1
我有一個名爲「InterestGroup」的實體，它具有屬性「children」形式的自引用關聯（鄰接列表）（一對多）和「父母」（多對一）。Symfony實體字段類型查詢生成器中的where子句不工作一對多自引用關聯
在爲InterestGroup設置表單類型時，我試圖爲屬性父級提供一個選擇列表，該列表擁有所有「頂級」興趣組（其'父'屬性爲null'）的選擇。當我將EntityType字段的where子句和null參數添加到query_builder時，即使我有幾個頂級（父爲空）興趣組持續存在，它也不會返回任何內容。如果我刪除where子句，它將返回表中的所有InterestGroups。我很難理解爲什麼where子句不起作用。
這是有問題的領域：
->add('parent',EntityType::class,
array(
'placeholder' => 'Top Level (No Parent)',
'required' => false,
'class' => 'Common\ContentBundle\Entity\InterestGroup',
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('ig')
->where('ig.parent = :n')
->setParameter('n',null)
->orderBy('ig.title', 'ASC');
},
'choice_label' => 'title'
)
)
以上會返回一個空的選擇菜單。通過刪除where子句和setparameter，我得到所有InterestGroup實體，包括所有那些具有空父母的實體。
以下是實體類的InterestGroup
<?php
namespace Common\ContentBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
use Symfony\Component\Validator\Constraints as Assert;
use Gedmo\Mapping\Annotation as Gedmo;
/**
* InterestGroup
*
* @ORM\Table(name="interest_group")
* @ORM\Entity(repositoryClass="Common\ContentBundle\Repository\InterestGroupRepository")
*/
class InterestGroup
{
/**
* @var int
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
*
* @ORM\Column(name="title", type="string", length=255, unique=true)
* @Assert\NotBlank(message="This is a required field.")
*/
private $title;
/**
* @ORM\OneToMany(targetEntity="InterestGroup", mappedBy="parent")
*/
private $children;
/**
* @ORM\ManyToOne(targetEntity="InterestGroup", inversedBy="children")
* @ORM\JoinColumn(name="parent_id", referencedColumnName="id")
*/
private $parent;
/**
* @Gedmo\Slug(fields={"title"})
* @ORM\Column(length=128, unique=true)
*/
private $slug;
// ...
/**
* @ORM\ManyToMany(targetEntity="Product", mappedBy="interestGroups")
*/
private $products;
/**
* InterestGroup constructor.
*/
public function __construct()
{
$this->children = new ArrayCollection();
$this->products = new ArrayCollection();
}
/**
* Get id
*
* @return int
*/
public function getId()
{
return $this->id;
}
/**
* @return string
*/
public function getTitle()
{
return $this->title;
}
/**
* @param string $title
*/
public function setTitle($title)
{
$this->title = $title;
}
/**
* @return mixed
*/
public function getSlug()
{
return $this->slug;
}
/**
* @return mixed
*/
public function getChildren()
{
return $this->children;
}
/**
* @param mixed $children
*/
public function setChildren($children)
{
$this->children = $children;
}
/**
* @return mixed
*/
public function getParent()
{
return $this->parent;
}
/**
* @param mixed $parent
*/
public function setParent($parent)
{
$this->parent = $parent;
}
/**
* @return mixed
*/
public function getProducts()
{
return $this->products;
}
}
和表單類型類：提前
<?php
namespace Common\ContentBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Doctrine\ORM\EntityRepository;
class InterestGroupType extends AbstractType
{
/**
* @param FormBuilderInterface $builder
* @param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title',TextType::class)
->add('parent',EntityType::class,
array(
'placeholder' => 'Top Level (No Parent)',
'required' => false,
'class' => 'Common\ContentBundle\Entity\InterestGroup',
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('ig')
->where('ig.parent = :n')
->setParameter('n',null)
->orderBy('ig.title', 'ASC');
},
'choice_label' => 'title'
)
)
;
}
/**
* @param OptionsResolver $resolver
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Common\ContentBundle\Entity\InterestGroup'
));
}
}
謝謝！