How to render a checkbox that is checked by default with the symfony2 Form Builder?

Question

I have not found any easy way to accomplish to simply check a Checkbox by default. That can not be that hard, so what am i missing?

Answer 1

In Symfony >= 2.3 "property_path" became "mapped".

So:

$builder->add('checkboxName', 'checkbox', array('mapped' => false,
    'label' => 'customLabel',
    'data' => true, // Default checked
));