Symfony 3 easyadmin __toString() 不得抛出异常

Question

我正在使用 EasyAdmin 捆绑包。当我尝试在名为 "Company" 的实体中添加一个与 "Service" 实体具有 'ManyToMany' 关系的新元素时，我收到错误消息：

Error: Method AppBundle\Entity\Service::__toString() must not throw an exception

但是当我要在 "Service" 实体中添加一个新元素时，一切正常并且具有 "Company" 个实体的字段显示正确。

我试图捕获实施 this 解决方法的异常，但它没有生效。

服务class：

namespace AppBundle\Entity;

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

/**
 * Company
 *
 * @ORM\Table(name="company")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\CompanyRepository")
 */
class Company
{

/**
     * @var
     * 
     * Many Companys have Many Services.
     * @ORM\ManyToMany(targetEntity="Service", inversedBy="companys")
     * @ORM\JoinTable(name="companys_services")
     */
    private $services;

    public function __construct() {
        $this->services = new ArrayCollection();
    }
public function __toString() 
    {
        return $this->name;
    }
}

和服务 class：

namespace AppBundle\Entity;

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

/**
 * Service
 *
 * @ORM\Table(name="service")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\ServiceRepository")
 */
class Service
{
/**
     * Many Services have Many Companys.
     * @ORM\ManyToMany(targetEntity="Company", mappedBy="services")
     */
    private $companys;

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

    public function __toString() 
    {
        return (string) $this->name;
    }
}

怎么了？

Answer 1

错误消息非常具体 (Service::__toString() must not throw an exception)，问题一定在 Service 的 $this->name 属性中。它被定义了吗？ "normal" 属性或某些高级对象在将其转换为字符串时失败了吗？

Symfony 3 easyadmin __toString() 不得抛出异常

Symfony 3 easyadmin __toString() must not throw an exception

php

symfony

symfony2-easyadmin