在 Symfony 3 中获取实体类型的值 [英] Get values of Entity Type in Symfony 3

问题描述

如何获取控制器中下拉字段的值.

How do I get the value of dropdown field in controller.

我有下拉字段，其中数据值来自数据库中的一个表.请看下面的代码.

I have drop down fields where values of data is from one of my table in database. Please see the code below.

class SubAgentType extends AbstractType {

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

        $builder->add('company_id', EntityType::class, array(
            'label' => 'Company',
            'required' => true,
            'class' => 'SwipeBundle:Company',
            'choice_label' => 'name',
            'expanded' => false,
            'multiple' => false,
            'placeholder' => 'Choose a Company',
            'constraints' => array(
                new NotBlank(array("message" => 'Company name is required.')),
            ),            
        )); ../ 

在我的 html.twig 中它工作正常，它正确呈现 html，而有一个数值数字和公司名称.

In my html.twig it works fine, it renders the html correctly whereas there's a value numeric and the name of company.

更新:

<select id="sub_agent_company_id" name="sub_agent[company_id]" required="required">
<option value="" selected="selected">Choose a Company</option>
<option value="20">20 Incorporated</option>
<option value="21">21</option>
<option value="22">22</option>
</select>

问题是实体类型返回的是类公司对象，而不是仅返回下拉列表的值.

The problem is the entity type is returning the class company object instead of the value of a dropdown only.

如何只获取下拉列表的值而不是对象?

How do I get only the values of dropdown instead an object?

这是我的下拉 companyid [![enter image description here][1]][1] 中错误的屏幕截图

here's the screenshot of error in my dropdown companyid [![enter image description here][1]][1]

推荐答案

我猜你需要在 choice_label 内部使用一个匿名函数，才能得到 ids.而且我还认为你应该重命名字段名称，而不是 company_id 简单地输入 company.

I guess you need to use an anonymous function inside choice_label, in order to get the ids. And I also think you should rename the field name, and instead of company_id simply put company.

$builder->add('company', EntityType::class, array(
    //...
    'choice_label' => function($company){
        return $company->getId();
    },
//...

此外，您可能需要在此代码中使用 query_builder 选项，但是在尝试我编写的代码后，您将稍后告诉我们这一点.

Moreover, you may need to use the query_builder option inside this code, but this thing you'll gonna tell us later, after trying the code I wrote.

乐

对于 query_builder.

use use Doctrine\ORM\EntityRepository;
//...
$builder->add('company', EntityType::class, array(
//...
`query_builder` => function(EntityRepository $er){
    return $er->createQueryBuilder('c');
},
'choice_label' => function($company){
    return $company->getId();
},
//...

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