我在Symfony2项目中遇到了ManyToMany关系的Collection表单类型的大问题。
环境: - Symfony 2.0.14 - Doctrine 2.1
以下是一些代码:
发布实体
class Post
{
/**
* @ORM\Id
* @ORM\Column(type="integer")
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\Column(type="string", length=255, nullable=false)
*/
private $title;
/**
* @ORM\ManyToMany(targetEntity="Tag", inversedBy="posts", cascade={"persist"})
* @ORM\JoinTable(name="posts_tags")
*/
private $tags;
public function setTags(\Doctrine\Common\Collections\ArrayCollection $tags)
{
foreach($tags as $tag)
{
$tag->addSnippet($this);
}
}
public function addTag(\My\BlogBundle\Entity\Tag $tags)
{
$this->tags[] = $tags;
}
public function getTags()
{
return $this->tags;
}
标记实体
class Tag
{
/**
* @var integer $id
*
* @ORM\Id
* @ORM\Column(type="integer")
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string $name
*
* @ORM\Column(type="string", length=100, unique=true, nullable=false)
*/
private $name;
/**
* @var Snippet
*
* @ORM\ManyToMany(targetEntity="Post", mappedBy="tags")
*/
private $posts;
public function addSnippet(\My\BlogBundle\Entity\Post $posts)
{
$this->posts[] = $posts;
}
PostType表单类
->add('tags', 'collection', array(
'type' => new TagType(),
'allow_add' => true,
'prototype' => true,
'by_reference' => false,
))
一切正常,但在插入数据库SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'tag1' for key 'UNIQ_6FBC94265E237E06'
中已存在的标记时会引发错误。
你有没有解决这个问题的方法,或者我错过了什么?我的控制器是由app/console
生成的标准CRUD控制器。enter code here
答案 0 :(得分:4)
好吧,我并没有太多关于学说,但似乎你在同一个集合中插入一个具有相同ID /名称的标签。我想你可以在插入
之前检查标签是否存在public function existTags(\Doctrine\Common\Collections\ArrayCollection $tags)
{
foreach($this->tags as $tag)
{
if ( $tag->getID() === $tags->getId() )
return true;
}
return false;
}
然后
public function addTag(\My\BlogBundle\Entity\Tag $tags)
{
if ( !$this->existTag($tags) );
$this->tags[] = $tags;
}
这些是我的模特:
namespace models;
/**
* @Entity
* @Table(name="tag")
*/
class Tag
{
/**
* @Id @Column(type="integer", nullable=false, name="id")
* @GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* @Column(type="string", nullable=false)
*/
protected $name;
public function getId(){ return $this->id; }
public function getName(){ return $this->name; }
public function setId($id){ $this->id = $id; }
public function setName($name){ $this->name = $name; }
}
博客条目:
namespace models;
use \Doctrine\Common\Collections\ArrayCollection;
/**
* @Entity
* @Table(name="entry")
*/
class Entry
{
/**
* @Id @Column(type="integer", nullable=false, name="id")
* @GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* @Column(type="string", nullable=false, name="body")
*/
protected $body;
/**
* @ManyToMany(targetEntity="Tag")
* @JoinTable(name="entry_tagged",
* joinColumns={@JoinColumn(name="entry_id", referencedColumnName="id")},
* inverseJoinColumns={@JoinColumn(name="tag_id", referencedColumnName="id")}
* )
*/
private $tags;
public function __construct(){
$this->tags = new ArrayCollection();
}
public function existTag(models\Tag $tag)
{
foreach($this->tags as $temp)
{
if ( $tag->getID() === $temp->getId() )
return true;
}
return false;
}
public function addTag(models\Tag $tag)
{
if ( !$this->existTag($tag) );
$this->tags->add($tag);
}
public function getId(){ return $this->id; }
public function getBody(){ return $this->body; }
public function getTags(){ return $this->tags; }
public function setId($id){ $this->id = $id; }
public function setBody($body){ $this->body = $body; }
public function setTags($tags){ $this->tags = $tags; }
}
最后,使用的连接表是“entry_tagged”,如下所示:
entry_id | tag_id