Symfony 3 : how to reordering an array collection with route action? - symfony

Question

I have a Product Entity. Each product can have 0 or N pictures.
I have a ProductPhoto Entity which has a order property (0 = first).
On a page, I list all the pictures of my current product. I would like to manage pictures order with 2 up/down arrows.
When the user clicks on an arrow, it moves up/down the picture compared to the others.
So, on each arrow, there is a link that corresponds to a route action in my ProductController.
It's not very complicated to update only the order of the picture that moved, but I don't know how to update the order of other pictures in the ArrayCollection...
/**
* Manage picture order
*
* #Route("/products/{id}/photos/{idphoto}/move-{direction}", name="prod_move_photo")
*/
public function movePhotoAction($id, $idphoto, $direction, Request $request) {
$em = $this->getDoctrine()->getManager();
$photo = $em->getRepository('AppBundle:ProductPhoto')->find($idphoto);
if ($direction == 'up') {
$order = $photo->getOrder() - 1;
if ($order >= 0)
$photo->setOrder($order);
else
$photo->setOrder(0);
} elseif ($direction == 'down') {
$order = $photo->getOrder() + 1;
$photo->setOrder($order);
} else {
throw $this->createNotFoundException("The type of ordering '" . $direction . "' doesn't exist.");
}
$em->flush();
// redirection
return $this->redirectToRoute('prod_photos', array('id' => $id));
}
Maybe using PHP uksort() ?

Answer 1

It looks like you want to update order fields in two ProductPhotos moved by each other, right? So please try this:
/**
* Manage picture order
*
* #Route("/products/{id}/photos/{idphoto}/move-{direction}", name="prod_move_photo")
*/
public function movePhotoAction($id, $idphoto, $direction, Request $request) {
$em = $this->getDoctrine()->getManager();
$photo = $em->getRepository('AppBundle:ProductPhoto')->find($idphoto);
$order = $photo->getOrder();
switch($direction) {
case 'up':
$newOrder = ($order >= 1) ? ($order - 1) : (int) 0;
break;
case 'down':
$newOrder = $order + 1;
break;
default:
throw $this->createNotFoundException("The type of ordering '" . $direction . "' doesn't exist.");
}
$anotherPhoto = $em->getRepository('AppBundle:ProductPhoto')->findOneByOrder($newOrder);
$photo->setOrder($newOrder);
$anotherPhoto->setOrder($order);
$em->flush();
// redirection
return $this->redirectToRoute('prod_photos', array('id' => $id));
}

Answer 2

The solution of #Snegirekk works very well (and I use it), but here is the solution I found, if it can help...
/**
* Manage picture order
*
* #Route("/products/{id}/photos/{idphoto}/move-{direction}", name="prod_move_photo")
*/
public function movePhotoAction($id, $idphoto, $direction, Request $request) {
$em = $this->getDoctrine()->getManager();
$photo = $em->getRepository('AppBundle:ProductPhoto')->find($idphoto);
// Current order of the photo
$currentPos = $photo->getOrder();
// Determine new order
if ($direction == 'up') {
$newPos = ($currentPos > 0) ? $currentPos - 1 : 0;
} elseif ($direction == 'down') {
$newPos = $currentPos + 1;
} else {
throw $this->createNotFoundException("The type of ordering '" . $direction . "' doesn't exist.");
}
$product = $em->getRepository('AppBundle:Product')->find($id);
// Get product photos with actual order (moveElement() needs an array)
$photos = $product->getPhotos()->toArray();
// Reorder photos in ArrayCollection
$this->moveElement($photos, $currentPos, $newPos);
// Reorder photos in database (with keys of formatted ArrayCollection)
foreach ($photos as $order => $p) {
$p->setOrder($order);
}
$em->flush();
// redirection
return $this->redirectToRoute('prod_photos', array('id' => $id));
}
/**
* Move an array element to a new index
*
* #param array $array Array of elements to sort
* #param integer $currentPos Current position of the element to move
* #param integer $newPos New position of the element to move
* #return void
*/
public function moveElement(&$array, $currentPos, $newPos) {
$out = array_splice($array, $currentPos, 1);
array_splice($array, $newPos, 0, $out);
}