Change dynamically validated_file_class in symfony 1.4

Question

I have this model:

Banner:
 columns:
  filename: string(255)
  url: string(255)
  position:
   type: enum
   values: [top, right]
   default: right

and this form:

class BannerForm extends BaseBannerForm
{
  public function configure()
  {
    $this->widgetSchema['filename'] = new sfWidgetFormInputFileEditable(array(
      'file_src' => $this->getObject()->getThumbURL(),
      'is_image' => true,
      'edit_mode' => $this->getObject()->exists()
    ));
    $validated_file_class = $this->getObject()->position === 'right' ? 'bannerRightValidatedFile' : 'bannerTopValidatedFile';
    $this->validatorSchema['filename'] = new sfValidatorFile(array(
      'path' => sfConfig::get('sf_upload_dir'),
      'mime_types' => 'web_images',
      'validated_file_class' => $validated_file_class',
      'required' => $this->getObject()->isNew()
    ));
  }
}

I use different validate classes because inside it i incapsulate thumbnail operations, and the sizes of banners depends on it position field. The problem is that $validated_file_class is always bannerRightValidatedFile class. How i can achieve this thing ?

Answer 1

I can suggest 4 solutions which you can choose from:

Option 1:

You should add a update$fieldNameColumn method to the form class. In your case it should look like this:

// change validated file instance before calling save
protected function updateFilenameColumn($value)
{
  if ($value instanceof sfValidatedFile)
  {
    $class = 'right' == $this->getValue('position') ? 'bannerRightValidatedFile' : 'bannerTopValidatedFile';
    // this will not work as I thought at first time
    // $this->getValidator('filename')->setOption('validated_file_class', $class);

    $this->values['filename'] = new $class(
      $value->getOriginalName(),
      $value->getType(),
      $value->getTempName(),
      $value->getSize(),
      $value->getPath()
    );

    return $this->processUploadedFile('filename');
  }

  return $value;
}

I think it's kind of hacky.

Option 2:

You should add a doctrine hook method to the model:

/**
 * @param Doctrine_Event $event
 */
public function postSave($event)
{
  $record = $event->getInvoker();

  if (array_key_exists('filename', $record->getLastModified()))
  {
    // get the full path to the file
    $file = sfConfig::get('sf_upload_dir') . '/' . $record->getFilename();

    if (file_exists($file))
    {
      // resize the file e.g. with sfImageTransformPlugin
      $img = new sfImage($file);
      $img
        ->resize(100, 100)
        ->save();
    }
  }
}

This will work when creating records whitout a form e.g. when using fixtures.

Option 3:

Use the admin.save_object event.

public static function listenToAdminSaveObject(sfEvent $event)
{
  $record = $event['object'];

  if ($event['object'] instanceof Banner)
  {
    // use the same code as in the `postSave` example
  }
}

Option 4:

Use the sfImageTransformExtraPlugin

It's kind of hard to setup and configure (and it's code is a mess :), but it makes possible to modify the size of the image whithout regenerating all the already resized ones.