php 集合更新反面形式BUG！

Posted 2021-05-05

https://github.com/symfony/symfony/issues/1540

by_reference = false, to call addElement(), removeElement()

$builder->addEventListener(FormEvents::POST_BIND, function(DataEvent $event) use ($em) {
    // Inverse relationship that we have to update
    $inverse    = $event->getData();
    // All possible owning-side Entities (very expensive this way, totally a hack)
    $owners     = $em->getRepository('MyBundle:OwnerEntity')->findAll();
    // User-selected collection of owning-side Entities
    $owned      = $inverse->getOwners();

    // Iterate through all possible owners & remove the inverse Entity in question
    foreach ($owners as $owner) {
        $owner->getInverses()->removeElement($inverse);
        $em->persist($owner);
    }

    // Re-establish the inverse Entity relationship that was just previously removed
    foreach ($owned as $owner) {
        $owner->getInverses()->add($inverse);
    }

    // Yes yes, the two previous for-each loops could be done in a single pass, but I'm just typing crap up!
});