Php 教义2一对多/多对一关系

因此，1:M/M:1关系的工作方式与M:M关系的工作方式不同（很明显），但我认为通过适当的配置，可以获得与M:M关系相同的输出

基本上，我需要将另一个字段（位置）添加到

path\u offer

我一直以为它能正常工作，直到我尝试使用

$path->getOffers（）

，它返回了一个

PersistentCollection

，而不是我认为是强制的（一个

ArrayCollection

）。无论如何，在当前表中，我有两个条目：两个提供给一个路径

$path->getOffers（）

正在返回一个

PathOffer

的

PersistantCollection

，该

PathOffer

只附加了一个

Offer

而不是两个

我的问题是如何真正使用这些类型的关系？因为我在这个项目的许多其他方面都需要它（许多m:m集合也需要定位）

我的代码在下面

Path.php PathOffer.php Offer.php

---

看来你做得对。不要担心

PersistentCollection

/

ArrayCollection

之类的东西——重要的是它们是集合

$Path->getOffers（）

确实应该返回

PathOffer

的集合，并且每个

PathOffer

都应该有一个offer

所以它应该是这样工作的：

//Output a all offers associated with a path, along with the position.
$pathOffers = $path->getOffers();

foreach($pathOffers as $po){
    echo $po->getOffer()->id . ' [' . $po->getPosition() . "]\n";
} 

---

我遗漏了什么吗？

我发现了。希望这篇文章能帮助其他像我一样沮丧的人

Path.php

---

——这是我的数据库条目$path->getOffers（）dumps:object（条令\ORM\PersistentCollection）#755（9）{[“快照”：“条令\ORM\PersistentCollection”：private]=>array（0）{}，表示$pathOffers[0]为空；您能描述一下区别吗？我终于找到了解决方法。您可以查看源代码
[..]

/**
 * @ORM\Entity
 * @ORM\Table(name="path_offer")
 */
class PathOffer
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    protected $id;

    /**
     * @ORM\ManyToOne(targetEntity="Path", inversedBy="offers", cascade={"all"})
     */
    protected $path;

    /**
     * @ORM\ManyToOne(targetEntity="Offer", inversedBy="offers", cascade={"all"})
     */
    protected $offer;

    /**
     * @ORM\Column(type="integer")
     */
    protected $pos;

[..]

[..]

/**
 * @ORM\Entity
 * @ORM\Table(name="offer")
 */
class Offer
{
    /**
     * @var integer
     *
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    protected $id;

    /**
     * @var \ZGoffers\MainBundle\Entity\PathOffer
     *
     * @ORM\OneToMany(targetEntity="PathOffer", mappedBy="path", cascade={"all"})
     */
    protected $paths;

[..]

//Output a all offers associated with a path, along with the position.
$pathOffers = $path->getOffers();

foreach($pathOffers as $po){
    echo $po->getOffer()->id . ' [' . $po->getPosition() . "]\n";
} 

<?php

namespace JStout\MainBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="path")
 */
class Path
{
    /**
     * @var integer
     *
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var \JStout\MainBundle\Entity\PathOffer
     *
     * @ORM\OneToMany(targetEntity="PathOffer", mappedBy="path", cascade={"all"})
     * @ORM\OrderBy({"pos" = "ASC"})
     */
    private $offers;

    [...]

<?php

namespace JStout\MainBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="path_offer")
 */
class PathOffer
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @ORM\ManyToOne(targetEntity="Path", inversedBy="offers", cascade={"all"})
     */
    private $path;

    /**
     * @ORM\ManyToOne(targetEntity="Offer", inversedBy="paths", cascade={"all"})
     */
    private $offer;

    /**
     * @ORM\Column(type="integer")
     */
    private $pos;

    [...]

<?php

namespace JStout\MainBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="offer")
 */
class Offer
{
    /**
     * @var integer
     *
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var \JStout\MainBundle\Entity\PathOffer
     *
     * @ORM\OneToMany(targetEntity="PathOffer", mappedBy="offer", cascade={"all"})
     */
    private $paths;

    [...]

<?php

    [...]

    /**
     * @Extra\Route("/path", name="admin_path")
     * @Extra\Route("/path/{id}/edit", name="admin_path_edit", requirements={"id" = "\d+"})
     * @Extra\Template()
     */
    public function pathAction($id = null)
    {
        $path = $this->_getObject('Path', $id); // this function either generates a new entity or grabs one from database depending on $id

        $form = $this->get('form.factory')->create(new Form\PathType(), $path);
        $formHandler = $this->get('form.handler')->create(new Form\PathHandler(), $form);

        // process form
        if ($formHandler->process()) {
            $this->get('session')->setFlash('notice', 'Successfully ' . ($this->_isEdit($path) ? 'edited' : 'added') . ' path!');
            return $this->redirect($this->generateUrl('admin_path'));
        }

        return array(
            'path' => $path,
            'form' => $form->createView(),
            'postUrl' => !$this->_isEdit($path) ? $this->generateUrl('admin_path') : $this->generateUrl('admin_path_edit', array('id' => $path->getId())),
            'paths' => $this->_paginate('Path'),
            'edit' => $this->_isEdit($path) ? true : false
        );
    }

    [...]

<?php

namespace JStout\MainBundle\Form;

use Symfony\Component\Form\AbstractType,
    Symfony\Component\Form\FormBuilder;

class PathType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder
            ->add('name')
            ->add('title')
            ->add('offers', 'collection', array(
                'type' => new PathOfferType(),
                'allow_add' => true,
                'allow_delete' => true
            ))
            ->add('active');
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'JStout\MainBundle\Entity\Path'
        );
    }
}

<?php

namespace JStout\MainBundle\Form;

use Symfony\Component\Form\AbstractType,
    Symfony\Component\Form\FormBuilder;

class PathOfferType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder
            ->add('offer', 'entity', array(
                'class' => 'JStout\MainBundle\Entity\Offer',
                'query_builder' => function($repository) { return $repository->createQueryBuilder('o')->orderBy('o.name', 'ASC'); },
                'property' => 'name'
            )) 
            ->add('pos', 'integer');
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'JStout\MainBundle\Entity\PathOffer'
        );
    }
}

<?php

namespace JStout\MainBundle\Form;

use JStout\MainBundle\Component\Form\FormHandlerInterface,
    Symfony\Component\Form\Form,
    Symfony\Component\HttpFoundation\Request,
    Doctrine\ORM\EntityManager,
    JStout\MainBundle\Entity\Path;

class PathHandler implements FormHandlerInterface
{
    protected $form;
    protected $request;
    protected $entityManager;

    public function buildFormHandler(Form $form, Request $request, EntityManager $entityManager)
    {
        $this->form = $form;
        $this->request = $request;
        $this->entityManager = $entityManager;
    }

    public function process()
    {
        if ('POST' == $this->request->getMethod()) {
            // bind form data
            $this->form->bindRequest($this->request);

            // If form is valid
            if ($this->form->isValid() && ($path = $this->form->getData()) instanceOf Path) {
                // save offer to the database
                $this->entityManager->persist($path);

                foreach ($path->getOffers() as $offer) {
                    $offer->setPath($path);
                    $this->entityManager->persist($offer);
                }

                $this->entityManager->flush();

                return true;
            }
        }

        return false;
    }
}