Symfony3 customize label of EntityType choices - symfony

Question

I search a solution to customize the label of choice of EntityType.
Entities
Post
class Post
{
// ...
/**
* #ORM\ManyToMany(targetEntity="AppBundle\Entity\Item", cascade={"persist"})
*/
private $items;
// ...
}
Item
class Item
{
// ...
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=127)
*/
private $title;
/**
* #var string
*
* #ORM\Column(name="image", type="string", length=255, nullable=true)
*/
private $image;
// ...
public function __toString(){
return $this->title;
}
}
Form
class PostType extends AbstractType
{
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('items', EntityType::class, array(
'class' => 'AppBundle\Entity\Item',
'multiple' => true,
'expanded' => true,
))
;
}
/**
* #param OptionsResolver $resolver
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'AppBundle\Entity\Post'
));
}
}
Result
I know how to modify the DOM to get :
<ul>
<li>
<input type="checkbox" id="post_items_1" name="post[items][]" value="1">
<label for="post_items_1">Item 1</label>
</li>
<li>
<input type="checkbox" id="post_items_2" name="post[items][]" value="2">
<label for="post_items_2">Item 2</label>
</li>
<!-- ... -->
</ul>
But I would like get other informations from the Item choices (like property image) :
<ul>
<li>
<input type="checkbox" id="post_items_1" name="post[items][]" value="1">
<label for="post_items_1">
Item 1
<img src="/uploads/item/lorem.jpg" alt="" /> <!-- path store into item #1 -->
</label>
</li>
<li>
<input type="checkbox" id="post_items_2" name="post[items][]" value="2">
<label for="post_items_2">
Item 2
<img src="/uploads/item/ipsum.jpg" alt="" /> <!-- path store into item #2 -->
</label>
</li>
<!-- ... -->
</ul>
Does anyone have a solution?

Answer 1

Setting a choice_label is what you're looking for:
$builder->add('users', EntityType::class, array(
'class' => 'AppBundle:User',
'choice_label' => 'username',
));
Source: http://symfony.com/doc/current/reference/forms/types/entity.html
If you want to use images in your label, you can customize your form template. You can read about it here:
http://symfony.com/doc/current/cookbook/form/form_customization.html#cookbook-form-theming-methods
http://symfony.com/doc/current/book/forms.html#form-theming