How to set a default value in a Symfony 2 form field?

Question

I\'ve been trying to set up a form with Symfony 2.

So I followed the tutorial and I\'ve created a special class for creating the form and handling the

Answer 1

What you're trying to do here is creating a security hole: anyone would be able to inject any ID in the user_product_id field and dupe you application. Not mentioning that it's useless to render a field and to not show it.

You can set a default value to user_product_id in your entity:

/**
 * @ORM\Annotations...
 */
private $user_product_id = 9000;

Answer 2

Another way is creating a Form Type Extension:

namespace App\Form\Extension;

// ...

class DefaultValueTypeExtension extends AbstractTypeExtension
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        if (null !== $default = $options['default']) {   
            $builder->addEventListener(
                FormEvents::PRE_SET_DATA,
                static function (FormEvent $event) use ($default) {
                    if (null === $event->getData()) {
                        $event->setData($default);
                    }
                }
            );
        }
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefault('default', null);
    }

    public static function getExtendedTypes(): iterable
    {
        yield FormType::class;
    }
}

Now any possible value can be passed as default to any form field:

$form->add('user', null, ['default' => $this->getUser()]);
$form->add('user_product_id', null, ['default' => 1]);

This method is specially useful when you don't have a chance to hook into the initialization process of the bound object.