php - 交响乐与学说 : Undefined index when trying to access one-to-many

Question

我遇到了一些问题。我有 2 节课:汽车订单:

<?php

namespace AppBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Orderdetail;

/**
 * @ORM\Entity
 * @ORM\Table(name="carorder")
 */
class Carorder
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue
     */
    protected $id;
    /**
     * @ORM\OneToMany(targetEntity="Orderdetail", mappedBy="Carorder", cascade={"persist","remove"})
     **/
    protected $orderdetails;

    //Then all the auto genereted setters and getters beneath here

订单详情:

<?php

namespace AppBundle\Entity;

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

/** @ORM\Entity 
 *  @ORM\Table(name="orderdetail")
 */
class Orderdetail
{
     /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue
     */
    protected $id;

    /**
     * @ORM\ManyToOne(targetEntity="Carorder", inversedBy="orderdetails")
     **/
    protected $carorder;
     /**
     * @ORM\Column(type="integer")
     */
    protected $amount;

    //Then all the auto generated setters and getters beneath here

我无法通过 Carorder 访问订单详细信息。例如这个例子，只是thorws

   Undefined index: Carorder 

例子:

    $repository = $this->getDoctrine()->getRepository('AppBundle:Carorder');
    $orders = $repository->findAll();
    $orderdetail = $orders[0]->getOrderdetails()->first();

我不知道是什么原因造成的，所以我希望你们能帮帮我。

Answer 1

您映射了属性Carorder，但您的属性名称是carorder，区分大小写。

正确的映射可能是:

/**
 * @ORM\OneToMany(targetEntity="Orderdetail", mappedBy="carorder", cascade={"persist","remove"})
 **/
protected $orderdetails;