[英]Symfony Media bundle - “Impossible to invoke a method (”id“) on a null variable.”
Environment 环境
Symfony 3.4.4 + FOSBundleUser + Sonata Admin + Media Bundle Symfony 3.4.4 + FOSBundleUser + Sonata Admin +媒体捆绑
Subject 学科
I have installed Media Bundle. 我已经安装了媒体捆绑包。 I have configured it following the steps indicated in the Official documentation.
我已经按照官方文档中指定的步骤进行了配置。
I have created a field in my entity Products to attach a catalog in PDF format. 我在实体产品中创建了一个字段,以附加PDF格式的目录。
I have added in Sonata Adminel field mapping. 我已经在Sonata Adminel字段映射中添加了。
When viewing the list of products in Sonata Admin, there is no problem, but when enter to edit or create a new product, give this error: 在Sonata Admin中查看产品列表时,没有问题,但是在输入以编辑或创建新产品时,出现以下错误:
Impossible to invoke a method ("id") on a null variable.
无法对空变量调用方法(“ id”)。
This is the definition of my field to attach a PDF in my entity 这是在我的实体中附加PDF的字段定义
/**
* @var Media
*
* @ORM\ManyToOne(targetEntity="Application\Sonata\MediaBundle\Entity\Media")
* @ORM\JoinColumns({
* @ORM\JoinColumn(name="fileCatalog_id", referencedColumnName="id")
* })
*/
private $fileCatalog;
This is the mapping of the field in the Sonata Admin form 这是Sonata Admin表单中字段的映射
->add('fileCatalog', 'sonata_type_model_list', array(
'required' => false,
'label'=>'Imagen Español'
), array(
'link_parameters' => array(
'context' => 'default',
'provider' => 'sonata.media.provider.file',
'empty_on_new' => true,
)
)
)
I had the same issue, but in my case, my project is for a multi language site therefore each entities having its supporting Translation entities (using Knp\\DoctrineBehaviors), so what I did was.. I keep the media mapping (ORM) on both site as for example assume Product and ProductTranslation, 我遇到了同样的问题,但就我而言,我的项目是针对多语言站点的,因此每个实体都有其支持的翻译实体(使用Knp \\ DoctrineBehaviors),所以我所做的是。.我保持媒体映射(ORM)处于打开状态例如,两个站点都假定Product和ProductTranslation,
namespace Website\ProductBundle\Entity;
use Knp\DoctrineBehaviors\Model as ORMBehaviors;
class Product implements TranslatableInterface
{
use ORMBehaviors\Translatable\Translatable;
......
......
/**
* @var Media
*
* @ORM\ManyToOne(targetEntity="Application\Sonata\MediaBundle\Entity\Media", cascade={"persist"}, fetch="LAZY")
* @ORM\JoinColumn(referencedColumnName="id", onDelete="SET NULL", nullable=true)
*/
protected $image;
}
namespace Website\ProductBundle\Entity;
use Knp\DoctrineBehaviors\Model as ORMBehaviors;
class ProductTranslation
{
use ORMBehaviors\Translatable\Translation;
......
......
/**
* @var Media
*
* @ORM\ManyToOne(targetEntity="Application\Sonata\MediaBundle\Entity\Media", cascade={"persist"}, fetch="LAZY")
* @ORM\JoinColumn(referencedColumnName="id", onDelete="SET NULL", nullable=true)
*/
protected $image;
}
And thats all I was able to rid off the problem. 这就是我所能解决的所有问题。 and it works fine.
而且效果很好。
In my case I had missed importing ORM into the Media entity class. 就我而言,我错过了将ORM导入Media实体类的过程。
use Doctrine\ORM\Mapping as ORM;
This was all it took to fix. 这就是所有需要解决的问题。
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