Symfony2 实体字段类型替代“属性"还是“__toString()"?

问题描述

使用 Symfony2 实体字段类型 应该指定 属性选项:

Using Symfony2 entity field type one should specify property option:

$builder->add('customers', 'entity', array(
    'multiple' => true,
    'class'    => 'AcmeHelloBundle:Customer',
    'property' => 'first',
));

但有时这还不够:考虑两个同名客户，因此必须显示电子邮件(唯一).

But sometimes this is not sufficient: think about two customers with the same name, so display the email (unique) would be mandatory.

另一种可能是在模型中实现__toString():

Another possibility is to implement __toString() into the model:

class Customer
{
    public $first, $last, $email;

    public function __toString()
    {
        return sprintf('%s %s (%s)', $this->first, $this->last, $this->email);
    }
}

后者的缺点是您被迫在所有表单中以相同的方式显示实体.

The disadvances of the latter is that you are forced to display the entity the same way in all your forms.

有没有其他方法可以使它更灵活?我的意思是像回调函数这样的东西:

Is there any other way to make this more flexible? I mean something like a callback function:

$builder->add('customers', 'entity', array(
    'multiple' => true,
    'class'    => 'AcmeHelloBundle:Customer',
    'property' => function($data) {
         return sprintf('%s %s (%s)', $data->first, $data->last, $data->email);
     },
));

推荐答案

我发现这真的很有帮助，我用你的代码找到了一个非常简单的方法，所以这里是解决方案

I found this really helpful, and I wound a really easy way to do this with your code so here is the solution

$builder->add('customers', 'entity', array(
'multiple' => true,
'class'    => 'AcmeHelloBundle:Customer',
'property' => 'label',
));

在类 Customer(实体)中

And in the class Customer (the Entity)

public function getLabel()
{
    return $this->lastname .', '. $this->firstname .' ('. $this->email .')';
}

呃瞧:D 该属性从实体而不是数据库中获取其字符串.

eh voila :D the property get its String from the Entity not the Database.

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