如何删除与教义2的单向多对多关联

Question

I have a unidirectional many to many association between Badges and Request like so :

Badges:

<?php

namespace Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Device
 *
 * @ORM\Table(name="badges")
 * @ORM\Entity
 */
class Badges
{
    /**
     * Unidirectional - Many users have Many favorite comments (OWNING SIDE)
     *
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="Entity\Request", cascade={"persist"})
     */
    private $invite;

}

Nothing special on the Request entity since this is a simple unidirectional association

Adding an association is fine.

But when removing the association I am doing this :

    $em = $this->CI->doctrine->em;

    //Get badges for new notifs
    $badges = $user->getBadges();

    if( $badges )
    {
        $invites = $badges->getInvite();
        if ( $invites )
        {
            foreach ( $invites as $key => $invite )
            {
                $badges->removeInvite( $invite );
            }
        }

        $em->persist( $badges );
        $em->flush();
    }
    else
    {
        return false;
    }

But it doesn't work and bring this error message for each invite I'm trying to detach from Badge:

A PHP Error was encountered

Severity: Notice

Message: Undefined index: 000000005ede1b52000000009e09e897

Filename: ORM/UnitOfWork.php

Line Number: 2739

A PHP Error was encountered

Severity: Warning

Message: array_pop() expects parameter 1 to be array, null given

Filename: Persisters/ManyToManyPersister.php

Line Number: 143

Now if I only remove one single request from Badge:

            $invites = $badges->getInvite();
            if ( $invites )
            {
                foreach ( $invites as $key => $invite )
                {
                    if( !empty( $invite ) ) {
                        $badges->removeInvite( $invite );
                        $em->persist( $invite );
                        $em->persist( $badges );
                        break;
                    }
                }
            }

I get :

<b>Fatal error</b>: Uncaught exception 'Doctrine\\ORM\\ORMInvalidArgumentException' with message 'A new entity was found through the relationship 'Entity\\Badges#invite' that was not configured to cascade persist operations for entity: Entity\\Request@000000007c08aa8800000000c42081b4. To solve this issue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cascade={&quot;persist&quot;}). If you cannot find out which entity causes the problem implement 'Entity\\Request#__toString()' to get a clue.' in /var/www/meetmyfriends-dev/application/libraries/Doctrine/ORM/ORMInvalidArgumentException.php:59

Note that I have persisted Request as specified in this error message ( Entity\\Badges#invite is a Entity\\Request )

Why is this happening ? What should I do to fix it ? I just want to detach invite from Badges to remove to association.

Thanks

EDIT: This is the implementation of Badges#removeInvite Method & Badges#addInvite Method:

    /**
     * Add invite
     *
     * @param \Entity\Request $invite
     * @return Badges
     */
    public function addInvite(\Entity\Request $invite)
    {
        $this->invite[] = $invite;

        return $this;
    }

    /**
     * Remove invite
     *
     * @param \Entity\Request $invite
     */
    public function removeInvite(\Entity\Request $invite)
    {
        $this->invite->removeElement($invite);
    }

Answer 1

Try this:

foreach ( $invites as $key => $invite )
            {
                if(!empty($invite)){
                    $badges->removeInvite( $invite );
                }
            }