Cannot generate one web form by attaching two entities to it - symfony

Question

I have a 1 to n relationship so one Brand has many Cars. What I want to do is to create only one web form where all the fields from both of the entities get displayed. To do that I created a form type but I think I'm doing something wrong because I' getting error below when trying to print the form fields in twig. Could anyone tell me where am I doing wrong?
Error:
Method "brand" for object "Symfony\Component\Form\FormView" does not exist in CarBrandBundle:Default:both.html.twig at line 1
Entities:
class BrandEntity
{
protected $name;
protected $origin;
//Followed by getters and setters
/**
* #ORM\ManyToOne(targetEntity="BrandEntity", inversedBy="car")
* #ORM\JoinColumn(name="brand_id", referencedColumnName="id", nullable=false)
* #var object $brand
*/
protected $brand;
}
class CarEntity
{
protected $model;
protected $price;
//Followed by getters and setters
/**
* #ORM\OneToMany(targetEntity = "CarEntity", mappedBy = "brand")
* #var object $car
*/
protected $car;
public function __construct()
{
$this->car = new ArrayCollection();
}
public function addCar(\Car\BrandBundle\Entity\CarEntity $car)
{
$this->car[] = $car;
return $this;
}
public function removeCar(\Car\BrandBundle\Entity\CarEntity $car)
{
$this->car->removeElement($car);
}
}
Form Type:
namespace Car\BrandBundle\Form\Type;
use Car\BrandBundle\Entity\BrandEntity;
use Car\BrandBundle\Entity\CarEntity;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Test\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
class BothType extends AbstractType
{
public function builder(FormBuilderInterface $builder, array $options)
{
$builder
->setAction($options['action'])
->setMethod('POST')
->add('brand', new BrandEntity())
->add('car', new CarEntity())
->add('button', 'submit', array('label' => 'Add'))
;
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
//'data_class' => 'Car\BrandBundle\Entity\CarEntity',
'cascade_validation' => true
));
}
public function getName()
{
return 'both';
}
}
Controller:
namespace Car\BrandBundle\Controller;
use Car\BrandBundle\Form\Type\BothType;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class BothController extends Controller
{
public function indexAction()
{
$form = $this->getFrom();
return $this->render('CarBrandBundle:Default:both.html.twig',
array('page' => 'Both', 'form' => $form->createView()));
}
private function getFrom()
{
return $this->createForm(new BothType(), null,
array('action' => $this->generateUrl('bothCreate')));
}
}
Twig:
{{ form_row(form.brand.name) }}
{{ form_row(form.brand.origin) }}
{{ form_row(form.car.model) }}
{{ form_row(form.car.price) }}

Answer 1

If you want a "car form" in which you need to choose a brand, then the other answer will be ok.
If what you want is a "brand form" in which you can add /edit/delete several cars, then you need to embed a Collection of Forms.
The cookbook answer is here: http://symfony.com/doc/current/cookbook/form/form_collections.html
To render a brand form containing a collection of car forms (1-n relationship):
The form types will look like this:
The brand type
// src/Acme/TaskBundle/Form/Type/BrandType.php
//...
class BrandType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('description');
$builder->add('cars', 'collection', array('type' => new CarType()));
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\BrandBundle\Entity\Brand',
));
}
public function getName()
{
return 'brand';
}
}
The car type:
namespace Acme\CarBundle\Form\Car;
//...
class TagType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('name');
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\CarBundle\Entity\Car',
));
}
public function getName()
{
return 'car';
}
}
Then the controller and the views just like in the cookbook. It's very powerful and easy in the end.

Answer 2

To add entities to a form you must use the entity field type: from the docs
$builder->add('users', 'entity', array(
'class' => 'AcmeHelloBundle:User',
'property' => 'username',
));
In this case, all User objects will be loaded from the database and rendered as either a select tag, a set or radio buttons or a series of checkboxes (this depends on the multiple and expanded values). If the entity object does not have a __toString() method the property option is needed.
Also please post the relationships.