How to customize form field based on user roles in Symfony2/3?

Question

Is there a correct way to customize a form depending on the role of the user that requests it?

My scenario is pretty simple: I need to hide some fields

Answer 1

You could use an option passed to the form builder to say what elements are generated.
This way you can change the content and validation that gets done (using validation_groups).
For example, your controller (assuming roles is an array);
you controller;

$form = $this->createForm(new MyType(), $user, ['role' => $this->getUser()->getRoles()]);

And your form:

setDefaults(array(
            'data_class' => 'AppBundle\Entity\User',
            'validation_groups' => ['create'],
            'role' => ['ROLE_USER']
        ));
    }

    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // dump($options['roles']);
        if (in_array('ROLE_ADMIN', $options['role'])) {
            // do as you want if admin
            $builder
                ->add('name', 'text');
        } else {
            $builder
                ->add('supername', 'text');
        }
    }

    /**
     * @return string
     */
    public function getName()
    {
        return 'appbundle_my_form';
    }

}