Strange exception when setting up ManyToOne relationship in Symfony 2 and Doctrine - php

Question

I'm getting the following exception when trying to update an entity:
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__\Acme\DemoBundle\Entity\TicketCategory. You can avoid this error by setting the "data_class" option to "Proxies__CG__\Acme\DemoBundle\Entity\TicketCategory" or by adding a view transformer that transforms an instance of class Proxies__CG__\Acme\DemoBundle\Entity\TicketCategory to scalar, array or an instance of \ArrayAccess.
When creating, no problem occurs and the relationship is OK. However, when updating, this strange exception comes up. My entities are setup like this:
class Ticket
{
// ...
/**
* #var TicketCategory
*
* #ORM\ManyToOne(targetEntity="TicketCategory")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
protected $category;
// ...
}
class TicketCategory
{
/**
* #var integer $id
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string $title
*
* #ORM\Column(name="title", type="string", length=255)
* #Assert\NotBlank()
*/
private $title;
// ...
}
Form
class TicketType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', 'text', array(
'error_bubbling' => true,
)
)
->add('category', 'text', array(
'error_bubbling' => true,
)
)
;
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\DemoBundle\Entity\Ticket',
'csrf_protection' => false,
));
}
public function getName()
{
return '';
}
}
Any ideas, guys?

Answer 1

Problem is:
$builder
->add('category', 'text', array(
'error_bubbling' => true,
)
)
;
Field category is declared of type "text", thus you can pass only scalars (string, bool, etc) to it. That is you can only specify properties (of Ticket class) that are scalars.
In Ticket class category it's an entity, so the error occurs.
Without knowing what you want to accomplish, i guess you want to make the user choose a category for the ticket, so i'll do:
$builder
->add('category', 'entity', array(
'label' => 'Assign a category',
'class' => 'Acme\HelloBundle\Entity\TicketCategory',
'property' => 'title',
'multiple' => false
)
)
;
More on entity field type.
EDIT: don't know if you omitted it, but Ticket has no property named "title".