Klasse scheint nicht zu einem managed-Lehre Person. Hast du vergessen, eine Karte davon?

Was ich versuche zu tun ist, um eine Post - (Post-Entity) Formular wo ich auswählen kann einem vorgestellten Bild von einem anderen Objekt(Datei Entity).

Am Ende möchte ich nur die Anzeige der Dateien des Typs "featured Image" aber selbst wenn ich das entfernen meiner query_builder ich habe eine Ausnahme, der sagt:

Klasse "Site\Backend\Adminbundle\Entity\File" scheint nicht zu einem managed-Lehre Person. Hast du vergessen, eine Karte davon?

Hier ist mein PostType form

public function buildForm(FormBuilderInterface $builder, array $options) {
    $builder
           ->add('title')
           ->add('thumb', 'entity', array(
                'class' => 'Site\Backend\Adminbundle\Entity\File',
                'query_builder' => function(EntityRepository $er) {
                    return $er->createQueryBuilder('f')
                        //->where('f.state = :state')
                        //->setParameter('state', $prms['state'])
                        ->orderBy('f.dateUpdated', 'DESC');
                }
           ))
}

In der anderen hand habe ich meine beiden Entitäten:

Hier ist meine Datei entity

<?php

namespace Site\Backend\AdminBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * Site\Backend\AdminBundle\Entity\File
 *
 * @ORM\Table()
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class File {

/**
 * @var integer $id
 *
 * @ORM\Column(name="id", type="integer")
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="AUTO")
 */
private $id;

/**
 * @var \DateTime
 *
 * @ORM\Column(name="dateCreated", type="datetime")
 */
private $dateCreated;

/**
 * @var \DateTime
 *
 * @ORM\Column(name="dateUpdated", type="datetime")
 */
private $dateUpdated;

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

/**
 * @Assert\File(maxSize="6000000")
 */
private $file;

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

/**
 * @ORM\ManyToOne(targetEntity="TypeFile", inversedBy="files")
 */
private $type;


/**
 * @var string
 *
 * @ORM\OneToMany(targetEntity="Site\Backend\BlogBundle\Entity\Post", mappedBy="thumb")
 */
private $posts;

public function __construct() {
    $this->setDateCreated(new \DateTime());
    $this->setDateUpdated(new \DateTime());
    $this->type = new ArrayCollection();
}

/**
 * @ORM\PrePersist()
 * @ORM\PreUpdate()
 */
public function preUpload() {
    $this->setDateUpdated(new \DateTime());
    if (null !== $this->file) {
        //do whatever you want to generate a unique name
        $this->path = sha1(uniqid(mt_rand(), true)) . '.' . $this->file->guessExtension();
    } else {
        //throwException($e);
    }
}

/**
 * @ORM\PostPersist()
 * @ORM\PostUpdate()
 */
public function upload() {
    if (null === $this->file) {
        return;
    }

    //if there is an error when moving the file, an exception will
    //be automatically thrown by move(). This will properly prevent
    //the entity from being persisted to the database on error
    $this->file->move($this->getUploadRootDir(), $this->path);

    unset($this->file);
}

/**
 * @ORM\PostRemove()
 */
public function removeUpload() {
    if ($file = $this->getAbsolutePath()) {
        if (file_exists($file)) {
            unlink($file);
        }
    }
}

public function getAbsolutePath() {
    return null === $this->path ? null : $this->getUploadRootDir() . '/' . $this->path;
}

public function getWebPath() {
    return null === $this->path ? null : './' . $this->getUploadDir() . '/' . $this->path;
}

protected function getUploadRootDir() {
    //the absolute directory path where uploaded documents should be saved
    return __DIR__ . '/../../../../../web/' . $this->getUploadDir();
}

protected function getUploadDir() {
    //get rid of the __DIR__ so it doesn't screw when displaying uploaded doc/image in the view.
    return 'uploads/' . $this->type;
}

/**
 * Get id
 *
 * @return integer 
 */
public function getId() {
    return $this->id;
}

/**
 * Set name
 *
 * @param string $name
 * @return File
 */
public function setName($name) {
    $this->name = $name;

    return $this;
}

/**
 * Get name
 *
 * @return string 
 */
public function getName() {
    return $this->name;
}

/**
 * Set path
 *
 * @param string $path
 * @return File
 */
public function setPath($path) {
    $this->path = $path;

    return $this;
}

/**
 * Get path
 *
 * @return string 
 */
public function getPath() {
    return $this->path;
}

public function __toString() {
    return $this->name;
}

/**
 * Add type
 *
 * @param Site\Backend\AdminBundle\Entity\TypeFile $type
 * @return File
 */
public function addType(\Site\Backend\AdminBundle\Entity\TypeFile $type) {
    $this->type[] = $type;

    return $this;
}

/**
 * Remove type
 *
 * @param Site\Backend\AdminBundle\Entity\TypeFile $type
 */
public function removeType(\Site\Backend\AdminBundle\Entity\TypeFile $type) {
    $this->type->removeElement($type);
}

/**
 * Get type
 *
 * @return Doctrine\Common\Collections\Collection 
 */
public function getType() {
    return $this->type;
}

/**
 * Set type
 *
 * @param Site\Backend\AdminBundle\Entity\TypeFile $type
 * @return File
 */
public function setType(\Site\Backend\AdminBundle\Entity\TypeFile $type = null) {
    $this->type = $type;

    return $this;
}

public function getFile() {
    return $this->file;
}

public function setFile($file) {
    $this->file = $file;
}

/**
 * Set dateCreated
 *
 * @param \DateTime $dateCreated
 * @return File
 */
public function setDateCreated($dateCreated) {
    $this->dateCreated = $dateCreated;

    return $this;
}

/**
 * Get dateCreated
 *
 * @return \DateTime 
 */
public function getDateCreated() {
    return $this->dateCreated;
}

/**
 * Set dateUpdated
 *
 * @param \DateTime $dateUpdated
 * @return File
 */
public function setDateUpdated($dateUpdated) {
    $this->dateUpdated = $dateUpdated;

    return $this;
}

/**
 * Get dateUpdated
 *
 * @return \DateTime 
 */
public function getDateUpdated() {
    return $this->dateUpdated;
}


/**
 * Add posts
 *
 * @param \Site\Backend\BlogBundle\Entity\Post $posts
 * @return File
 */
public function addPost(\Site\Backend\BlogBundle\Entity\Post $posts)
{
    $this->posts[] = $posts;

    return $this;
}

/**
 * Remove posts
 *
 * @param \Site\Backend\BlogBundle\Entity\Post $posts
 */
public function removePost(\Site\Backend\BlogBundle\Entity\Post $posts)
{
    $this->posts->removeElement($posts);
}

/**
 * Get posts
 *
 * @return \Doctrine\Common\Collections\Collection 
 */
public function getPosts()
{
    return $this->posts;
}
}

Und Hier ist mein Post Entität

<?php

namespace Site\Backend\BlogBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;

/**
 * Post
 *
 * @ORM\Table()
 * @ORM\Entity
 */
class Post
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

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

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="dateCreated", type="datetime")
     */
    private $dateCreated;

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="dateUpdated", type="datetime")
     */
    private $dateUpdated;

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="datePublished", type="datetime", nullable=true)
     */
    private $datePublished;

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

    /**
     * @var string
     *
     * @ORM\Column(name="content", type="text")
     */
    private $content;

    /**
     * @var Author
     * @ORM\ManyToOne(targetEntity="Site\Backend\AdminBundle\Entity\User", inversedBy="posts")
     */
    private $author;

    /**
     * @var Thumb
     * @ORM\ManyToOne(targetEntity="Site\Backend\AdminBundle\Entity\File", inversedBy="posts")
     */
    private $thumb;

    /**
     * @var Comments
     * @ORM\OneToMany(targetEntity="Comment", mappedBy="post")
     */
    private $comments;

    /**
     * @var Categories
     * @ORM\ManyToMany(targetEntity="Category", cascade={"persist"})
     */
    private $categories;

    /**
     * @var Tags
     * @ORM\ManyToMany(targetEntity="Tag", cascade={"persist"})
     */
    private $tags;

    /**
     * Constructeur
     */
    public function __construct()
    {
        $this->setDateCreated(new \DateTime());
        $this->setDateUpdated(new \DateTime());
        $this->comments = new ArrayCollection();
        $this->Categories = new ArrayCollection();
        $this->tags = new ArrayCollection();
    }

    public function __toString(){
        return $this->title;
    }
    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set title
     *
     * @param string $title
     * @return Post
     */
    public function setTitle($title)
    {
        $this->title = $title;

        return $this;
    }

    /**
     * Get title
     *
     * @return string 
     */
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * Set dateCreated
     *
     * @param \DateTime $dateCreated
     * @return Comment
     */
    public function setDateCreated($dateCreated)
    {
        $this->dateCreated = $dateCreated;

        return $this;
    }

    /**
     * Get dateCreated
     *
     * @return \DateTime 
     */
    public function getDateCreated()
    {
        return $this->dateCreated;
    }

    /**
     * Set dateUpdated
     *
     * @param \DateTime $dateUpdated
     * @return Comment
     */
    public function setDateUpdated($dateUpdated)
    {
        $this->dateUpdated = $dateUpdated;

        return $this;
    }

    /**
     * Get dateUpdated
     *
     * @return \DateTime 
     */
    public function getDateUpdated()
    {
        return $this->dateUpdated;
    }

    /**
     * Get datePublished
     *
     * @return \DateTime 
     */
    public function getDatePublished()
    {
        return $this->datePublished;
    }

    /**
     * Set datePublished
     *
     * @param \DateTime $datePublished
     * @return Comment
     */
    public function setDatePublished($datePublished)
    {
        $this->datePublished = $datePublished;

        return $this;
    }

    /**
     * Set state
     *
     * @param string $state
     * @return Post
     */
    public function setState($state)
    {
        $this->state = $state;

        return $this;
    }

    /**
     * Get state
     *
     * @return string 
     */
    public function getState()
    {
        return $this->state;
    }

    /**
     * Set content
     *
     * @param string $content
     * @return Post
     */
    public function setContent($content)
    {
        $this->content = $content;

        return $this;
    }

    /**
     * Get content
     *
     * @return string 
     */
    public function getContent()
    {
        return $this->content;
    }

    /**
     * Set author
     *
     * @param \Site\Backend\AdminBundle\Entity\User $author
     * @return Post
     */
    public function setAuthor(\Site\Backend\AdminBundle\Entity\User $author = null)
    {
        $this->author = $author;

        return $this;
    }

    /**
     * Get author
     *
     * @return \Site\Backend\AdminBundle\Entity\User 
     */
    public function getAuthor()
    {
        return $this->author;
    }

    /**
     * Add comments
     *
     * @param \Site\Backend\BlogBundle\Entity\Comment $comments
     * @return Post
     */
    public function addComment(\Site\Backend\BlogBundle\Entity\Comment $comments)
    {
        $this->comments[] = $comments;

        return $this;
    }

    /**
     * Remove comments
     *
     * @param \Site\Backend\BlogBundle\Entity\Comment $comments
     */
    public function removeComment(\Site\Backend\BlogBundle\Entity\Comment $comments)
    {
        $this->comments->removeElement($comments);
    }

    /**
     * Get comments
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getComments()
    {
        return $this->comments;
    }

    /**
     * Add Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     * @return Post
     */
    public function addCategory(\Site\Backend\BlogBundle\Entity\Category $category)
    {
        $this->categories[] = $category;

        return $this;
    }

    /**
     * Add Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     * @return Post
     */
    public function addCategoriesNew(\Site\Backend\BlogBundle\Entity\Category $category)
    {
        $this->categories[] = $category;

        return $this;
    }

    /**
     * Remove Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     */
    public function removeCategory(\Site\Backend\BlogBundle\Entity\Category $category)
    {
        $this->categories->removeElement($category);
    }

    /**
     * Remove Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     */
    public function removeCategoriesNew(\Site\Backend\BlogBundle\Entity\Category $category)
    {

    }

    /**
     * Get Categories
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getCategories()
    {
        return $this->categories;
    }

    /**
     * Get Categories
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getCategoriesNew()
    {
        //return $this->categories;
    }

    /**
     * Add tags
     *
     * @param \Site\Backend\BlogBundle\Entity\tag $tags
     * @return Post
     */
    public function addTag(\Site\Backend\BlogBundle\Entity\Tag $tags)
    {
        $this->tags[] = $tags;

        return $this;
    }

    /**
     * Add tags
     *
     * @param \Site\Backend\BlogBundle\Entity\tag $tags
     * @return Post
     */
    public function addTagsNew(\Site\Backend\BlogBundle\Entity\Tag $tags)
    {
        $this->tags[] = $tags;

        return $this;
    }

    /**
     * Remove tags
     *
     * @param \Site\Backend\BlogBundle\Entity\Tag $tags
     */
    public function removeTag(\Site\Backend\BlogBundle\Entity\Tag $tags)
    {
        $this->tags->removeElement($tags);
    }

    /**
     * Remove Tags
     *
     * @param \Site\Backend\BlogBundle\Entity\tag $tags
     */
    public function removeTagsNew(\Site\Backend\BlogBundle\Entity\Tag $tags)
    {
        //$this->tags->removeElement($tags);
    }

    /**
     * Get Tags
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getTags()
    {
        return $this->tags;
    }

    /**
     * Get Tags
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getTagsNew()
    {
        //return $this->Tags;
    }

    /**
     * Add Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     * @return Post
     */
    public function addCategorie(\Site\Backend\BlogBundle\Entity\Category $categories)
    {
        $this->categories[] = $categories;

        return $this;
    }

    /**
     * Remove Categories
     *
     * @param \Site\Backend\BlogBundle\Entity\Category $categories
     */
    public function removeCategorie(\Site\Backend\BlogBundle\Entity\Category $categories)
    {
        $this->categories->removeElement($categories);
    }

    /**
     * @ORM\preUpdate
     */
    public function setUpdateValue(){
        $this->setDateUpdated(new \DateTime());
    }

    /**
     * Set thumb
     *
     * @param \Site\Backend\AdminBundle\Entity\File $thumb
     * @return Post
     */
    public function setThumb(\Site\Backend\AdminBundle\Entity\File $thumb = null)
    {
        $this->thumb = $thumb;

        return $this;
    }

    /**
     * Get thumb
     *
     * @return \Site\Backend\AdminBundle\Entity\File 
     */
    public function getThumb()
    {
        return $this->thumb;
    }
    }

Vielen Dank im Voraus
Ich hoffe, ich war klar, wenn Es nicht der Fall ist bitte Sag es mir.