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Update file_uploads.rst

Code examples do not apply to Doctrine EventSubscribers scenario, on preUpdate.Cheers.

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Original file line number	Diff line number	Diff line change
@@ -371,6 +371,12 @@ Next, refactor the ``Document`` class to take advantage of these callbacks::
`371`	`371`	`// do whatever you want to generate a unique name`
`372`	`372`	`$filename = sha1(uniqid(mt_rand(), true));`
`373`	`373`	`$this->path = $filename.'.'.$this->getFile()->guessExtension();`
	`374`	`+ // Note: is you choose to use EvensubScribers, this change has no effect un database Update`
	`375`	`+ // the 'initial' value set in {@link self::setFile()} is used instead. As this occurs`
	`376`	`+ // inside EntityManager#flush() and changeSets are not tracked.`
	`377`	`+ // use \Doctrine\Common\Persistence\Event\PreUpdateEventArgs $args as the handler fn param and`
	`378`	`+ // $args->setNewValue('path', $filename);`
	`379`	`+ // source: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/events.html#preupdate`
`374`	`380`	`}`
`375`	`381`	`}`
`376`	`382`

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