Symfony2，教义扩展树：生成“树”类下拉列表选择列表 [英] Symfony2,Doctrine Extensions Tree : Generating a "tree"-like dropdown Select list

问题描述

我有一个使用Tree架构构建的Categories表，使用Doctrine Tree Extension
，它看起来像这样

I have a Categories table, built with Tree architecture, using Doctrine Tree Extension and it looks something like this

id  parent_id   title   lft lvl rgt root
864 (NULL)  Movies  1   0   18  864
865 864 Packs   2   1   3   864
866 864 Dubbed  4   1   5   864

，视觉上像这样：

Movies
|
|
|->Packs
|->Dubbed

生成表单添加评论，并加载类别作为每个电影的下拉列表，所以我在我的电影审查表单类型

now i want to generated form for adding reviews , and loading categories as dropdown list for each movie, so i have in my movie-review form-type-class

public function buildForm(FormBuilder $builder, array $options)
{

    $builder->add('name');
    $builder->add('file');
    $builder->add('cover');
    $builder->add('category','entity',           array('class'=>'Tracker\MembersBundle\Entity\Category', 'property'=>'title', ));           
}

它生成一个普通的下拉菜单，如下所示：

which generates a normal dropdown menu like this:

如何配置我的菜单设置，因此它会像这样生成一个 Tree-Like-dropdown选择？

how can i configure my menu settings, so it generates a Tree-Like-dropdown select like this?

推荐答案

我不知道这是一个好主意：用户将无法输入他们的选择。

I'm not sure this is a good idea : users won't be able to type in their choice.

尚未测试此解决方案，但它应该工作：

Haven't tested this solution, but it should work :

首先，您可以按root和lft值对三个进行排序，以正确显示它，因此添加一个查询构建器：

First, you can sort the three by root and lft value to display it properly, so add a query builder:

'query_builder' => function($er) {
    return $er->createQueryBuilder('c')
        ->orderBy('c.root', 'ASC')
        ->addOrderBy('c.lft', 'ASC');
},

然后，您需要添加一个 getIndentedTitle 方法到您的实体：

Then, you need to add a getIndentedTitle method to your entity:

public function getIndentedTitle() {
    return str_repeat("--", $this->lvl).$this->title;
}

最后，在构建表单时，为您的选项添加一个属性选项，显示虚拟属性indentedTitle而不是标题：

Finally, add a property option to your options when you build the form, to display the virtual property indentedTitle instead of title :

'property' => 'indentedTitle'

请参阅： http://symfony.com/doc/current/reference/forms/types/entity.html

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