Question

我的 Symfony2-Doctrine2 项目中有一个赞实体，其中包含 getDislike（）功能。一旦我检索到一个Like实体并在echo中调用getDislike（）函数，就不会打印任何内容。

echo '<br />'. $like->getDislike(); //Nothing is printed (1, 0, true, false)
echo '<br />'. $like->getId(); // the entity id is printed

如果我在if条件中使用相同的实体调用相同的函数，

if($like->getDislike() == FALSE){ //throw an exception
....}

然后返回以下错误：

A new entity was found through the relationship 'Acme\ArticleBundle\Entity\Article#likes' that
was not configured to cascade persist operations for entity: Acme\ArticleBundle\Entity  
\Like@00000000653f908100000000749fcbfe. Explicitly persist the new entity or configure cascading
persist operations on the relationship. If you cannot find out which entity causes the problem
implement 'Acme\ArticleBundle\Entity\Like#__toString()' to get a clue.

为什么会发生上述错误！我的代码中没有提到Article实体（当然，在学说方案中有许多关系，如同一篇文章，反之亦然）。

有什么想法吗？根据请求，我添加Like实体文件：

namespace Acme\ArticleBundle\Entity;

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


/**
 * Acme\ArticleBundle\Entity\Like
 *
 * @ORM\Table()
 * @ORM\Entity
 */
class Like
{


/**
 * @ORM\ManyToOne(targetEntity="Article")
 * @ORM\JoinColumn(name="article_id", referencedColumnName="id")
 */
protected  $article;    


/**
 * @ORM\Column(type="boolean")
 */
protected  $dislike;      

//.... other fields

/**
 * Set dislike
 *
 * @param boolean $dislike
 */
public function setDislike($dislike)
{
    $this->dislike = $dislike;
}

/**
 * Get dislike
 *
 * @return boolean 
 */
public function getDislike()
{
    return $this->dislike;
}

//.... other methods

}

这是文章实体：

namespace Acme\ArticleBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

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


/**
 * Acme\ArticleBundle\Entity\Article
 *
 * 
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="Acme\ArticleBundle\Repository\ArticleRepository")
 */
class Article
{

/**
 *
 * @ORM\OneToMany(targetEntity="Like", mappedBy="article")
 */
protected  $likes;    

//.... other fields


public function __construct() {
    ...
    $this->likes = new \Doctrine\Common\Collections\ArrayCollection();
    ...   
}    


}

这是控制器代码：

 public function likeDislikeItemAction(){               
    if ($this->get('security.context')->isGranted('IS_AUTHENTICATED_FULLY')){
        $user = $this->get('security.context')->getToken()->getUser();

        $entityType = "AcmeArticleBundle:Article"; // This static for debugging
        $entityId = 1; // This static for debugging         

        $doctrine = $this->getDoctrine();

        $item = $doctrine
            ->getRepository($entityType)
            ->findOneById($entityId);
        if(is_object($item)){
           $itemlikes = $item->getLikes();
           $totvotes = sizeof($itemlikes);
           $numlikes = $this->getNumLikes($itemlikes);
           $numdislikes = $totvotes - $numlikes;


            $dislike_value = 'like'; // This static for debugging                
            if($dislike_value == 'like') $isDislike = FALSE;       
            else $isDislike = TRUE;

            $like =  $this->getLikeDislikeEntity($doctrine, $user, $entityType, $entityId);

            if(is_object($like)) { 
              $test = $like->getDislike();
              echo 'test val ' . $test;
            }
        }
       }
      return NULL;
     }

     private function getLikeDislikeEntity($doctrine, $user, $entityType, $entityId){
       if ($entityType == "AcmeArticleBundle:Article") {
        return $doctrine->getRepository("AcmeArticleBundle:Like")
                    ->findOneBy(array('author' => $user->getId(), 'article' =>$entityId));  
       }
       return null;
    }

Answer 1

最后，我发现了错误。我解释了错误消息（“通过关系'Acme \ ArticleBundle \ Entity \ Article＃likes'找到了一个新实体），所以我把代码放在了：

$itemlikes = $item->getLikes();

在检索Like实体的代码之后，即：

$like =  $this->getLikeDislikeEntity($doctrine, $user, $entityType, $entityId);

然后，错误消失了！也许，问题是我在数据库中打开同一行的两个副本（一个来自使用getLikes()获得的列表，另一个带有获取特定Like实例的函数，即getLikeDislikeEntity）。我必须从getReference()尝试EntityManager，看它是否提供相同的错误！

什么样的问题可能要求Doctrine实体的“级联持续操作”？

1 个答案: