MissingOptionsException: The required option "class" is missing - symfony

Question

I am getting the above error when trying to use a entity field type in a form.
I am using Symfony 2.6.0.
My class has a category field defined as:
/**
* #ORM\ManyToOne(targetEntity="Category", inversedBy="parent")
* #ORM\JoinColumn(name="category_id", referencedColumnName="id")
*/
protected $category;
The category class is defined as:
/**
* #ORM\OneToMany(targetEntity="Parent", mappedBy="category")
*/
protected $parents;
My form type has definition for the category as:
->add('category', 'entity', array(
'class' => 'AppBundle:Category',
'property' => 'name'
In my controller I am calling it with:
->add('category', 'entity')
The stack trace is below:
Symfony\Component\OptionsResolver\Exception\MissingOptionsException: The required option "class" is missing.
at n/a
in \project\vendor\symfony\symfony\src\Symfony\Component\OptionsResolver\OptionsResolver.php line 757
at Symfony\Component\OptionsResolver\OptionsResolver->resolve(array())
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\ResolvedFormType.php line 109
at Symfony\Component\Form\ResolvedFormType->createBuilder(object(FormFactory), 'category', array())
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\Extension\DataCollector\Proxy\ResolvedTypeDataCollectorProxy.php line 82
at Symfony\Component\Form\Extension\DataCollector\Proxy\ResolvedTypeDataCollectorProxy->createBuilder(object(FormFactory), 'category', array())
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\FormFactory.php line 87
at Symfony\Component\Form\FormFactory->createNamedBuilder('category', 'entity', null, array())
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\FormBuilder.php line 106
at Symfony\Component\Form\FormBuilder->create('category', 'entity', array())
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\FormBuilder.php line 268
at Symfony\Component\Form\FormBuilder->resolveChildren()
in \project\vendor\symfony\symfony\src\Symfony\Component\Form\FormBuilder.php line 216
at Symfony\Component\Form\FormBuilder->getForm()
in \project\src\AppBundle\Controller\TheController.php line 78
at AppBundle\Controller\TheController->editAction('30', object(Request))
in line
at call_user_func_array(array(object(TheController), 'editAction'), array('30', object(Request)))
in \project\app\bootstrap.php.cache line 3008
at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), '1')
in \project\app\bootstrap.php.cache line 2970
at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), '1', true)
in \project\app\bootstrap.php.cache line 3119
at Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(object(Request), '1', true)
in \project\app\bootstrap.php.cache line 2364
at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
in \project\web\app_dev.php line 28
Any help would be very much appreciated.
Jay

Answer 1

It looks like you have created a form class, but are recreating the form in the controller rather than using the form class.
In my controller I am calling it with:
->add('category', 'entity')
You should either use the same class and property options as you did in the form class, or better, use the form class in the controller instead of recreating the form.
$this->createForm(new ParentType(), $parent);