public function __actionEdit()
{
$synonym = $_POST['synonym'];
// remove existing instance of hash
if ($synonym['hash'] != '') {
unset($this->_synonyms[$synonym['hash']]);
}
$this->_synonyms[sha1($synonym['word'])] = array('word' => $synonym['word'], 'synonyms' => $synonym['synonyms']);
SearchIndex::saveSynonyms($this->_synonyms);
redirect("{$this->_uri}/synonyms/");
}