Symfony forms problem- Variable form does not exist - php

Question

I am building a crud app using symfony 4. Here is the controller code:
<?php
namespace App\Controller;
use App\Entity\Taskslist;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Extension\Core\Type\TextType;
class TodoController extends Controller{
/**
* #Route("/",name="todo_list")
*/
public function listAction(){
$todos=$this->getDoctrine()->getRepository('App:Taskslist')->findAll();
return $this->render('todo/index.html.twig',array('todos' => $todos));
}
/**
* #Route("/todo/create",name="todo_create")
*/
public function createAction(Request $request){
$todo = new Taskslist;
$form = $this->createFormBuilder($todo)
->add('id', TextType::class)
->add('title', TextType::class)
->add('description', TextareaType::class)
// ->add('priority', ChoiceType::class, array('choices' => array('Low' => 'Low', 'Normal' => 'Normal', 'High'=>'High'), 'attr' => array('class' => 'form-control', 'style' => 'margin-bottom:15px')))
// ->add('status', BooleanType::class, array('attr' => array('class' => 'form-control', 'style' => 'margin-bottom:15px')))
->add('Save', SubmitType::class, array('label'=> 'Create Todo'))
->getForm();
$form->handleRequest($request);
if($form->isSubmitted() && $form->isValid()){
$name = $form['id']->getData();
$category = $form['title']->getData();
$description = $form['description']->getData();
//$due_date = $form['status']->getData();
//$name = $form['name']->getData();
//$now = new\DateTime('now');
$todo->setId($name);
$todo->setTitle($category);
$todo->setDescription($description);
$sn = $this->getDoctrine()->getManager();
$sn -> persist($todo);
$sn -> flush();
return $this->redirectToRoute('todo_list');
}
return $this->render('todos/create.html.twig', array(
'form' => $form->createView()
));
}
/**
* #Route("/todo/edit/{id}",name="todo_edit")
*/
public function editAction($id,Request $request){
return $this->render('todo/edit.html.twig');
}
/**
* #Route("/todo/details/{id}",name="todo_details")
*/
public function detailsAction($id){
return $this->render('todo/details.html.twig');
}
}
And here is the edit.html.twig:
{% extends 'base.html.twig' %}
{% if form is defined %}
{% block body %}
{{form_start(form)}}
{{form_widget(form)}}
{{form_end(form)}}
{% endblock %}
{% endif %}
I followed all the tutorials but got this error when i click the edit button :
variable form does not exist.
Although my code steps into the if statement.
Can you please help me?Thanks in advance.i couldn't find any working solution

Answer 1

I think the issue is here:
{% extends 'base.html.twig' %}
{% if form is defined %}
{% block body %}
{{form_start(form)}}
{{form_widget(form)}}
{{form_end(form)}}
{% endblock %}
{% endif %}
use this instead:
{% extends 'base.html.twig' %}
{% block body %}
{{form_start(form)}}
{{form_widget(form)}}
{{form_end(form)}}
{% endblock %}