Placeholder widget not selected by default in Choice field when expanded = true

[wiistriker]

I have such field:

->add('foo', 'choice', [
    'required' => false,
    'expanded' => true,
    'choices' => [
        'foo' => 'Foo',
        'bar' => 'Bar'
    ],
    'placeholder' => 'Placeholder'
])

Why my placeholder radio isn't selected? Is it expected behaviour? I also trying to set required => true for my field

[flobb]

In your controller, when you create the form, you can add the initial data (the second argument of the createForm method).
Which initial data are you using ?

[wiistriker]

@florianbelhomme empty array for this example

[petrulis]

Placeholder can't be selected as default value. You can create choice with empty value.

    ->add('foo', 'choice', [
        'required' => false,
        'expanded' => true,
        'choices' => [
            '' => 'Placeholder',
            'foo' => 'Foo',
            'bar' => 'Bar'
        ],
    ])

Also keep in mind that placeholder for ChoiceType will be added only if choices doesn't contain empty value.

    // Check if the choices already contain the empty value
    // Only add the placeholder option if this is not the case
    if (null !== $options['placeholder'] && 0 === count($options['choice_list']->getChoicesForValues(array('')))) {
        $placeholderView = new ChoiceView(null, '', $options['placeholder']);

        // "placeholder" is a reserved name
        $this->addSubForm($builder, 'placeholder', $placeholderView, $options);
    }

[javiereguiluz]

Closing it because @PetrulisDotPro's comment showed how to solve this issue.