我有一个使用 Symfony 2 中的 Gedmo Tree Doctrine 扩展的分层实体。类别实体的代码是：
<?php
namespace MD\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Symfony\Component\Validator\Constraints as Assert;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use MD\Entity\Extension\Treeable;
/**
* Category
*
* @ORM\Entity(repositoryClass="MD\Entity\Repository\CategoryRepository")
*
* @Gedmo\Tree(type="nested")
*/
class Category
{
/**
* Entity Extensions
*/
use Treeable;
/**
* The ID of the category
*
* @ORM\Id
* @ORM\Column(type="integer")
* @ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* The title of the category
*
* @var string
*
* @ORM\Column(type="string", length=255)
*
* @Assert\NotBlank(message="category.title.not_blank")
* @Assert\Length(
* max=255,
* maxMessage="category.title.length.max"
* )
*/
protected $title;
/**
* The description of the category
*
* @var string
*
* @ORM\Column(type="text")
*
* @Assert\NotBlank(message="category.description.not_blank")
*/
protected $description;
/**
* The parent of the category
*
* @var Category
*
* @ORM\ManyToOne(targetEntity="Category", inversedBy="children")
* @ORM\JoinColumn(name="parent_id", referencedColumnName="id", onDelete="CASCADE")
*
* @Gedmo\TreeParent
*/
protected $parent;
/**
* The children of the category
*
* @var ArrayCollection
*
* @ORM\OneToMany(targetEntity="Category", mappedBy="parent", cascade={"persist"})
* @ORM\OrderBy({"left" = "ASC"})
*/
protected $children;
/**
* The slug of the category
*
* @var string
*
* @ORM\Column(type="string", length=255, unique=true)
*
* @Gedmo\Slug(handlers={
* @Gedmo\SlugHandler(class="Gedmo\Sluggable\Handler\TreeSlugHandler", options={
* @Gedmo\SlugHandlerOption(name="parentRelationField", value="parent"),
* @Gedmo\SlugHandlerOption(name="separator", value="/")
* })
* }, fields={"title"})
*/
protected $slug;
/**
* Constructor
*/
public function __construct()
{
$this->children = new ArrayCollection();
}
/**
* Get the ID of the category
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set the title of the category
*
* @param string $title
*
* @return $this
*/
public function setTitle($title)
{
$this->title = $title;
return $this;
}
/**
* Get the title of the category
*
* @return string
*/
public function getTitle()
{
return $this->title;
}
/**
* Set the description of the category
*
* @param string $description
*
* @return $this
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get the description of the category
*
* @return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set the parent of the category
*
* @param Category $parent
*
* @return $this
*/
public function setParent(Category $parent = null)
{
$this->parent = $parent;
if (null !== $parent) {
$parent->addChild($this);
}
return $this;
}
/**
* Get the parent of the category
*
* @return Category
*/
public function getParent()
{
return $this->parent;
}
/**
* Add a child to the category
*
* @param Category $child
*
* @return $this
*/
public function addChild(Category $child = null)
{
if (!$this->children->contains($child)) {
$this->children->add($child);
$child->setParent($this);
}
return $this;
}
/**
* Get the children of the category
*
* @return ArrayCollection
*/
public function getChildren()
{
return $this->children;
}
/**
* Set the slug of the category
*
* @param string $slug
*
* @return $this
*/
public function setSlug($slug)
{
$this->slug = $slug;
return $this;
}
/**
* Get the slug of the category
*
* @return string
*/
public function getSlug()
{
return $this->slug;
}
/** Magic Methods */
/**
* Return a string representation of the category
*
* @return string
*/
public function __toString()
{
return $this->getTitle();
}
}
给定一个标题为 的类别和一个标题为Bands的子类别，Rock后一个类别在创建时具有bands/rock. 这按预期工作。
但是，当我将 slug 字段添加到表单时，当我编辑实体时，我最初会被bands/rock添加到表单字段中。如果我将其更改为bands/rock-and-roll并提交表单，则 slug 将更新为bands/bands-rock-and-roll，而不是bands/rock-and-roll我所期望的。
如果我编辑类别并将 slug 字段设置为rock-and-roll，然后提交表单，则 slug 将更新为bands/rock-and-roll。我希望蛞蝓rock-and-roll在更新之后。
我需要做什么来解决这种行为？如果没有提供，我本质上希望使用处理程序自动生成 slug，但如果我确实提供了它，则将其设置为我提供的内容。
谢谢