Upsert

BeerType.php

<?php

namespace AppBundle\Form;

use AppBundle\Entity\Brewery;
use AppBundle\Entity\State;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\PercentType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\OptionsResolver\OptionsResolver;

use AppBundle\Entity\Beer;

class BeerType extends AbstractType
{

    protected $em;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->em = $entityManager;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name')
            ->add('description')
            ->add('abv', PercentType::class, [
                'scale' => 2
            ])
            ->add('brewery', EntityType::class, [
                'class' => Brewery::class,
                'attr' => [
                    'class' => 'select-two'
                ]
            ])
            ->add('beerType', EntityType::class, [
            'class' => \AppBundle\Entity\BeerType::class,
            'attr' => [
                'class' => 'select-two',
                'data-tags' => true
            ]
        ]);

        $builder->addEventListener(FormEvents::PRE_SUBMIT, function(FormEvent $event){

            $data = $event->getData();

            $tag = $this->em->getRepository(\AppBundle\Entity\BeerType::class)->findOneBy(['name' => $data['beerType']]);

            if(!$tag){

                $beerType = ( new \AppBundle\Entity\BeerType() )->setName($data['beerType']);

                $this->em->persist($beerType);
                $this->em->flush();

                $data['beerType'] = $beerType->getId();

                $event->setData($data);
            }
        });


    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Beer::class
        ]);
    }

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