Php Doctrine2和cascade persist-调用非对象上的成员函数getId（）

我正在测试Symfony2和Doctrin2中

作业

实体和

类别

实体之间的级联持久性。 这是我的

类别

实体：

<?php
namespace Ibw\JobeetBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Ibw\JobeetBundle\Entity\Affiliate;
use Ibw\JobeetBundle\Entity\Job;
use Ibw\JobeetBundle\Utils\Jobeet;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="Ibw\JobeetBundle\Repository\CategoryRepository")
 * @ORM\Table(name="categories")
 * @ORM\HasLifecycleCallbacks
 */
class Category 
{

    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="string", length=255, unique=true)
     */
    protected $name;

    /**
     * @ORM\OneToMany(targetEntity="Job", mappedBy="category", cascade={"persist"})
     */
    protected $jobs;

    /**
     * @ORM\ManyToMany(targetEntity="Affiliate", mappedBy="categories")
     */
    protected $affiliates;

    /**
     * @ORM\Column(type="string", length=255, unique=true)
     */
    protected $slug;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->jobs = new ArrayCollection();
        $this->affiliates = new ArrayCollection();
    }

    /**
     * Get id
     *
     * @return integer 
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Category
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Add jobs
     *
     * @param Job $jobs
     * @return Category
     */
    public function addJob(Job $jobs)
    {
        $this->jobs[] = $jobs;

        return $this;
    }

    /**
     * Remove jobs
     *
     * @param Job $jobs
     */
    public function removeJob(Job $jobs)
    {
        $this->jobs->removeElement($jobs);
    }

    /**
     * Get jobs
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getJobs()
    {
        return $this->jobs;
    }

    /**
     * Add affiliates
     *
     * @param Affiliate $affiliates
     * @return Category
     */
    public function addAffiliate(Affiliate $affiliates)
    {
        $this->affiliates[] = $affiliates;

        return $this;
    }

    /**
     * Remove affiliates
     *
     * @param Affiliate $affiliates
     */
    public function removeAffiliate(Affiliate $affiliates)
    {
        $this->affiliates->removeElement($affiliates);
    }

    /**
     * Get affiliates
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getAffiliates()
    {
        return $this->affiliates;
    }

    /**
     * Set slug
     *
     * @param string $slug
     * @return Category
     */
    public function setSlug($slug)
    {
        $this->slug = $slug;

        return $this;
    }

    /**
     * Get slug
     *
     * @return string 
     */
    public function getSlug()
    {
        return $this->slug;
    }

    /**
     * @ORM\PrePersist
     * @ORM\PreUpdate
     */
    public function setSlugValue()
    {
        $this->setSlug(Jobeet::slugify($this->getName()));
    }
}

现在，当我尝试使用此测试对其进行测试时：

public function testAddJobToCategory()
    {
        $job = new Job();
         $job->setType('flexible-time');
         $job->setCompany('Sensio Labs');
         $job->setLogo('sensio-labs.gif');
         $job->setUrl('http://www.sensiolabs.com/');
         $job->setPosition('Web Developer');
         $job->setLocation('Paris, France');
         $job->setDescription('You\'ve already developed websites with symfony and you want to work with Open-Source technologies. You have a minimum of 3 years experience in web development with PHP or Java and you wish to participate to development of Web 2.0 sites using the best frameworks available.');
         $job->setHowToApply('Send your resume to fabien.potencier [at] sensio.com');
         $job->setIsPublic(true);
         $job->setIsActivated(true);
         $job->setToken('job');
         $job->setEmail('job@example.com');
         $job->setExpiresAt(new \DateTime('+30 days'));

         $category = $this->em->createQueryBuilder('c')
                        ->select('c')
                        ->from('IbwJobeetBundle:Category', 'c')
                        ->where('c.id = 1')
                        ->getQuery()
                        ->getSingleResult();

        $category->addJob($job);
        $this->em->persist($category);
        $this->em->flush();

        $jobFromQuery = $this->em->createQueryBuilder('j')
                    ->select('j')
                    ->from('IbwJobeetBundle:Job', 'j')
                    ->where('j.type = :type')
                    ->setParameter('type', 'flexible-time')
                    ->setMaxResults(1)
                    ->setFirstResult(1)
                    ->getQuery()
                    ->getSingleResult();


        $this->assertEquals(1, $jobFromQuery->getCategory()->getId());
    }

运行此测试时，出现以下错误：

PHP致命错误：对非对象调用成员函数getId（）

所以我认为它在

$jobFromQuery->getCategory（）->getId（）

部分

getCategory（）

没有设置或是其他什么。

这个条令文件说：

条令只会检查关联的拥有方是否有变更

要完全理解这一点，请记住如何在对象世界中维护双向关联。关联的每一侧有2个引用，这2个引用都表示相同的关联，但可以相互独立地更改。当然，在正确的应用程序中，双向关联的语义由应用程序开发人员正确维护（这是他的责任）。条令需要知道这两个内存引用中哪一个应该持久化，哪一个不应该持久化。这就是拥有/反向概念的主要用途

仅对关联的反面所做的更改将被忽略。确保更新双向关联的双方（或者至少从原则的角度更新拥有方）

双向关联的拥有方是在确定关联状态时“关注”的一方，因此也就是在数据库中是否需要更新关联

---

在您的代码中，您只需执行

$category->addJob（$job）因此您正在反向设置关联。作为被忽略的文档，您至少应该首先执行
$job->setCategory（$category）
。
Hmmm，我可以看到
$job->setCategory（）
解决了所有问题。但是，
$category->addJob（）
有什么用呢？如果你想查看一个类别的每一个作业，那么只用于对象引用，而对于条令来说，相反的一面并不重要
public function testAddJobToCategory()
    {
        $job = new Job();
         $job->setType('flexible-time');
         $job->setCompany('Sensio Labs');
         $job->setLogo('sensio-labs.gif');
         $job->setUrl('http://www.sensiolabs.com/');
         $job->setPosition('Web Developer');
         $job->setLocation('Paris, France');
         $job->setDescription('You\'ve already developed websites with symfony and you want to work with Open-Source technologies. You have a minimum of 3 years experience in web development with PHP or Java and you wish to participate to development of Web 2.0 sites using the best frameworks available.');
         $job->setHowToApply('Send your resume to fabien.potencier [at] sensio.com');
         $job->setIsPublic(true);
         $job->setIsActivated(true);
         $job->setToken('job');
         $job->setEmail('job@example.com');
         $job->setExpiresAt(new \DateTime('+30 days'));

         $category = $this->em->createQueryBuilder('c')
                        ->select('c')
                        ->from('IbwJobeetBundle:Category', 'c')
                        ->where('c.id = 1')
                        ->getQuery()
                        ->getSingleResult();

        $category->addJob($job);
        $this->em->persist($category);
        $this->em->flush();

        $jobFromQuery = $this->em->createQueryBuilder('j')
                    ->select('j')
                    ->from('IbwJobeetBundle:Job', 'j')
                    ->where('j.type = :type')
                    ->setParameter('type', 'flexible-time')
                    ->setMaxResults(1)
                    ->setFirstResult(1)
                    ->getQuery()
                    ->getSingleResult();


        $this->assertEquals(1, $jobFromQuery->getCategory()->getId());
    }