Symfony2 - Doctrine ArrayCollection方法返回未定义 [英] Symfony2 - Doctrine ArrayCollection methods coming back as undefined

问题描述

这是奇怪的。我有一个可以包含其他相关实体的ArrayCollection的实体。当我使用几个帮助方法来允许我添加/检索单个实体的值时，我得到一个Symfony2异常，告诉我方法没有定义。我正在包括命名空间，所以我很失望的是什么问题。

 命名空间Acme\MyBundle\Entity;代码（名称由于NDA而略有变化） 
 
使用Doctrine\ORM\Mapping作为ORM; 
使用Doctrine\Common\Collections\ArrayCollection; 
 
 // ... 
 
 public function setThing（$ thing）
 {
 $ this-> things-> add（$ thing ）; 
} 
 
 public function getThing（）
 {
 return $ this-> things-> current（）; 
} 
  

真正奇怪的是，它在中抛出异常current（）而不是 add（）：

FatalErrorException：错误：调用未定义的方法Acme\MyBundle\Entity\Thing :: current（）in / home / kevin / www / project / vendor / acme / my-bundle / Acme / MyBundle / Entity / MyEntity。 php line 106

根据错误判断，它看起来不是处理的东西作为ArrayCollection。有没有办法强制的东西成为一个ArrayCollection？我已经有以下内容：

  / ** 
 * @var ArrayCollection东西
 * 
 * @ ORM\OneToMany（targetEntity =Thing，mappedBy =other）
 * / 
 private $ things; 
  

但我不知道还有什么要做。

解决方案

奇怪。我可以通过检查它的底层类型来解决它：

  public function getThing（）
 {
 if（get_type（$ this-> things）==='ArrayCollection'）{
 return $ this-> things-> current（）; 
} else {
 return $ this-> things; 
} 
} 
  

表单现在正确显示，没有例外。

如果有多个相关实体，也可以分配一个ArrayCollection，如果只有一个实体，则将它留作相关实体？ ：耸肩：

This is odd. I have an entity that can contain an ArrayCollection of other, related entities. When I make a couple of helper methods to allow me to add/retrieve the value of a singular entity, I get a Symfony2 exception telling me the method is not defined. I'm including the namespace, so I'm at a loss as to what the problem is. Code (names changed slightly due to a NDA) below:

namespace Acme\MyBundle\Entity;

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

// ...

public function setThing($thing)
{
    $this->things->add($thing);
}

public function getThing()
{
    return $this->things->current();
}

What's really strange is that it's throwing the exception at current() but not add():

FatalErrorException: Error: Call to undefined method Acme\MyBundle\Entity\Thing::current() in /home/kevin/www/project/vendor/acme/my-bundle/Acme/MyBundle/Entity/MyEntity.php line 106

Judging by the error, it looks like it's not treating things as an ArrayCollection. Is there any way to force things to be an ArrayCollection? I already have the following:

/**
 * @var ArrayCollection things
 *
 * @ORM\OneToMany(targetEntity="Thing", mappedBy="other")
 */
private $things;

But I'm not sure what else to do.

解决方案

Odd. I was able to work around it by checking its underlying type:

public function getThing()
{
    if (get_type($this->things) === 'ArrayCollection') {
        return $this->things->current();
    } else {
        return $this->things;
    }
}

The form now appears, correctly, with no exceptions.

Maybe it lazy-assigns an ArrayCollection if there's more than one related entity, and leaves it as just the related entity if there's only one? :shrug:

这篇关于Symfony2 - Doctrine ArrayCollection方法返回未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！