removeElement（）和clear（）在数组集合属性的doctrine 2中不起作用 [英] removeElement() and clear() doesn't work in doctrine 2 with array collection property

问题描述

我正在尝试用doctrine 2完成一些简单的CRUD，但是当它将时间更新一个属性集作为数组集合的记录时，我似乎没有将removeElement（）按原样工作。我甚至尝试以这种荒谬的方式做到这一点：

I'm trying to get some simple CRUD done with doctrine 2 but when it's time to update a record with one property set as an array collection I don't seem to get removeElement() to work as it's supposed to. I even tried doing it in this ridiculously ugly way:

foreach($entity->getCountries() as $c) {
        $entity->getCountries()->removeElement($c);
        $this->em->persist($entity);
        $this->em->flush();
}

它没有工作...任何人都知道如何处理这个？我已经以许多不同的形式提出了解决方案，迄今为止还没有得到很好的回应...似乎没有Doctrine 2 CRUD处理的很好的例子。我会根据要求发布更多的代码。

and it didn't work... Anyone knows how to handle this? I've asked for a solution to this in many different forms and haven't got a good response so far... seems there's lack of good examples of Doctrine 2 CRUD handling. I'll post more code at request.

修改

//in user entity
/**
 * 
 * @param \Doctring\Common\Collections\Collection $property
 * @OneToMany(targetEntity="Countries",mappedBy="user", cascade={"persist", "remove"})
 */
private $countries;

//in countries entity
/**
 *
 * @var User
 * @ManyToOne(targetEntity="User", inversedBy="id") 
 * @JoinColumns({
 *  @JoinColumn(name="user_id", referencedColumnName="id")
 * })
 */
private $user;

推荐答案

我在项目中做了类似的事情，参与者与您的用户/国家关系不同。我将只是布局这个过程，你可以看到有没有什么不同的。

I do something similar in a project with Events which have participants not unlike your User/Country relationship. I will just lay out the process and you can see if there's anything you are doing differently.

在参与者实体

/**
 * @ManyToOne(targetEntity="Event", inversedBy="participants", fetch="LAZY")
 * @JoinColumn(name="event_id", referencedColumnName="id", nullable="TRUE")
 * @var Event
 */
protected $event;

在事件实体：

/**
 * @OneToMany(targetEntity="Participant", mappedBy="event")
 * @var \Doctrine\Common\Collections\ArrayCollection
 */
protected $participants;

另外在事件#__构造函数我初始化像这个：

Also in Event#__constructor I initialize like this:

$this->participants = new \Doctrine\Common\Collections\ArrayCollection();

以下是我更新活动的方式：

Here is how I update an event:

public function update(Event $event, Event $changes)
{
    // Remove participants
    $removed = array();
    foreach($event->participants as $participant)
    {
        if(!$changes->isAttending($participant->person))
        {
            $removed[] = $participant;
        }
    }

    foreach($removed as $participant)
    {
        $event->removeParticipant($participant);
        $this->em->remove($participant);
    }

    // Add new participants
    foreach($changes->participants as $participant)
    {
        if(!$event->isAttending($participant->person))
        {
            $event->addParticipant($participant);
            $this->em->perist($participant);
        }
    }

    $event->copyFrom($changes);
    $event->setUpdated();
    $this->em->flush();
}

事件实体是：

public function removeParticipant(Participant $participant)
{
    $this->participants->removeElement($participant);
    $participant->unsetEvent();
}

public function addParticipant(Participant $participant)
{
    $participant->setEvent($this);
    $this->participants[] = $participant;
}

参与者实体是：

public function setEvent(Event $event)
{
    $this->event = $event;
}

public function unsetEvent()
{
    $this->event = null;
}

更新：isAttending方法

UPDATE: isAttending method

/**
 * Checks if the given person is a 
 * participant of the event
 * 
 * @param Person $person
 * @return boolean 
 */
public function isAttending(Person $person)
{
    foreach($this->participants as $participant)
    {
        if($participant->person->id == $person->id)
            return true;
    }

    return false;
}

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