Non-specific Implementation

Only for 'expanded' => false. Not sure if this could be rolled into a meaningful PR. I'd have a go if there was any interest.

Example

$builder
        ->add(
                'incident',
                'extended_entity',
                array(
                    'label' => 'Incident',
                    'class' => 'Vendor\YourBundle\Entity\Incident',
                    'required' => true,
                    // 'option_attributes' injects $incident->getSlug() into each option tag e.g. <option data-slug="foo"...> 
                    'option_attributes' => array('data-slug' => 'slug'), 
                )
            );

Form Type

class ExtendedEntityType extends AbstractType
{
    /**
     * @var PropertyAccessorInterface
     */
    private $propertyAccessor;

    /**
     * @param PropertyAccessorInterface $propertyAccessor
     */
    function __construct(PropertyAccessorInterface $propertyAccessor)
    {
        $this->propertyAccessor = $propertyAccessor;
    }

    /**
     * @param FormView      $view
     * @param FormInterface $form
     * @param array         $options
     */
    public function finishView(FormView $view, FormInterface $form, array $options)
    {
        parent::finishView($view, $form, $options);

        foreach ($view->vars['choices'] as $choice) {
            $additionalAttributes = array();
            foreach ($options['option_attributes'] as $attributeName => $choicePath) {
                $additionalAttributes[$attributeName] = $this->propertyAccessor->getValue($choice->data, $choicePath);
            }

            $choice->attr = array_replace(isset($choice->attr) ? $choice->attr : array(), $additionalAttributes);
        }
    }

    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        parent::setDefaultOptions($resolver);

        $resolver->setDefaults(
            array(
                'option_attributes' => array(),
            )
        );
    }

    /**
     * @return string
     */
    public function getParent()
    {
        return 'entity';
    }

    /**
     * Returns the name of this type.
     *
     * @return string The name of this type
     */
    public function getName()
    {
        return 'extended_entity';
    }
}

Service

services:
    vendor.extended_entity.widget:
        class: Vendor\YourBundle\Form\ExtendedEntityType
        arguments: [@property_accessor]
        tags:
            - { name: form.type, alias: extended_entity }

Form Customization

{% block choice_widget_options %}
{% spaceless %}
    {% for group_label, choice in options %}
        {% if choice is iterable %}
            <optgroup label="{{ group_label|trans({}, translation_domain) }}">
                {% set options = choice %}
                {{ block('choice_widget_options') }}
            </optgroup>
        {% else %}
            <option {% for attrname, attrvalue in choice.attr|default({}) if attrvalue is not empty %}{{ attrname }}="{{ attrvalue }}" {% endfor %} value="{{ choice.value }}"{% if choice is selectedchoice(value) %} selected="selected"{% endif %}>{{ choice.label|trans({}, translation_domain) }}</option>
        {% endif %}
    {% endfor %}
{% endspaceless %}
{% endblock choice_widget_options %}

Uh oh!

[Form] Allow additional HTML attributes to be specified for choices #3836

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