Symfony 2.6 - 按名称呈现个人选择字段（收音机，复选框）

How can I render an individual field (single radio/checkbox input field) in Twig in Symfony 2.6?

Let's say I have a simple form:

class TransportType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
            $builder->add('transport', 'choice', array(
                'choices' => array(
                    'road' => 'Car/bus',
                    'train' => 'Train',
                ),
                'expanded' => true,
                'multiple' => false
            ));
    }

In previous Symfony2 versions I could just use:

{{ form_widget(form.transport.road) }}
{{ form_widget(form.transport.train) }}

to render individual radio buttons, but it doesn't seem to work anymore. I know I can use:

{{ form_widget(form.transport[0]) }}
{{ form_widget(form.transport[1]) }}

but it's less flexible. Of course I can iterate over the collection and check for name, but this seems like unnecessary hassle. Isn't there an easier way?

I tried offsetGet (which is supposed to return a child by name), but it also works only with array index.

It appears this is not possible with the latest versions of Symfony (i.e. >= 2.6). I recall in previous versions, when the form builder displayed the choices array, it was generating the choices like this:

<select>
    <option value="road">Car/Bus</option>
    <option value="train">Train</option>
</select>

This, however, has been changed in the recent versions to the following:

<select>
    <option value="0">Car/Bus</option>
    <option value="1">Train</option>
</select>

The selected option is then normalized and then you get the expected value you've set in the FormType class. You can read more about normalization here.

Also, If you write {{ debug(form.transport) }} in Symfony >= 2.6, you can see the form/field array and what you can use from it.

Since Symfony 2.7 you can set choices forms name through the choice_name option.

Try this:

{% for key, transportItem in form.transport.children %}
    {{ form_widget(transportItem) }}
{% endfor %}

here my solution i used in my own project

{{form_label(form.transport)}}

 {% for key, item in form.transport.children %}
    <div class="custom-radio">
        <label for="{{item.vars.id}}">{{item.vars.label}}</label>
        <input 
            type="radio" 
            value="{{item.vars.value}}" 
            id=" {{item.vars.id}}" 
            name="{{item.vars.full_name}}" 
           {{ item.vars.checked ? 'checked' : '' }} 
        >
   </div>
{% endfor %}

or you can use a form theming

{% form_theme form _self %}

{%- block choice_widget_expanded -%}
    {%- for child in form %}
        <div class="custom-radio">
            {{- form_label(child) -}}
            {{- form_widget(child) -}}
        </div>
    {% endfor -%}
{%- endblock choice_widget_expanded -%}


{{form_widget(form)}}