Ожидаемый аргумент типа ..., дано "Doctrine \ Common \ Collections \ ArrayCollection"

Question

Итак, я делаю форму для сохранения атрибута, и этот атрибут должен быть ссылкой на веб-сайт. Когда я пытаюсь сохранить атрибут, я получаю эту ошибку: указан ожидаемый аргумент типа «App \ Entity \ Website», «Doctrine \ Common \ Collections \ ArrayCollection».

Вот код для 2 объекта и контроллера.

Website.php

<?php

namespace App\Entity;

use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\WebsiteRepository")
 */
class Website
{
/**
 * @ORM\Id()
 * @ORM\GeneratedValue()
 * @ORM\Column(type="integer")
 */
private $id;

/**
 * @ORM\Column(type="string", length=255)
 */
private $slug;

/**
 * @ORM\Column(type="string", length=255)
 */
private $name;

/**
 * @var \DateTime $created_at
 * @Gedmo\Timestampable(on="create")
 * @ORM\Column(type="datetime")
 */
private $created_at;

/**
 * @var \DateTime $updated_at
 * @Gedmo\Timestampable(on="update")
 * @ORM\Column(type="datetime")
 */
private $updated_at;

/**
 * @var \DateTime $contentChanged
 *
 * @ORM\Column(name="content_changed", type="datetime", nullable=true)
 * @Gedmo\Timestampable(on="change", field={"slug", "name"})
 */
private $contentChanged;

public function __construct() {
    $this->attribute = new \Doctrine\Common\Collections\ArrayCollection();
}

public function getId(): ?int
{
    return $this->id;
}

public function getSlug(): ?string
{
    return $this->slug;
}

public function setSlug(string $slug): self
{
    $this->slug = $slug;

    return $this;
}

public function getName(): ?string
{
    return $this->name;
}

public function setName(string $name): self
{
    $this->name = $name;

    return $this;
}

public function getCreatedAt(): ?\DateTimeInterface
{
    return $this->created_at;
}

public function setCreatedAt(?\DateTimeInterface $created_at): self
{
    $this->created_at = $created_at;

    return $this;
}

public function getUpdatedAt(): ?\DateTimeInterface
{
    return $this->updated_at;
}

public function setUpdatedAt(?\DateTimeInterface $updated_at): self
{
    $this->updated_at = $updated_at;

    return $this;
}

public function getContentChanged()
{
    return $this->contentChanged;
}

public function __toString()
{
    return ($this->getName()) ? $this->getName() : '';
}
}

Attribute.php

namespace App\Entity;

use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\AttributeRepository")
 */
class Attribute
{
/**
 * @ORM\Id()
 * @ORM\GeneratedValue()
 * @ORM\Column(type="integer")
 */
private $id;

/**
 * Many Attibute have Many Website.
 * @ORM\ManyToMany(targetEntity="Attribute")
 * @ORM\JoinTable(name="attribute_website",
 *      joinColumns={@ORM\JoinColumn(name="attribute_id", referencedColumnName="id")},
 *      inverseJoinColumns={@ORM\JoinColumn(name="website_id", referencedColumnName="id")}
 *      )
 */
private $website;

/**
 * @ORM\Column(type="string", length=255)
 */
private $slug;

/**
 * @ORM\Column(type="string", length=255)
 */
private $name;

/**
 * @ORM\Column(type="string", length=255)
 */
private $type;

/**
 * @ORM\Column(type="integer", nullable=true)
 */
private $is_master_attribute;

/**
 * @ORM\Column(type="text", nullable=true)
 */
private $options;

/**
 * @ORM\Column(type="string", length=255, nullable=true)
 */
private $prefix;

/**
 * @var \DateTime $created_at
 * @Gedmo\Timestampable(on="create")
 * @ORM\Column(type="datetime")
 */
private $created_at;

/**
 * @var \DateTime $updated_at
 * @Gedmo\Timestampable(on="update")
 * @ORM\Column(type="datetime")
 */
private $updated_at;

/**
 * @var \DateTime $contentChanged
 *
 * @ORM\Column(name="content_changed", type="datetime", nullable=true)
 * @Gedmo\Timestampable(on="change", field={"slug", "name", "type", "is_master_attribute", "options", "prefix"})
 */
private $contentChanged;

public function getId(): ?int
{
    return $this->id;
}

public function getWebsite(): ?Website
{
    return $this->website;
}

public function setWebsite(Website $website): self
{
    $this->website = $website;

    return $this;
}

public function getSlug(): ?string
{
    return $this->slug;
}

public function setSlug(string $slug): self
{
    $this->slug = $slug;

    return $this;
}

public function getName(): ?string
{
    return $this->name;
}

public function setName(string $name): self
{
    $this->name = $name;

    return $this;
}

public function getType(): ?string
{
    return $this->type;
}

public function setType(string $type): self
{
    $this->type = $type;

    return $this;
}

public function getIsMasterAttribute(): ?int
{
    return $this->is_master_attribute;
}

public function setIsMasterAttribute(?int $is_master_attribute): self
{
    $this->is_master_attribute = $is_master_attribute;

    return $this;
}

public function getOptions(): ?string
{
    return $this->options;
}

public function setOptions(?string $options): self
{
    $this->options = $options;

    return $this;
}

public function getPrefix(): ?string
{
    return $this->prefix;
}

public function setPrefix(?string $prefix): self
{
    $this->prefix = $prefix;

    return $this;
}

public function getCreatedAt(): ?\DateTimeInterface
{
    return $this->created_at;
}

public function setCreatedAt(?\DateTimeInterface $created_at): self
{
    $this->created_at = $created_at;

    return $this;
}

public function getUpdatedAt(): ?\DateTimeInterface
{
    return $this->updated_at;
}

public function setUpdatedAt(?\DateTimeInterface $updated_at): self
{
    $this->updated_at = $updated_at;

    return $this;
}

public function getContentChanged()
{
    return $this->contentChanged;
}

public function __toString()
{
    return ($this->getName()) ? $this->getName() : '';
}
}

AttributeAdmin.php

namespace App\Admin;

use Sonata\AdminBundle\Admin\AbstractAdmin;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Datagrid\DatagridMapper;
use Sonata\AdminBundle\Form\FormMapper;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use App\Entity\Website;

class AttributeAdmin extends AbstractAdmin
{
private $attribute;

//public function __construct(Attribute $attribute){
    //parent::__construct();
    //$this->attribute = $attribute;
//}

protected function configureFormFields(FormMapper $formMapper)
{
    $formMapper->add('slug', TextType::class);
    $formMapper->add('name', TextType::class);
    $formMapper->add('website', EntityType::class, array(
'class'    => 'App\Entity\Website',
'multiple' => true)
);
}

protected function configureDatagridFilters(DatagridMapper $datagridMapper)
{
    $datagridMapper->add('slug');
    $datagridMapper->add('name');
}

protected function configureListFields(ListMapper $listMapper)
{
    $listMapper->addIdentifier('slug');
    $listMapper->addIdentifier('name');
    $listMapper->add('created_at', 'datetime', array('format' => 'Y-m-d H:m:s'));
    $listMapper->add('updated_at','datetime', array('format' => 'Y-m-d H:m:s'));
}
}

Что я должен сделать, чтобы сохранить атрибут с веб-сайтами, которые были выбраны?

Спасибо