Question

我为preUpdate Post实体创建事件监听器，触发正常，但是当我尝试更新相关实体Category时，它会抛出错误：

Field "category" is not a valid field of the entity "BW\BlogBundle\Entity\Post" in PreUpdateEventArgs.

我的事件监听器代码是：

public function preUpdate(PreUpdateEventArgs $args) {
    $entity = $args->getEntity();
    $em = $args->getEntityManager();

    if ($entity instanceof Post) {
        $args->setNewValue('slug', $this->toSlug($entity->getHeading())); // work fine
        $args->setNewValue('category', NULL); // throw an error
        // other code...

我的帖子实体代码是：

/**
 * Post
 *
 * @ORM\Table(name="posts")
 * @ORM\Entity(repositoryClass="BW\BlogBundle\Entity\PostRepository")
 */
class Post
{

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

    /**
     * @var integer
     *
     * @ORM\ManyToOne(targetEntity="\BW\BlogBundle\Entity\Category")
     * @ORM\JoinColumn(name="category_id", referencedColumnName="id")
     */
    private $category;

    // other code

如何在此EvenetListener中与Category实体一起更新此Post实体，如我的示例所示？

此answer有效，但仅适用于Post更改。但我还需要更改Category实体的某些值，例如：

$entity->getCategory()->setSlug('some-category-slug'); // changes not apply, nothing happens with Category entity.

Answer 1

我猜方法setNewValue仅适用于已更改的字段。也许您的类别已经是NULL。这就是它抛出错误的原因。以下是documentation的示例代码。

 /**
  * Set the new value of this field.
  *
  * @param string $field
  * @param mixed $value
  */
 public function setNewValue($field, $value)
 {
     $this->assertValidField($field);

     $this->entityChangeSet[$field][1] = $value;
 }

 /**
  * Assert the field exists in changeset.
  *
  * @param string $field
  */
 private function assertValidField($field)
 {
     if ( ! isset($this->entityChangeSet[$field])) {
         throw new \InvalidArgumentException(sprintf(
             'Field "%s" is not a valid field of the entity "%s" in PreUpdateEventArgs.',
             $field,
             get_class($this->getEntity())
         ));
     }

如何将EventListener用于与更新相关的实体？

1 个答案: