Symfony的開捕致命錯誤：類的appbundle \實體\電子郵件的對象不能轉換爲字符串

Question

我在symfony中新，我創建的附加小DB模式：

電子郵件類：

<?php 

namespace AppBundle\Entity; 

use Doctrine\ORM\Mapping as ORM; 

/** 
* Email 
* 
* @ORM\Table() 
* @ORM\Entity(repositoryClass="AppBundle\Entity\EmailRepository") 
*/ 
class Email extends Service 
{ 

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




    /** 
    * Set emailAddress 
    * 
    * @param string $emailAddress 
    * 
    * @return Email 
    */ 
    public function setEmailAddress($emailAddress) 
    { 
     $this->emailAddress = $emailAddress; 

     return $this; 
    } 

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


} 

，我的服務類：

<?php 

namespace AppBundle\Entity; 

use Doctrine\Common\Collections\ArrayCollection; 

use Doctrine\ORM\Mapping as ORM; 

/** 
* Service 
* 
* @ORM\Table() 
* @ORM\Entity(repositoryClass="AppBundle\Entity\ServiceRepository") 
* @ORM\InheritanceType("JOINED") 
* @ORM\DiscriminatorColumn(name="type", type="string") 
* @ORM\DiscriminatorMap({"newsletter" = "Newsletter", "email" = "Email", "service" = "Service"}) 
* 
*/ 
class Service 
{ 
    /** 
    * @var integer 
    * 
    * @ORM\Column(name="id", type="integer") 
    * @ORM\Id 
    * @ORM\GeneratedValue(strategy="AUTO") 
    */ 
    private $id; 

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


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

    /** 
    * Set serviceTitle 
    * 
    * @param string $serviceTitle 
    * 
    * @return Service 
    */ 
    public function setServiceTitle($serviceTitle) 
    { 
     $this->serviceTitle = $serviceTitle; 

     return $this; 
    } 

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


    /** 
    * @ORM\ManyToOne(targetEntity="Service", inversedBy="children") 
    */ 
    private $parent; 

    /** 
    * @ORM\OneToMany(targetEntity="Service", mappedBy="parent") 
    */ 
    private $children; 
    /** 
    * Constructor 
    */ 
    public function __construct() 
    { 
     $this->children = new \Doctrine\Common\Collections\ArrayCollection(); 
    } 

    /** 
    * Set parent 
    * 
    * @param \AppBundle\Entity\Service $parent 
    * 
    * @return Service 
    */ 
    public function setParent(\AppBundle\Entity\Service $parent = null) 
    { 
     $this->parent = $parent; 

     return $this; 
    } 

    /** 
    * Get parent 
    * 
    * @return \AppBundle\Entity\Service 
    */ 
    public function getParent() 
    { 
     return $this->parent; 
    } 

    /** 
    * Add child 
    * 
    * @param \AppBundle\Entity\Service $child 
    * 
    * @return Service 
    */ 
    public function addChild(\AppBundle\Entity\Service $child) 
    { 
     $this->children[] = $child; 

     return $this; 
    } 

    /** 
    * Remove child 
    * 
    * @param \AppBundle\Entity\Service $child 
    */ 
    public function removeChild(\AppBundle\Entity\Service $child) 
    { 
     $this->children->removeElement($child); 
    } 

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




} 

然後我生成電子郵件污物，這是工作完美，現在其實我是想增加對SERV兩個字段冰（SERVICE TITLE和父服務）

我做什麼，我剛打開電子郵件類型的表單，並增加了（服務名稱和家長服務）兩個字段：

<?php 

namespace AppBundle\Form; 

use Symfony\Component\Form\AbstractType; 
use Symfony\Component\Form\FormBuilderInterface; 
use Symfony\Component\OptionsResolver\OptionsResolverInterface; 

class EmailType extends AbstractType 
{ 
    /** 
    * @param FormBuilderInterface $builder 
    * @param array $options 
    */ 
    public function buildForm(FormBuilderInterface $builder, array $options) 
    { 
     $builder 
      ->add('emailAddress') 
      ->add('serviceTitle') 
      ->add('parent') 
      ; 


    } 

保存後

，當我創建新電子郵件服務的瀏覽器返回異常：

捕致命錯誤：Object類的appbundle \實體\的電子郵件不能被現在我只需要添加父ID在文本框中轉換成字符串

（輸入ŧ YPE文本），但實際上我想用（選擇莉莎），從該用戶可以創建新的服務的時候設置一個父服務，並且具有所有以前創建的服務

這樣的選擇列表

Answer 1

添加__toString（）方法到您的電子郵件類：

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