Controller & Templates

$taskRepository = new TaskRepository(...);
$tasks = $taskRepository->findAll();

class TaskController {
	/** @Route("/task/{id}/mark-done", name = "task_mark_done") */
	public function markDone(Task $task) { /* ... */ }
}

$task = $taskRepository->ref(1);
$task->editDescription($newDescription);
$task->markDone(new \DateTimeImmutable());
$task->markIncomplete();
$task->delete();

$taskRepository->ref(null)->add($description);

$taskRepository->ref(1)->getState(); // Returns "Done"
$taskRepository->ref(2)->getState(); // Returns "Todo"
$taskRepository->ref(3)->getState(); // Returns "Todo"

// Tasks in the Not Exists state.
$taskRepository->ref(null)->getState(); // Returns "" (ReferenceInterface::NOT_EXISTS)
$taskRepository->ref(10)->getState(); // Returns ""

$taskRepository->ref(null)->add("Foo"); // Adds a task using AUTO INCREMENT.
$taskRepository->ref(10)->add("Bar");   // Adds a task with ID = 10.

$taskRepository->ref(1)->getDescription(); // Returns "Get some chocolate".
$taskRepository->ref(null)->getDescription(); // Throws NotExistsException.
$taskRepository->ref(1000)->getDescription(); // Throws NotExistsException.

<?php // src/Controller/TodoController.php
declare(strict_types = 1);

namespace App\Controller;

use App\StateMachine\Task;
use App\StateMachine\TaskRepository;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;


class TodoController extends AbstractController
{

	/**
	 * @Route("/", name = "index")
	 */
	public function index(Request $request, TaskRepository $taskRepository)
	{
		$form = $this->createTaskForm("add");
		$form->handleRequest($request);

		if ($form->isSubmitted() && $form->isValid()) {
			['description' => $description] = $form->getData();
			$taskRepository->ref(null)->add($description);
			return $this->redirectToRoute('index');
		} else {
			$tasks = $taskRepository->findAll();
			return $this->render("todo.html.twig", [
				"form" => $form->createView(),
				"tasks" => $tasks,
			]);
		}
	}


	/**
	 * @Route("/task/{id}/edit-description", name = "task_edit_description")
	 */
	public function editDescription(Request $request, Task $task)
	{
		$form = $this->createTaskForm("save", $task);
		$form->handleRequest($request);

		if ($form->isSubmitted() && $form->isValid()) {
			['description' => $newDescription] = $form->getData();
			$task->editDescription($newDescription);
			return $this->redirectToRoute("index");
		} else {
			return $this->render("task_edit_description.html.twig", [
				'form' => $form->createView()
			]);
		}
	}


	private function createTaskForm(string $buttonName, ?Task $task = null): FormInterface
	{
		// We should define a TaskType class and use it to create the form,
		// but for now, we will create the form directly using the form builder.
		$formBuilder = $this->createFormBuilder([
			'description'=> $task ? $task->getDescription() : ""
		]);
		$formBuilder->add("description", TextType::class)
			->setRequired(true);
		$formBuilder->add($buttonName, SubmitType::class, ["attr" => ["class" => "add"]]);
		return $formBuilder->getForm();
	}


	/**
	 * @Route("/task/{id}/mark-done", name = "task_mark_done")
	 */
	public function markDone(Task $task)
	{
		$task->markDone(new \DateTimeImmutable());
		return $this->redirectToRoute('index');
	}


	/**
	 * @Route("/task/{id}/mark-incomplete", name = "task_mark_incomplete")
	 */
	public function markIncomplete(Task $task)
	{
		$task->markIncomplete();
		return $this->redirectToRoute('index');
	}


	/**
	 * @Route("/task/{id}/delete", name = "task_delete")
	 */
	public function delete(Task $task)
	{
		$task->delete();
		return $this->redirectToRoute('index');
	}

}