class Poll
{
  public function save()
  {
    if( id !== null )
       $this->update();
    else
       $this->insert();

    // save options
    for( $i=0; $i<$this->options->count(); $i++ )
       $this->getOptionAt($i)->save();
  }
}

class PollOption
{
  public function save()
  {
      if( id !== null )
          $this->update();
      else
          $this->insert();
  }
}