Method store

/**
 * Inserts a new row if id is zero or updates an existing row in the database table
 *
 * @param   boolean  $updateNulls  If false, null object variables are not updated
 *
 * @return  boolean  True if successful, false otherwise and an internal error message is set
 *
 * @since   1.7.0
 */
public function store($updateNulls = false)
{
    if ($result = parent::store($updateNulls)) {
        // Rebuild the nested set tree.
        $this->rebuild();
    }
    return $result;
}