原则2.1-从集合中删除

Question

I am trying to remove comments from a parent entity, I remember doing this on my last website but now it's not working..

My entity - users

namespace Application\Entities;

use Doctrine\ORM\Mapping AS ORM,
    Doctrine\Common\Collections\ArrayCollection;

/**
 * Loan
 *
 * @ORM\Table(name="users")
 * @ORM\Entity
 */
class Users{

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


    /**
     * @var string $username
     *
     * @ORM\Column(type="string", length=45, nullable=false)
     */
    private $username;

    /**
     * @var ArrayCollection
     *
     * @ORM\OneToMany(targetEntity="Comments", mappedBy="author", cascade={"persist", "remove"})
     */
    private $comments;

    public function getComments(){

          return $this->comments;              

    }

and my comments table:

    namespace Application\Entities;

    use Doctrine\ORM\Mapping AS ORM,
        Doctrine\Common\Collections\ArrayCollection;

/**
 * Loan
 *
 * @ORM\Table(name="comments")
 * @ORM\Entity
 */
class Comments{

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


    /**
     * @var integer $user_id
     *
     * @ORM\Column(type="integer", length=15, nullable=false)
     */
    private $user_id

    /**
     * @var Loan
     *
     * @ORM\ManyToOne(targetEntity="Users", inversedBy="comments",cascade={"persist"})
     * @ORM\JoinColumns({
     *   @ORM\JoinColumn(name="user_id", referencedColumnName="id")
     * })
     */
    private $author;

This is fine, it works and I get all collections called comments in the users repository..

Now, I usually do this when I need to delete:

$commentToDelete = $this->em->getRepository('Entities\Comments')->findOneById(375);
$userResults = $this->em->getRepository('Entities\Users')->findOneById(23);
$userResults->getComments()->removeElement($commentToDelete);
$this->em->flush();

Nothing deletes, neither it throws an exception to tell me it hasn't.

I doctrine flushed it too, checked the db, and it's still there..

UPDATE:
Straight after I removeElement, I looped through the user id = 23 dataset, and the comment data for id375 is not there... so it removed it from the collection but not from the DB, and I thought $em->flush() is supposed to do this?

Please advise
Thanks

Answer 1

You need to use

$em->remove($commentToDelete);
$em->flush();

Because the mapping is held in the comment you need to remove this entity to remove the reference before you flush which will save the state to the db.