Populate form from two entities - php

Question

I'm trying to populate form from database by using two entities. Here's the code I use
CategoryType
<?php
namespace AppBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
class CategoryType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('name', 'text');
}
public function configureOptions(OptionsResolver $options)
{
return array(
'data_class' => 'AppBundle\Entity\Category',
);
}
public function getName()
{
return 'questionnaire';
}
}
ProductType
<?php
namespace AppBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
class ProductType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('name', 'text');
}
public function configureOptions(OptionsResolver $options)
{
return array(
'data_class' => 'AppBundle\Entity\Product',
);
}
public function getName()
{
return 'questionnaire';
}
}
CommonType
<?php
namespace AppBundle\Form;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use AppBundle\Form\CategoryType;
use AppBundle\Form\ProductType;
class CommonType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('category', new CategoryType());
$builder->add('product', new ProductType());
}
public function getName()
{
return 'app_common_type';
}
}
DefaultController
<?php
namespace AppBundle\Controller;
use AppBundle\Form\CommonType;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
class DefaultController extends Controller
{
/**
* #Route("/", name="homepage")
*/
public function indexAction(Request $request)
{
$data = $this->getDoctrine()->getRepository('AppBundle:Product')->findOneBy(['id' => 2]);
$form = $this->createForm(new CommonType(), $data);
return $this->render('AppBundle:Default:index.html.twig', ['form' => $form->createView()]);
}
}
But I get this error
The form's view data is expected to be of type scalar, array or an instance of \ArrayAccess, but is an instance of class Proxies\__CG__\AppBundle\Entity\Category. You can avoid this error by setting the "data_class" option to "Proxies\__CG__\AppBundle\Entity\Category" or by adding a view transformer that transforms an instance of class Proxies\__CG__\AppBundle\Entity\Category to scalar, array or an instance of \ArrayAccess.
So what I'm doing wrong and is this the correct way to populate form based on two or more entities?

Answer 1

Your Common form's model data format is an array (as far as no data_class given). So the right data to set is an array with product and category keys:
$product = $this->getDoctrine()->getRepository('AppBundle:Product')->findOneBy(['id' => 2]);
$form = $this->createForm(new CommonType(), ['product' => $product]);