Block not active snip version editing

src/Controller/SnipController.php

@@ -81,6 +81,15 @@ class SnipController extends AbstractController
     {
         $this->denyAccessUnlessGranted(SnipVoter::EDIT, $snip);
 
+        /**
+         * Temporary solution to prevent editing of old versions
+         * It technically fully works, but rendering the version history needs an update first
+         */
+        $isLatest = $snip->getActiveVersion() === $snip->getLatestVersion();
+        if(!$isLatest) {
+            $this->addFlash('error', 'Snip is not the latest version, changes will not be saved.');
+        }
+
         $form = $this->createForm(SnipType::class, $snip);
         $form->add('Save', SubmitType::class);
         if ($snip->getId()) {
@@ -89,6 +98,11 @@ class SnipController extends AbstractController
 
         $form->handleRequest($request);
         if ($form->isSubmitted() && $form->isValid()) {
+            if (!$isLatest) {
+                return $this->redirectToRoute('snip_single', [
+                    'snip' => $snip->getId(),
+                ]);
+            }
             $this->repository->save($snip);
             $this->contentService->update($snip, $form->get('content')->getData());
 

src/Service/SnipParser/Twig/SnipTwigExtension.php

@@ -35,6 +35,9 @@ class SnipTwigExtension extends AbstractExtension
     function snipLink(int $id): string
     {
         $snip = $this->snipRepo->find($id);
+        if ($snip === null) {
+            throw new \Exception(sprintf('Snip not found with id: %d', $id));
+        }
         return sprintf('<a class="btn btn-sm btn-primary" href="%s">%s</a>', $this->snipPath($id), $snip);
     }
 }