我正在使用Symfony2和Doctrine2,我有一个需要实现多个数组数组的对象。我想出的唯一解决方案是在主对象和它引用的对象之间创建一个桥对象。
所以这就是我的目标:
/**
* @ORM\Table()
*/
class MyObject
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\OneToMany(targetEntity="CollectionOfObjectX", mappedBy="parent", cascade={"all"})
**/
private $collectionsOfObjectX;
public function __construct() {
$this->collectionsOfObjectX = new ArrayCollection();
}
... (Getters and Setters)
}
这将是对象与其他对象之间的桥梁
/**
* @ORM\Table()
*/
class CollectionOfObjectX
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\ManyToOne(targetEntity="ObjectX", inversedBy="collectionsOfObjectX", cascade={"all"})
* @ORM\JoinColumn(name="parent_id", referencedColumnName="id")
**/
private $parent;
/**
* @ORM\ManyToMany(targetEntity="MyObject", cascade={"all"})
* @ORM\JoinTable(
* joinColumns={@ORM\JoinColumn(name="local_id", referencedColumnName="id")},
* inverseJoinColumns={@ORM\JoinColumn(name="foreign_id", referencedColumnName="id")}
* )
**/
private $items;
public function __construct() {
$this->items = new ArrayCollection();
}
.... (Getters and Setters)
}
这将是引用的对象
/**
* @ORM\Table()
*/
class ObjectX
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
... (Some Properties, Getters and Setters)
}
因此,虽然这有效,但它需要一个Bridge对象来处理MyObject与它引用的任何其他对象之间的每个可能关系,这意味着需要大量重复的代码。
有更好的方法吗?
答案 0 :(得分:1)
Doctrine 2并没有真正提供n-2-n抽象关系。对象A必须是已知类,它应该引用对象B(也是已知类)。
我建议尝试这样的事情来解决问题
/**
* @ORM\Table()
*/
class MyObject
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\OneToMany(targetEntity="CollectionOfObjectXYZ", mappedBy="parent", cascade={"all"})
**/
private $collectionsOfObjectXYZ;
public function __construct() {
$this->collectionsOfObjectXYZ= new ArrayCollection();
}
... (Getters and Setters)
}
注意缺少的注释
/**
* @ORM\Table()
*/
class CollectionOfObjectXYZ
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\ManyToOne(targetEntity="MyObject", inversedBy="collectionsOfObjectXYZ", cascade={"all"})
* @ORM\JoinColumn(name="parent_id", referencedColumnName="id")
**/
private $parent;
private $items;
public function __construct() {
$this->items = new ArrayCollection();
}
public function addItem($item){
/** EDIT : since we store the relation in the final object (X Y Z), we don't need particular annotation here **/
$item->setCollectionOfObjectXYZ($this);
return $this;
}
.... (Getters and Setters)
}
/**
* @ORM\Table()
*/
class ObjectX
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var CollectionOfObjectXYZ
*
* @ORM\ManyToOne(target="CollectionOfObjectXYZ", cascade={"persist"})
*/
private $colletion;
... (Some Properties, Getters and Setters)
}
/**
* @ORM\Table()
*/
class ObjectY
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var CollectionOfObjectXYZ
*
* @ORM\ManyToOne(target="CollectionOfObjectXYZ", cascade={"persist"})
*/
private $colletion;
... (Some Properties, Getters and Setters)
}
如果有帮助,请告诉我。