How to enable multiple choice in symfony2 form field: collection

Question

I have a user registration form (that the admin uses) and I want to include the choices for role. I have successfully added a drop-down of roles with the following code in my buildForm function:

    $builder
        ->add('roles', 'collection', array(
            'type'   => 'choice',
            'options'  => array(
                'choices'  => array(
                    'ROLE_CONTENT' => 'Innehåll',
                    'ROLE_LAYOUT'     => 'Skärmlayout',
                    'ROLE_VIDEO'    => 'Videouppladdning',
                    'ROLE_ADMIN'    => 'Administratör',
                ),
            ),
    ));

Now, I want this to be a multichoice or list of checkboxes instead of a dropdown, but I can't seem to find a way, seems like a simple enough thing to do or am I missing something about how this field type works, can it not take multiple choices?

Solution

You don't need the collection type here. The choice type with "multiple" set to true will output a collection just fine.

$builder
    ->add('roles', 'choice', array(
        'expanded' => true,
        'multiple' => true,
        'choices'  => array(
            'ROLE_CONTENT' => 'Innehåll',
            'ROLE_LAYOUT'  => 'Skärmlayout',
            'ROLE_VIDEO'   => 'Videouppladdning',
            'ROLE_ADMIN'   => 'Administratör',
        ),
    ))
;

Comments

[mmoreram]

This is not true. Collection extends FormType, not ChoiceType. symfony.com/doc/current/reference/forms/types/collection.htm‌​l