[英]query for not null OneToMany relationship in symfony / doctrine
I am using Symfony 3.2. 我正在使用Symfony 3.2。 I have an entity called
Site
which contains a OneToMany relationship to another entity called Indication
. 我有一个名为
Site
的实体,其中包含与另一个名为Indication
实体的OneToMany关系。
class Site
{
/**
* @ORM\OneToMany(targetEntity="IhkBundle\Entity\Indication", mappedBy="site")
*/
private $indications;
}
class Indication
{
/**
* @ORM\ManyToOne(targetEntity="IhkBundle\Entity\Site", inversedBy="indications")
* @ORM\JoinColumn(name="site_id", referencedColumnName="id")
*/
private $site;
}
I want to query for all sites
where Indications
are available. 我想查询所有可用
Indications
sites
。 I only get an ArrayCollection which I don't know what to do with. 我只得到一个不知道该怎么做的ArrayCollection。
$sites = $repository->findAll();
foreach ($sites as $site) {
$site->getIndications();
}
I also tried to use the queryBuilder like in this answer . 我也尝试在此答案中使用queryBuilder。
$query = $repository->createQueryBuilder('s');
$result = $query->where('s.indications IS NOT NULL')
->getQuery()
->getResult();
which throws the following error: 这将引发以下错误:
[Semantical Error] line 0, col 46 near 'indications IS': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected.
Seems like this can be solved by SQL by doing a simple join, something like this should work: 看起来像这样可以通过执行简单的连接来用SQL来解决,类似的事情应该可以起作用:
$query = $repository->createQueryBuilder('s');
$result = $query->select('p')
->join('p.indications', 'i')
->getQuery()
->getResult();
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