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Doctrine ManyToMany error

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Page.php
PHP
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<?php
 
namespace Rithis\PageBundle\Entity;
 
use Gedmo\Timestampable\Traits\TimestampableEntity,
Doctrine\Common\Collections\ArrayCollection,
Gedmo\Mapping\Annotation as Gedmo,
Doctrine\ORM\Mapping as ORM;
 
/**
* @ORM\Entity
* @ORM\Table
* @Gedmo\SoftDeleteable(fieldName="deletedAt")
* @Gedmo\Loggable
*/
class Page
{
use TimestampableEntity;
 
/**
* @ORM\Column(type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
* @ORM\SequenceGenerator
* @var int
*/
protected $id;
 
/**
* @ORM\Column(nullable=true)
* @Gedmo\Versioned
* @var string
*/
protected $uri;
 
/**
* @ORM\Column(length=140)
* @Gedmo\Versioned
* @var string
*/
protected $title;
 
/**
* @ORM\Column(type="text")
* @Gedmo\Versioned
* @var string
*/
protected $content;
 
/**
* @ORM\Column(type="datetime", nullable=true)
* @var \DateTime
*/
protected $deletedAt;
 
/**
* @ORM\ManyToMany(targetEntity="PageTag", inversedBy="pages", cascade={"persist"})
* @ORM\JoinTable(
* joinColumns={@ORM\JoinColumn("page_id", referencedColumnName="id")},
* inverseJoinColumns={@ORM\JoinColumn("tag_title", referencedColumnName="title")}
* )
* @var ArrayCollection
*/
protected $tags;
 
public function __construct()
{
$this->tags = new ArrayCollection();
}
 
/**
* @param int $id
*/
public function setId($id)
{
$this->id = $id;
}
 
/**
* @return int
*/
public function getId()
{
return $this->id;
}
 
/**
* @param string $uri
*/
public function setUri($uri)
{
$this->uri = $uri;
}
 
/**
* @return string
*/
public function getUri()
{
return $this->uri;
}
 
/**
* @param string $title
*/
public function setTitle($title)
{
$this->title = $title;
}
 
/**
* @return string
*/
public function getTitle()
{
return $this->title;
}
 
/**
* @param string $content
*/
public function setContent($content)
{
$this->content = $content;
}
 
/**
* @return string
*/
public function getContent()
{
return $this->content;
}
 
/**
* @param \DateTime|null $deletedAt
*/
public function setDeletedAt($deletedAt)
{
$this->deletedAt = $deletedAt;
}
 
/**
* @return \DateTime
*/
public function getDeletedAt()
{
return $this->deletedAt;
}
 
/**
* @param PageTag $tag
*/
public function addTag(PageTag $tag)
{
$this->tags[] = $tag;
}
 
/**
* @param PageTag $tag
*/
public function removeTag(PageTag $tag)
{
$this->tags->removeElement($tag);
}
 
/**
* @return PageTag
*/
public function getTags()
{
return $this->tags;
}
}
PageRepository.php
PHP
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<?php
 
namespace Rithis\PageBundle\Entity;
 
use Doctrine\ORM\EntityRepository;
 
class PageRepository extends EntityRepository
{
public function findByTags(array $tags)
{
return $this->createQueryBuilder('p')
// ->join('p.tags', 't')
// ->where('t.title in :tags')
// ->setParameter('tags', $tags)
->getQuery()
->getResult();
}
}
PageTag.php
PHP
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<?php
 
namespace Rithis\PageBundle\Entity;
 
use Doctrine\Common\Collections\ArrayCollection,
Doctrine\ORM\Mapping as ORM;
 
/**
* @ORM\Entity
* @ORM\Table
*/
class PageTag
{
/**
* @ORM\Column(length=64)
* @ORM\Id
* @var string
*/
protected $title;
 
/**
* @ORM\ManyToMany(targetEntity="Page", mappedBy="tags")
* @var ArrayCollection
*/
protected $pages;
 
public function __construct()
{
$this->pages = new ArrayCollection();
}
 
/**
* @param string $name
*/
public function setTitle($name)
{
$this->title = $name;
}
 
/**
* @return string
*/
public function getTitle()
{
return $this->title;
}
 
/**
* @param Page $page
*/
public function addPage(Page $page)
{
$this->pages[] = $page;
}
 
/**
* @param Page $page
*/
public function removePage(Page $page)
{
$this->pages->removeElement($page);
}
 
/**
* @return Page
*/
public function getPages()
{
return $this->pages;
}
}

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