    'facet' => 'true',
    'facet.field' => array('spell'),
    'facet.prefix' => $last_part,
    'facet.limit' => $suggestions_to_return * 5,
    'facet.mincount' => 1,
    'start' => 0,
    'rows' => 0,
  );
  // Get array of themed suggestions.
  $result = apachesolr_autocomplete_suggest($first_part, $params, 'apachesolr_autocomplete_highlight', $keys, $suggestions_to_return);
  if ($result['suggestions']) {
    return $result['suggestions'];
  } else {
    return array();
  }
}

I've tried to set 'facet.field' to 'facet.field' => array('title')
but it doesn't work. Please help me, since I am not very familiar with Solr.