public function deleteTodoItem($todo_id, $user_id)
 {
     $query = "DELETE FROM todos WHERE id=? AND user_id=?";
     $params = array($todo_id, $user_id);
     $this->db->query($query, $params);
     $result = $this->db->row() > 0;
     if (!$result) {
         return FALSE;
     }
     return true;
 }
 public function save(\Todo\Models\User $user)
 {
     $query = "INSERT INTO users (`username`,`password`)" . "VALUES (?,?)";
     $params = array($user->getUsername(), $user->getPassword());
     if ($user->getId()) {
         $query = "UPDATE users SET username=? AND password=? WHERE user_id=?";
         $params[] = $user->getId();
     }
     $this->db->query($query, $params);
     return $this->db->rows();
 }