Symfony主义-如何生成optgroup选择表单 [英] Symfony Doctrine - how to generate optgroup select form

问题描述

在symfony2中，我想生成多选选择。
我想得到这样的东西：

In symfony2 I would like to generate multiselect selections. I would like to get something like this :

 <select>
  <optgroup label="district 1">
    <option>city 1</option>
    <option>city 2</option>
  </optgroup>
  <optgroup label="district 2">
    <option>city X</option>
    <option>city Y</option>
  </optgroup>
</select>

我的位置实体为：

class Location
{
    /**
     * @var integer
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;
    /**
    * @ORM\ManyToOne(targetEntity="Location", inversedBy="children")
    * @ORM\JoinColumn(name="pid", nullable=true)
    */
    protected $parent;
    /**
    * @ORM\OneToMany(targetEntity="Location", mappedBy="parent")
    */
    protected $children;    
    /**
     * @var string
     * @ORM\Column(name="name", type="string", length=255)
     */
    protected $name;

所以mysql看起来像：

so mysql looks like :

id, pid, name
1, null, district 1
2, null, district 2
3, 1, city 1
4, 1, city 2
5, 2, city X
6, 2, city Y

有人可以帮我吗？

推荐答案

thx给a.aitboudad和我的一个朋友，我找到了解决方案。

thx to a.aitboudad and a friend of mine I have found the solution.

我必须输入Locaton实体：

I had to type into my Locaton entity :

    public function getParentName() { 
    return $this->getParent() ? $this->getParent()->getName() : null;         
}

然后我通过以下方式生成表单：

then I generated my form by :

$builder->add('locations', 'entity', array(
                'class' => 'MyBundle:Location',
                'group_by' => 'parentName',
                'property' => 'name',
                'query_builder' => function (\Doctrine\ORM\EntityRepository $repo) {
                     $qb = $repo->createQueryBuilder('l');
                     $qb->andWhere('l.parent IS NOT NULL');

                     return $qb;
                }
            ))  

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