forms - symfony2 表单中的实体未找到错误

Question

我有一个带有 buildForm 的 symfony2 Form CategoryType:

  public function buildForm(FormBuilderInterface $builder, array $options) {

        $builder->add('language', 'entity', array(
                    'class' => 'Evr\HomeBundle\Entity\Language',
                    'property' => 'language'
                        )
                )
                ->add('category', 'text', array('label' => 'category.category', 'required' => true));
    }

如你所料，我有两个实体Category和Language，其中Category是Language的child(一种语言可以有多个类别，一个类别属于1种或0种语言)

类别

<?php

namespace Evr\HomeBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * Category
 *
 * @ORM\Table(name="ev_category")
 * @ORM\Entity
 */
class Category
{
    /**
     * @var integer
     *
     * @ORM\Column(name="category_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

     /**
     * 
     * @ORM\ManyToOne(targetEntity="Language",inversedBy="categories")
     * @ORM\JoinColumn(name="language_id",referencedColumnName="language_id")
     */
    private $language;

    /**
     * @var string
     *
     * @ORM\Column(name="category", type="string", length=255)
     */
    private $category;

    /**
     * @ORM\OneToMany(targetEntity="Subcategory", mappedBy="category")
     */
    protected $subcategories;

    public function __construct(){
        $this->subcategories=new ArrayCollection();
    }

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

       /**
     * Set language
     *
     * @param integer $language
     * @return Category
     */
    public function setLanguage($language) {
        $this->language = $language;

        return $this;
    }

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

    /**
     * Set category
     *
     * @param \string $category
     * @return Category
     */
    public function setCategory($category)
    {
        $this->category = $category;

        return $this;
    }

    /**
     * Get category
     *
     * @return \string 
     */
    public function getCategory()
    {
        return $this->category;
    }

}

语言

<?php

namespace Evr\HomeBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * Language
 *
 * @ORM\Table(name="ev_language")
 * @ORM\Entity
 */
class Language
{
    /**
     * @var integer
     *
     * @ORM\Column(name="language_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="language", type="string", length=128)
     */
    private $language;

    /**
     * @var string
     *
     * @ORM\Column(name="code", type="string", length=10)
     */
    private $code;

    /**
     * @var boolean
     *
     * @ORM\Column(name="direction", type="boolean")
     */
    private $direction;

    /**
     * @ORM\OneToMany(targetEntity="Category", mappedBy="language")
     */
    protected $categories;

     /**
     * @ORM\OneToMany(targetEntity="Country", mappedBy="language")
     */
    protected $countries;

    public function __construct(){
        $this->categories=new ArrayCollection();
        $this->countries=new ArrayCollection();
    }

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

    /**
     * Set language
     *
     * @param string $language
     * @return Language
     */
    public function setLanguage($language)
    {
        $this->language = $language;

        return $this;
    }

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

    /**
     * Set code
     *
     * @param string $code
     * @return Language
     */
    public function setCode($code)
    {
        $this->code = $code;

        return $this;
    }

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

    /**
     * Set direction
     *
     * @param boolean $direction
     * @return Language
     */
    public function setDirection($direction)
    {
        $this->direction = $direction;

        return $this;
    }

    /**
     * Get direction
     *
     * @return boolean 
     */
    public function getDirection()
    {
        return $this->direction;
    }
}

在编辑类别时，我需要将当前值显示在一个表单中，以便用户可以修改并保存。

这里我有一个 Controller editAction()，它的任务是显示编辑形式:

   public function editAction($id) { //id of the category to modify

        $category = $this->getDoctrine()->getRepository('EvrHomeBundle:Category')->find($id); //return the category with id

        $categoryForm = $this->createForm(new CategoryType(),$category); //building the form


        return $this->render('EvrAdminBundle:Categories:edit.html.twig', array('categoryForm' => $categoryForm->createView(), 'category' => $category));
    }//render the form

请记住，CategoryType 有一个类型为 entity 的元素，它在选择框中加载语言。

但是当试图用当前数据(类别和语言)填充表单 CategoryType 时，Symfony 返回一个错误:Entity Not Found

Symfony 没有指定错误发生在哪一行，但我认为它在这一行附近:

$categoryForm = $this->createForm(new CategoryType(),$category); //building the form

因为当我删除 createForm 的第二个参数:$category 时，它会显示一个空表单(就像 add category 表单>/p>

这个问题有解决办法吗？考虑到表单包含实体元素这一事实，我如何使用数据库中的当前数据创建表单。

谢谢

Answer 1

如果您的数据库没有强制执行参照完整性，那么您可以删除一条记录，即使另一条记录指向它(它们应该通过外键链接)。然后，当您尝试获取记录时，它似乎可以工作，但是当您想要访问该实体的属性时(这是对数据库的真正访问发生时)，它找不到具有该 record_id 的实体，因此“找不到实体".

例如:

$user=new User();
$car=$user->getCar();    /*The user had a CAR record assigned with Id = 1 but the record was 
                           deleted.              
                           The record USER still has the id of 1.*/
/*No error up till here*/
$carName=$car->getName();    /*Error occurs because it tries to grab the record with id of 1 
                               which was deleted*/