Delete all post/tag entries on delete Post

Author: yceruto

src/AppBundle/Controller/Admin/BlogController.php

@@ -177,6 +177,10 @@ public function deleteAction(Request $request, Post $post)
 
         $entityManager = $this->getDoctrine()->getManager();
 
+        // Delete related symfony_demo_post_tag entries. This is necessary for SQLite platform only,
+        // you can remove it for another platform.
+        $post->getTags()->clear();
+
         $entityManager->remove($post);
         $entityManager->flush();