php "usort" 一个 Doctrine\Common\Collections\ArrayCollection？
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"usort" a Doctrine\Common\Collections\ArrayCollection?
提问by luiges90
In various cases I need to sort a Doctrine\Common\Collections\ArrayCollectionaccording to a property in the object. Without finding a method doing that right away, I do this:
在各种情况下，我需要Doctrine\Common\Collections\ArrayCollection根据对象中的属性对 a 进行排序。没有找到立即执行此操作的方法，我这样做：
// $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?
当您必须将所有内容复制到本机 PHP 数组并返回时，我认为这不是最好的方法。我想知道是否有更好的方法来“调整”一个Doctrine\Common\Collections\ArrayCollection. 我想念任何医生吗？
回答by Nicolai Fr?hlich
To sort an existing Collection you are looking for the ArrayCollection::getIterator()method which returns an ArrayIterator. example:
要对现有集合进行排序，您正在寻找返回 ArrayIterator的ArrayCollection::getIterator()方法。例子：
$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 repositoryhandle your sorting.
最简单的方法是让存储库中的查询处理您的排序。
Imagine you have a SuperEntity with a ManyToMany relationship with Category entities.
想象一下，您有一个 SuperEntity 与 Category 实体之间的多对多关系。
Then for instance creating a repository method like this:
然后例如创建这样的存储库方法：
// 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.
...使排序变得非常容易。
Hope that helps.
希望有帮助。
回答by ioleo
Since Doctrine 2.3 you can use the Criteria API
从 Doctrine 2.3 开始，您可以使用Criteria API
Eg:
例如：
<?php
public function getSortedComments()
{
$criteria = Criteria::create()
->orderBy(array("created_at" => Criteria::ASC));
return $this->comments->matching($criteria);
}
Note: this solution requires public access to
$createdAtproperty or a public getter methodgetCreatedAt().
注意：此解决方案需要公共访问
$createdAt属性或公共 getter 方法getCreatedAt()。
回答by akrz
If you have an ArrayCollection field you could order with annotations. eg:
如果您有一个 ArrayCollection 字段，您可以使用注释进行排序。例如：
Say an Entity named Society has many Licenses. You could use
假设一个名为 Society 的实体拥有许多许可证。你可以用
/**
* @ORM\OneToMany(targetEntity="License", mappedBy="society")
* @ORM\OrderBy({"endDate" = "DESC"})
**/
private $licenses;
That will order the ArrayCollection by endDate (datetime field) in desc order.
这将按结束日期（日期时间字段）按降序对 ArrayCollection 进行排序。
See Doctrine documentation: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/annotations-reference.html#orderby
请参阅 Doctrine 文档：http: //docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/annotations-reference.html#orderby
回答by Fabien Salles
Doctrine criteria does not allow to order by a property on a related object.
Doctrine 标准不允许按相关对象上的属性进行排序。
If you want to do it (like me), you have to use the uasortmethod of the Iterator like a previous response and if you use PHP 7, you can use the Spaceship operator <=>like this :
如果你想这样做（像我一样），你必须uasort像之前的响应一样使用Iterator的方法，如果你使用 PHP 7，你可以<=>像这样使用 Spaceship 操作符：
/** @var \ArrayIterator $iterator */
$iterator = $this->optionValues->getIterator();
$iterator->uasort(function (ProductOptionValue $a, ProductOptionValue $b) {
return $a->getOption()->getPosition() <=> $b->getOption()->getPosition();
});
return new ArrayCollection(iterator_to_array($iterator));
