Synfony 2.8 one of the two fields must be filled - forms

Question

I have this form and I want to checked if one of the two fields (numberPlate or expirationDate) is filled.
This is my buildForm:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('type', ChoiceType::class, array(
'choices_as_values' => true,
'required' => true,
'label' => 'Tipo Veicolo',
'empty_data' => '',
'empty_value' => '',
'attr' => array('class'=> 'form-control select2'),
'choices' => array('Auto' => 'Auto', 'Moto' => 'Moto', 'Camper' => 'Camper' ,'Barca' => 'Barca')
))
->add('numberPlate', TextType::class, array(
'label' => 'Targa',
'required' => false,
'attr' => array(
'class'=> 'form-control',
'minlength' => 5,
'maxlength' => 7
)
))
->add('expirationDate', DateTimeType::class, array(
'label' => 'Scadenza',
'widget' => 'single_text',
'input' => 'datetime',
'format' => 'dd/MM/yyyy',
'attr' => array('class'=> 'form-control')
))
;
}

Answer 1

You can ensure one of the fields are not empty, by adding a callback constraint to your entity.
namespace App\Entity;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Context\ExecutionContextInterface;
class YourModel
{
/**
* #Assert\Callback
*/
public function validate(ExecutionContextInterface $context)
{
if (!$this->numberPlate && !$this->expirationDate) {
$context->buildViolation('Targa or Scadenza is required')
//optionally display the error at the numberPlate field, omit to display at the top of the form errors
->atPath('numberPlate')
->addViolation()
;
}
}
}
Then update your Scadenza field as not required.
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
//...
->add('expirationDate', DateTimeType::class, array(
'label' => 'Scadenza',
'required' => false,
'widget' => 'single_text',
'input' => 'datetime',
'format' => 'dd/MM/yyyy',
'attr' => array('class'=> 'form-control')
))
;
}
When the form is submitted it will execute the YourModel::validate method, and if the numberPlate and expirationDate are empty, it will fail $form->isValid().
Be sure to clear your cache after making the changes, to refresh the annotations.
NOTE: This will apply to any/all forms this entity model is used in,
to separate the validation you will need to implement validation groups