将单个字段的“必需”信息传递给复合Symfony2表单

Question

I need to enter a pair of date and time in multiple places of my Symfony2 application. To accomplish this, I've created a custom_datetime form type. I'd like to decide whether time is required by occassion, while keeping date required if the whole custom_datetime has a required flag.

class DateTime extends AbstractType
{

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('date', 'text', [
                'attr' => ['required' => true] // Here I maybe should inherit what is passed by the parent form
            ])
            ->add('time', 'text', [
                'attr' => ['required' => $options['time_required']]
            ])
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'time_required' => false
        ));
    }

    public function getName()
    {
        return 'custom_datetime';
    }
}

The custom_datetime is then by other forms. Currently I use it like this:

// date should be entered, time should not -- this does not currently work
$builder->add('dt', 'custom_datetime', ['required' => true, 'time_required' => false]);
// date + time should be entered
$builder->add('dt', 'custom_datetime', ['required' => true, 'time_required' => true]);
// neither of date or time is required
$builder->add('dt', 'custom_datetime', ['required' => false]);

Unfortunately the time field gets the required attribute when rendered in HTML.

What should be done to allow the parent form of custom_datetime to pass "required" information about time field?

Answer 1

You shouldn't use the attr attribute for this.

$builder
    ->add('time', 'text', array('required' => true))