Am I using GroupSequence correctly? Constraints aren't called when validating this form.

MyFormType.php

<?php

class MyFormType extends AbstractType
{
    public funcion buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('username', 'text', [
                'required' => true,
                'validation_groups' => new GroupSequence(['Default', 'Strict']),
                'constraints' => [
                    new NotBlank(),
                    new Length(['min' => 3]),
                    new Regex(['pattern' => '/^[a-zA-Z][a-zA-Z0-9_-]+$/']),
                    new NotForbiddenUsername([
                        'groups' => ['Strict'],
                    ]),
                    new NotExistUsername([
                        'groups' => ['Strict'],
                    ]),
                ],
            ]);
    }
}

What happens if you set the GroupSequence in configureOptions()?

No validation happens anyway.

The validation_groups option is converted in BaseValidatorExtension::configureOptions to an array like this:

[
  'cascadeGroup' => null,
  'groups' => [
    0 => 'Default',
    1 => 'Strict',
  ],
]

Ah! That's a bug. The GroupSequence is cast to an array, when it should simply be wrapped. Can you change the return statement to:

return is_array($groups) ? $groups : array($groups);

and open a PR? Please do also create a test if you have time.

On 2.3, btw.

A workaround for the time being is to set validation_groups to array(new GroupSequence(...)).

Thanks for the workaround, @webmozart! Will open a PR then.

Are you sure the workaround is correct? I tried it, but to no avail.

In FormValidator::validate#L67 there's a in_array($group, $constraint->groups) check which will always fail, since $group is GroupSequence and $contraint->groups will be [Default] or [Strict]…

Ping @webmozart ?

I ran into this issue today with Symfony 2.7.6. Glad that the workaround does work for me. Was the issue already solved?