beforeValidate can't modify my data

I create form with many fields and fields for upload files (Photo.0.image, Photo.1.image).

How do I choose from my computer two files to upload and send form, then works perfectly. But sometimes I would like upload only one file (Photo.0.image) and the secend input file (Photo.1.image) leave empty. I prepare Photo::beforeValidate for this:

public function beforeValidate($options = array()) {

if(empty($this->data['Photo']['image']['tmp_name'])) {

unset($this->data['Photo']);

}

return true;

}

But my SaveAll() return false and results for pr($this->News->validationErrors) is:

Array (

[Photo] => Array (

[1] => Array ()

)

)

What going on?

Any idea?

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