Upload multiple files for each entity - symfony

Question

I am using doctrine2 with symfony2.
This is my entity to upload the file.
First, it call the setFile() and put the path to $this->temp,
then,preUpload is called ,upload called.
It is OK for uploading onefile for each entity,however, I would like to upload multiple files for each entity.
How can I handle this ?
Do you have any samples for this purpose?
/**
* #ORM\Column(type="string", length=255, nullable=true)
*/
public $path = "nophoto.jpeg";
/**
* #Assert\File(maxSize="6000000")
*/
private $file;
public function setFile(UploadedFile $file = null)
{
$this->file = $file;
// check if we have an old image path
if (is_file($this->getAbsolutePath())) {
// store the old name to delete after the update
$this->temp = $this->getAbsolutePath();
} else {
$this->path = 'initial';
}
}
/**
* #ORM\PrePersist()
* #ORM\PreUpdate()
*/
public function preUpload()
{
if (null !== $this->getFile()) {
$this->path = $this->getId().'.'.$this->getFile()->guessExtension();
}
/**
* #ORM\PostPersist()
* #ORM\PostUpdate()
*/
public function upload()
{
if (null === $this->getFile1()) {return;}
if (isset($this->temp)) {
// delete the old image
unlink($this->temp);
// clear the temp image path
$this->temp = null;
}
// you must throw an exception here if the file cannot be moved
// so that the entity is not persisted to the database
// which the UploadedFile move() method does
$this->getFile()->move(
$this->getUploadRootDir(),
$this->getId().'.'.$this->getFile()->guessExtension()
);
$this->setFile(null);
}
public function getAbsolutePath()
{
return null === $this->path
? null
: $this->getUploadRootDir().'/'.$this->getId().'.'.$this->path;
}
public function getFile1()
{
return $this->file;
}
public function getWebPath()
{
return null === $this->path
? null
: $this->getUploadDir().'/'.$this->path;
}
protected function getUploadRootDir()
{
// the absolute directory path where uploaded
// documents should be saved
return __DIR__.'/../../../../web/'.$this->getUploadDir();
}
protected function getUploadDir()
{
// get rid of the __DIR__ so it doesn't screw up
// when displaying uploaded doc/image in the view.
return 'uploads/documents';
}

Answer 1

You need new entity which will represent uploaded file with many-to-one (or many-to-many) association to your entity. This is most universal approach.
Alternatively you can store file names in array but that will complicate your validation and forms.