LoginForm

<?php

namespace AdminBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\PasswordType;
use Symfony\Component\Form\FormBuilderInterface;

class LoginForm extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('_username')
            ->add('_password', PasswordType::class)
        ;
    }

    public function getBlockPrefix()
    {
        return 'admin_bundle_login_form';
    }
}