Access Request parameters inside Symfony2 DataTransformer - php

Question

Is it possible to get value from another form field inside DataTransformer for a field?
I can create an invitation linked to an email, then when the user register he must type an invitation code, it will work even if that code is not linked to the email he's entered, because Invitation field is a DataTransformer that checks the value inside DB. I would like to check inside that query, if the email exists.
MainForm
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('invitation', 'invitation_type', array(
'required' => true,
'label' => false,
'attr' => array(
'placeholder' => 'form.invitation_code',
'class' => 'form-control',
)
))
;
}
invitation_type is a service where I inject entityManager to a fieldtype that renders the dataTransformer:
InvitationType
public function buildForm(FormBuilderInterface $builder, array $options)
{
$transformer = new InvitationTransformer($this->entityManager);
$builder->addModelTransformer($transformer);
}
And then the transformer
public function reverseTransform($value)
{
$invitation = $this->entityManager->getRepository('Invitation')
->findOneBy(array(
'code' => $value
));
return $invitation;
}
That's the query, which as I said is working without checking the email value, it would be something like 'email' => $emailValue but, I don't know how to access $emailValue

Answer 1

You can inject your value into transformer
public function buildForm(FormBuilderInterface $builder, array $options)
{
$entity = $builder->getData();
$email = $entity->getEmail();
$transformer = new MyTransformer($email);
$builder->add(
$builder->create('sample', 'choice', array(
'attr' => array('class' => 'test')
))->addModelTransformer($transformer)
)
}
class MyTransformer implements DataTransformerInterface {
private $emailValue;
public function __construct($emailValue)
{
$this->emailValue = $emailValue;
}
public function reverseTransform($value)
{
// Do something with $this->emailValue;
$invitation = $this->entityManager->getRepository('Invitation')
->findOneBy(array('code' => $value));
return $invitation;
}
}

Answer 2

So if someone has the same problem I've found a solution.
First create a service for your custom field type, injecting #request_stack
foo.form.type.invitation:
class: Foo\BarBundle\Form\Type\InvitationType
arguments: [ "#doctrine.orm.entity_manager" ]
tags:
- { name: form.type, alias: invitation_type}
calls:
- [setRequest, [#request_stack]]
Then create your custom field type class, which will inject our Request to the DataTransformer
<?php
namespace Foo\BarBundle\Form\Type;
use Doctrine\ORM\EntityManager;
use Foo\BarBundle\Form\DataTransformer\InvitationTransformer;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\HttpFoundation\RequestStack;
class InvitationType extends AbstractType
{
private $entityManager;
protected $request;
public function __construct(EntityManager $em)
{
$this->entityManager = $em;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$transformer = new InvitationTransformer($this->entityManager, $this->request);
$builder->addModelTransformer($transformer);
}
public function getParent()
{
return 'text';
}
public function getName()
{
return 'invitation_type';
}
public function setRequest(RequestStack $request_stack)
{
$this->request = $request_stack->getCurrentRequest();
}
}
And then our DataTransformer needs to fetch the data, change values to match your requests, of course
<?php
namespace Foo\BarBundle\Form\DataTransformer;
use Doctrine\ORM\EntityManager;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\HttpFoundation\Request;
class InvitationTransformer implements DataTransformerInterface
{
protected $entityManager;
protected $request;
public function __construct(EntityManager $entityManager, Request $request)
{
$this->entityManager = $entityManager;
$this->request = $request;
}
public function transform($value)
{
if (null === $value) {
return null;
}
if (!$value instanceof Invitation) {
throw new UnexpectedTypeException($value, 'Foo\BarBundle\Entity\Invitation');
}
return $value->getCode();
}
public function reverseTransform($value)
{
if (null === $value || '' === $value) {
return null;
}
if (!is_string($value)) {
throw new UnexpectedTypeException($value, 'string');
}
$formData = $this->request->get('registration_form'); // Your MAIN form goes here
$email = $formData['email']; // The value you need
$invitation = $this->entityManager->getRepository('FooBarBundle:Invitation')
->findOneBy(array(
'code' => $value,
'email' => $email
));
if($this->entityManager->getRepository('FooBarBundle:User')->findOneBy(array("invitation" => $invitation))){
return null;
}
return $invitation;
}
}
Now you have access to your parameters bag inside your DataTransformer, piece of cake.