doctrine 2, cant remove references from db

my blog has 3 entities as follows:

entry:

namespace Entities\Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\EntryRepository")
 * @Table(name="blog_entry")
 * @HasLifecycleCallbacks
 */
class Entry extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /** @Column(name="permalink", type="string", length=255) */
    protected $permalink;

    /** @Column(name="title", type="string", length=255) */
    protected $title;

    /** @Column(name="pub_date", type="datetime") */
    protected $pub_date;

    /** @Column(name="content", type="text") */
    protected $content;

    /** @OneToMany(targetEntity="\Entities\Blog\Comment", mappedBy="entry") */
    protected $comments;

     /**
     * @ManyToMany(targetEntity="\Entities\Blog\Category", cascade={"persist", "remove"})
     * @JoinColumn(name="id", referencedColumnName="id",onDelete="SET NULL", onUpdate="SET NULL")
     */
    protected $entrycategories;

    public function addEntry($entry) {
        $this->entrycategories->add($entry);
    }
    public function deleteDiscoverFromCategories($entry) {
        $this->entrycategories->removeElement($entry);
    }
    public function getCategories() {
        $this->entrycategories;
    }


    /** @Column(type="datetime") */
    private $created_at;

    /** @Column(type="datetime") */
    private $updated_at;

    /** @PreUpdate */
    public function updated()
    {
        $this->updated_at = new \DateTime("now");
    }

    public function __construct()
    {
      $this->entrycategories = new \Doctrine\Common\Collections\ArrayCollection();
        $this->comme开发者_运维百科nts = new \Doctrine\Common\Collections\ArrayCollection();

        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class EntryRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Entry';
}

category entitiy:

namespace Entities\Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\CategoryRepository")
 * @Table(name="blog_Ccategory")
 * @HasLifecycleCallbacks
 */
class Category extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /** @Column(name="permalink", type="string", length=255) */
    protected $permalink;

    /** @Column(name="cat_title", type="string", length=255) */
    protected $title;
     /** @ManyToMany(targetEntity="\Entities\Blog\Entry", mappedBy="entrycategories", cascade={"all"})
     */
    protected $entries;
    public function __construct()
    {
        $this->comments = new \Doctrine\Common\Collections\ArrayCollection();
        $this->entries = new \Doctrine\Common\Collections\ArrayCollection();
        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class EntryRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Entry';
}

and comments:

namespace Entities\Blog;

/**
 * @Entity(repositoryClass="\Entities\Blog\CommentRepository")
 * @Table(name="blog_comment")
 * @HasLifecycleCallbacks
 */
class Comment extends \Entities\AbstractEntity
{
    /**
     * @Id @Column(name="id", type="integer")
     * @GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ManyToOne(targetEntity="\Entities\Blog\Entry")
     * @JoinColumn(name="entry_id", referencedColumnName="id")
     */
    protected $entry;

    /** @Column(name="approved", type="string", length=255) */
    protected $approved;

    /** @Column(name="title", type="string", length=255) */
    protected $title;

    /** @Column(name="content", type="text") */
    protected $content;

    /** @Column(name="pub_date", type="datetime") */
    protected $pub_date;

    /** @Column(type="datetime") */
    private $created_at;

    /** @Column(type="datetime") */
    private $updated_at;

    /** @PreUpdate */
    public function updated()
    {
        $this->updated_at = new \DateTime("now");
    }

    public function __construct()
    {
        $this->created_at = $this->updated_at = new \DateTime("now");
    }
}

class CommentRepository extends \Entities\PaginatedRepository
{
    protected $_entityClassName = 'Entities\Blog\Comment';
}

i can add comments and entries perfectly.. so , now i have added a category entity to categorized the entries etc.. so, doctrine now created a many to many table which i can also add data in without any problems... like this:

 $getEntry = $entryRepo->find(1);     
$getCat= $this->_doctrine->getReference('\Entities\Blog\Category', cat['id']);
        $getEntry->addEntry($getCat);
        $this->em->flush();

works!..

but how do i remove this entry i made to the many to many table? i have tried everything... i looked at the dopctrine 2 documentation, and followed it and still nothing.. no errors too.

i tried:

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1);  
$getEntry->getCategories()->removeElement($getCat);
$this->em->flush();

also tried this on the category entity:

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1);  
$getCat->entries()->removeElement($getEntry);
$this->em->flush();

everytime i load the page, it doesnt show any errors neither it removes the link asscoiation front he many to many table

According to the Doctrine documentation, you need to remove the association from both entities. Have you tried a combination of both your methods? I.e.

$getCat= $cateRepo->find(1);
$getEntry = $entryRepo->find(1); 

// Remove the Category -> Entry association 
$getCat->entries()->removeElement($getEntry);

// Remove the Entry -> Category association
$getEntry->getCategories()->removeElement($getCat);

// Persist the changes
$this->em->flush();