luiges90 luiges90 - 3 months ago 26
PHP Question

"usort" a Doctrine\Common\Collections\ArrayCollection?

In various cases I need to sort a

Doctrine\Common\Collections\ArrayCollection
according to a property in the object. Without finding a method doing that right away, I do this:

// $collection instanceof Doctrine\Common\Collections\ArrayCollection
$array = $collection->getValues();
usort($array, function($a, $b){
return ($a->getProperty() < $b->getProperty()) ? -1 : 1 ;
});

$collection->clear();
foreach ($array as $item) {
$collection->add($item);
}


I presume this is not the best way when you have to copy everything to native PHP array and back. I wonder if there is a better way to "usort" a
Doctrine\Common\Collections\ArrayCollection
. Do I miss any doc?

Answer

To sort an existing Collection you are looking for the ArrayCollection::getIterator() method which returns an ArrayIterator. example:

$iterator = $collection->getIterator();
$iterator->uasort(function ($a, $b) {
    return ($a->getPropery() < $b->getProperty()) ? -1 : 1;
});
$collection = new ArrayCollection(iterator_to_array($iterator));

The easiest way would be letting the query in the repository handle your sorting.

Imagine you have a SuperEntity with a ManyToMany relationship with Category entities.

Then for instance creating a repository method like this:

// Vendor/YourBundle/Entity/SuperEntityRepository.php

public function findByCategoryAndOrderByName($category)
{
    return $this->createQueryBuilder('e')
        ->where('e.category = :category')
        ->setParameter('category', $category)
        ->orderBy('e.name', 'ASC')
        ->getQuery()
        ->getResult()
    ;
}

... makes sorting pretty easy.

Hope that helps.

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