public function update(Contribution $contribution)
 {
     if ($this->find($contribution->getId())) {
         $id = $contribution->getId();
         $status = $contribution->getStatus();
         $SQL = "UPDATE " . $this->TABLE_NAME . " SET status='{$status}' WHERE id={$id}";
         if ($result = mysql_query($SQL, $this->connection)) {
             return mysql_insert_id($this->connection);
         } else {
             echo mysql_error($this->connection);
             return false;
         }
     } else {
         echo "post not found";
         return false;
     }
 }