[cookbook] use __dir__ in file_upload

[ochurlaud]

in how to handle file uploads with doctrine, the doc use the _ _ dir _ _ variable.

According to SensioLabs Insight, it's not a "best practise". How can one handle this ?

Thx...

   protected function getUploadRootDir()
    {
        // the absolute directory path where uploaded
        // documents should be saved
        return __DIR__.'/../../../../web/'.$this->getUploadDir();
    }

[wouterj]

See the caution in the section: http://symfony.com/doc/current/cookbook/doctrine/file_uploads.html#using-lifecycle-callbacks

[wouterj]

see also #2346