Symfony 4 forms - Variable form does not exist - php

Question

Using Symfony 4 to build a support ticket form:
Created route and functions in page controller
/**
* #Route("/support/ticket")
*/
public function ticket(){
return $this->render('support/ticket/ticket.html.twig');
}
public function new(Request $request)
{
// creates a Ticket and gives it some dummy data for this example
$ticket = new Ticket();
$form = $this->createFormBuilder($ticket)
->add('category', ChoiceType::class, array(
'choices' => array(
'ROMAC eHR' => 1,
'ROMAC Website' => 2,
'ROMAC Guide' => 3,
)
))
->add('comment', TextareaType::class)
->add('save', SubmitType::class, array('label' => 'Submit Ticket'))
->getForm();
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
// $form->getData() holds the submitted values
// but, the original `$task` variable has also been updated
$ticket = $form->getData();
// ... perform some action, such as saving the task to the database
// for example, if Ticket is a Doctrine entity, save it!
// $entityManager = $this->getDoctrine()->getManager();
// $entityManager->persist($task);
// $entityManager->flush();
return $this->redirectToRoute('ticket_success');
}
return $this->render('support/ticket/ticket.html.twig', array(
'form' => $form->createView(),
));
}
And then render the form in the twig template:
{{ form_start(form) }}
{{ form_errors(form) }}
{{ form_row(form.category) }}
{{ form_row(form.comment) }}
{{ form_end(form) }}
When I load the page I get a Symfony error stating that "Variable form does not exist".
I have followed the documentation https://symfony.com/doc/current/forms.html. Where/how can I find the issue?

Answer 1

I assume you get this error while accessing "/support/ticket"
You have "form" variable missing in this function
public function ticket(){
return $this->render('support/ticket/ticket.html.twig');
}
I will suggest to wrap your code in twig template in a "if" block
{% if form is defined %}
{{ form_start(form) }}
{{ form_errors(form) }}
{{ form_row(form.category) }}
{{ form_row(form.comment) }}
{{ form_end(form) }}
{% endif %}
Or you need to adjust your controller functions accordingly