TricksAddType

//Pour exemple mon formulaire a jout de trick
class TricksAddType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // On affiche les champs du builder
        $builder
            ->add('nom', TextType::class)
            ->add('description', TextareaType::class)
            ->add('save', SubmitType::class);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => Tricks::class,
        ));
    }
}

//Mon fichier validation.yaml

App\Form\TricksAddType:
  properties:
    nom:
      - NotBlank: ~
    description:
      - NotBlank: ~
    dateInscription:
      - NotBlank: ~
      - Type: \Datetime