symfony object could not be converted to string - symfony

Question

i'm newbie in symfony and I'm trying to implement a Data Transformer. I followed the documentation and looked different solutions posted in here. But I haven't found what is wrong with my code.
I'm getting this error:
Catchable Fatal Error: Object of class AppBundle\Entity\Todo could not be converted to string
If someone knows another post with the solution, please tell me know where I could look for it.
Thank you in advance.
So, these are my Entities. Todo class
<?php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Todo
*
* #ORM\Table(name="todo")
* #ORM\Entity(repositoryClass="AppBundle\Repository\TodoRepository")
*/
class Todo
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=20)
*/
private $name;
/**
* #var string
*
* #ORM\Column(name="category", type="string", length=20)
*/
private $category;
/**
* #var string
*
* #ORM\Column(name="description", type="string", length=10)
*/
private $description;
/**
* #var string
*
* #ORM\Column(name="priority", type="string", length=10)
*/
private $priority;
/**
*
* #ORM\ManyToOne(
* targetEntity="AppBundle\Entity\User",
* inversedBy="todos"
* )
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $creatorId;
//... getters and setters
User class:
<?php
// src/AppBundle/Entity/User.php
namespace AppBundle\Entity;
use FOS\UserBundle\Entity\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="fos_user")
*/
class User extends BaseUser
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
public function __construct()
{
parent::__construct();
// your own logic
}
/**
* #ORM\OneToMany(
* targetEntity="AppBundle\Entity\Todo",
* mappedBy="creatorId"
* )
*/
private $todos;
}
In the User class, I don't have getter/setters
My TodoType
class TodoType extends AbstractType{
private $manager;
public function __construct(ObjectManager $manager)
{
$this->manager = $manager;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', TextType::class, array(
'label' => 'Name',
'required' => true
)
)
->add('category', TextType::class, array(
'label' => 'Category'
)
)
->add('priority', EntityType::class, array(
'class' => 'AppBundle:Todo',
'choice_label' => 'priority',
)
)
->add('creatorId', TextType::class, array(
'label' => 'creator Id:',
));
$builder->get('creatorId')
->addModelTransformer(new IssueToNumberTransformer($this->manager));
}
public function getName()
{
return 'todo';
}
}
Transformer
<?php
namespace FOS\UserBundle\Form\DataTransformer;
use AppBundle\Entity\User;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
class IssueToNumberTransformer implements DataTransformerInterface
{
private $manager;
public function __construct(ObjectManager $manager)
{
$this->manager = $manager;
}
/**
* Transforms an object (creatorId) to a string (number).
*
* #param creatorId|null $creatorId
* #return string
*/
public function transform($creatorId)
{
if (null === $creatorId) {
return '';
}
return $creatorId->getId();
}
/**
* Transforms a string (number) to an object (creatorId).
*
* #param string $creatorId
* #return creatorId|null
* #throws TransformationFailedException if object (creatorId) is not found.
*/
public function reverseTransform($creatorId)
{
// no issue number? It's optional, so that's ok
if (!$creatorId) {
return;
}
$creatorId = $this->manager
->getRepository('AppBundle:User')
// query for the issue with this id
->find($creatorId);
if (null === $creatorId) {
throw new TransformationFailedException(sprintf(
'A user with number "%s" does not exist!',
$creatorId
));
}
return $creatorId;
}
}
Controller (function)
public function createAction(Request $request){
$em = $this->getDoctrine()->getManager();
// 1) build the form
$todo = new Todo();
$form = $this->createForm(new TodoType($em), $todo);
// 2) handle the submit (will only happen on POST)
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
// 3) save the Todo!
$em->persist($todo);
$em->flush();
return $this->redirectToRoute('todo_create');
}
return $this->render('todo/create.html.twig', array(
'todo'=>$todo,
'form'=>$form->createView()
));
}

Answer 1

It's at this part:
return $this->render('todo/create.html.twig', array(
'todo'=>$todo,
'form'=>$form->createView()
));
Because you are trying to pass the $todo object to your Twig template. You can't do that. What do you need? If you just need the Todo name and you have created getters/setter, you could instead do like this:
return $this->render('todo/create.html.twig', array(
'todo_name' => $todo->getName(),
'form' => $form->createView()
));
Hopefully that makes sense.
EDIT #2 based on comments.
Also this line is wrong in your controller:
$form = $this->createForm(new TodoType($em), $todo);
Should be like this:
$form = $this->createForm(TodoType::class, $todo);