Doctrine2:检查Doctrine Collection中是否存在值

Question

如何检查Doctrine Collection(ManyToMany关系)字段中是否存在给定值？

例如,我尝试:

$someClass = $this->
             getDoctrine()->
             getRepository('MyBundle:MyClass')->
             find($id);

if (!$entity->getMyCollectionValues()->get($someClass->getId())) {

    $entity->addMyCollectionValue($someClass);

}

但这当然不正确.那么,如何避免重复键？

Answer 1

你可以这样做:

$object = $this->getDoctrine()->getRepository('MyBundle:MyClass')->find($id);

if ( !$entity->getMyCollectionValues()->contains($object) ) {
    $entity->addMyCollectionValue($object);
}

您可以在http://www.doctrine-project.org/api/common/2.1/class-Doctrine.Common.Collections.ArrayCollection.html中查看 Doctrine ArrayCollection的可用功能.