我按照 Cerad 和 tomazahlin 的建议提出了解决方案。
我确信全世界每年至少有 2 人遇到我同样的问题，所以我会花一些时间来发布我的结果。
欢迎指正、批评或加我，最后我是 Symfony 的新手！
首先，我最后是如何定义我的两个类的。
class User
{
//...
/**
* @ORM\ManyToMany(targetEntity="UserGoods", inversedBy="users", cascade={"persist", "remove"})
* @ORM\JoinColumn(name="goods", referencedColumnName="id")
*/
// Should have been a OneToMany relationship, but Doctrine requires the
// owner side to be on the Many side, and I need it on the One side.
// A ManyToMany relationship compensate this.
private $goods;
public function __construct()
{
$this->goods = new ArrayCollection();
}
//...
}
还有连接类
/**
* @ORM\HasLifecycleCallbacks()
**/
class UserGoods
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var \DateTime
*
* @ORM\Column(name="inserted_at", type="datetime")
*/
private $insertedAt;
/**
* @var float
*
* @ORM\Column(name="value", type="float", nullable=true)
*/
// I do not want this field to be null, but in this way when
// persisting I can look for null elements and remove them
private $value;
/**
* @ORM\ManyToMany(targetEntity="User", inversedBy="goods")
*/
protected $users;
/**
* @ORM\PrePersist()
* @ORM\PreUpdate()
*/
// This automatically sets InsertedAt value when inserting or
// updating an element.
public function setInsertedAtValue()
{
$date = new \DateTime();
$this->setInsertedAt( $date );
}
}
正如我所说，我想要一个 FormBuilder 来处理我的数组集合。用于此目的的最佳表单类型是...集合类型。
这需要将子表单定义为其类型。
<?php
namespace MyBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use MyBundle\Entity\UserGoods;
class UserType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('goods', 'collection', array(
'type' => new GoodsdataWithDateType(),
'required' => false,
)
);
\\ ...
还有子表单。
由于我只需要显示今天的值，而不是全部，因此我还需要添加一个 FormEvent 子句来检查要插入的项目。
namespace MyBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Doctrine\ORM\EntityManager;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
class GoodsdataWithDateType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
// Here I add the event listener:
// Since I want only today's value to be displayed, I implement
// a check on this field of each element
$builder->addEventListener(
FormEvents::PRE_SET_DATA, function (FormEvent $event) {
$goods = $event->getData();
$form = $event->getForm();
$datetime1 = $goods->getInsertedAt();
$datetime2 = new \DateTime();
$datetime2->setTime(0, 0, 0);
if ($datetime1 > $datetime2)
{
$form->add('value', 'number', array(
'required' => false,
));
// I am setting this value with LifecycleCallbacks, and I do not
// want the user to change it, I am adding it commented just for
// completeness
// $form->add('insertedAt', 'date', array(
// 'widget' => 'single_text',
// 'format' => 'yyyy,MM,dd',
// ));
}
});
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'MyBundle\Entity\UserGoods',
));
}
public function getName()
{
return 'goodsdatawithdate';
}
}
这可以正常工作，但在树枝文件中使用 {{ form(form) }} 之类的内容呈现时显示非常糟糕。
为了使其更加用户友好，我自定义了表单的呈现方式，以删除一些垃圾并仅包含必要的标签。
所以在我的树枝上：
{{ form_start(form) }}
{{ form_errors(form) }}
<div>
{{ form_label(form.goods) }}
{{ form_errors(form.goods) }}
<br>
{% for field in form.goods %}
{{ form_widget(field) }}
{% endfor %}
</div>
{{ form_end(form) }}
到目前为止这很好，但我也想在我的收藏中加入新元素，特别是如果今天的商品还没有插入的话。
我可以在我的 FormBuilder 中执行此操作，方法是在调用 $builder 之前在数组中手动添加一个新项目。
class UserType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$thisuser = $builder->getData();
// I added the following function inside the User class.
// I use a for loop to scroll all the associated Goods to get the
// latest one.
$mygoods = $thisuser->getLatestGoods();
if ( $mygoods && null !== $mygoods->getId() ) {
// The Array contains already some elements
$datetime1 = $mygoods->getInsertedAt();
$datetime2 = new \DateTime();
$datetime2->setTime(0, 0, 0);
// Check when was the last one inserted
if ($datetime1 < $datetime2) // Nice way to compare dates
{
// If it is older than today, add a new element to the array
$newgoods = new UserGoods();
$thisuser->addGoods($newgoods);
}
} else {
// The array is empty and I need to create the firs element
$newgoods = new UserGoods();
$thisuser->addGoods($newgoods);
}
$builder->add('goods', 'collection', array(
'type' => new GoodsdataWithDateType(),
'required' => false,
'allow_add' => true, // this enables the array to be
// populated with new elements
)
);
但我还希望，如果用户删除了插入的值（即，在表单中不插入任何内容），则应删除关联的数组元素。
允许用户删除元素有点棘手。我不能依赖“allow_delete”属性，因为只使用集合中的最后一个项目，提交表单时所有以前的项目都将被删除。
我也不能依赖 LifecycleCallbacks，因为对关系所做的更改不会保留在数据库中。
感谢开源，我找到了一个帖子 here 对我有帮助。
我需要的是一个关于 Doctrine Flush 操作的 EventListener。
namespace MyBundle\EventListener;
use Doctrine\ORM\Event\OnFlushEventArgs;
use MyBundle\Entity\UserGoods;
class EmptyValueListener
{
public function onFlush(OnFlushEventArgs $args)
{
$em = $args->getEntityManager();
$uow = $em->getUnitOfWork();
$entities = array_merge(
$uow->getScheduledEntityInsertions(),
$uow->getScheduledEntityUpdates()
);
foreach ($entities as $entity) {
if ($entity instanceof UserGoods) {
if ($entity && null !== $entity )
{
if ( empty($entity->getValue()) )
{
$users = $entity->getUsers();
foreach ($users as $curruser)
{
$curruser->removeGoods($entity);
$em->remove($entity);
$md = $em->getClassMetadata('MyBundle\Entity\UserGoods');
$uow->computeChangeSet($md, $entity);
$em->persist($curruser);
$md = $em->getClassMetadata('MyBundle\Entity\User');
$uow->computeChangeSet($md, $curruser);
}
}
}
}
}
}
}
并在我的 config.yml 中注册为
mybundle.emptyvalues_listener:
class: MyBundle\EventListener\EmptyValueListener
tags:
- { name: doctrine.event_listener, event: onFlush }