Wsrtjtyk

Suppose I have two entities: a post and a comment. Each post can have many comments. Now, suppose I have a comment form. It is supposed to take user input and store it in the database.

Simple stuff. At least, it should be, but I can't get it to work.

How do I refer to the post (parent) when creating the comment (child)? I tried manually passing the post_id to the comment form as a hidden field, but received an error complaining about how the post ID is a string.

Expected argument of type "AppEntityPost or null", "string" given.

Here is my code so far. Can someone nudge me into the right direction?

CommentType.php

public function buildForm(FormBuilderInterface $builder, array $options)

{

    $post_id = $options['post_id'];



    $builder->add('content', TextareaType::class, [

        'constraints' => [

            new AssertNotBlank(['message' => 'Your comment cannot be blank.']),

            new AssertLength([

                'min'        => 10,

                'minMessage' => 'Your comment must be at least {{ limit }} characters long.',

            ]),

        ],

    ])->add('post', HiddenType::class, ['data' => $post_id]);

}



public function configureOptions(OptionsResolver $resolver)

{

    $resolver->setDefaults([

        'data_class' => Comment::class,

        'post_id' => NULL,

    ]);

}

PostController.php (this is where the comment form appears)

// Generate the comment form.

$comment = new Comment();

$form = $this->createForm(CommentType::class, $comment, [

    'action' => $this->generateUrl('new_comment'),

    'post_id'   => $post_id,

]);

CommentController.php

/**

 * @param Request $request

 * @Route("/comment/new", name="new_comment")

 * @return

 */

public function new(Request $request, UserInterface $user)

{

    // 1) Build the form

    $comment = new Comment();

    $form = $this->createForm(CommentType::class, $comment);



    // 2) Handle the submit (will only happen on POST)

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid())

    {

        // 3) Save the comment!

        $entityManager = $this->getDoctrine()->getManager();

        $entityManager->persist($comment);

        $entityManager->flush();

    }



    return $this->redirectToRoute('homepage');

}

Thank you very much for your help!

You just need to pass the actual Post entity, not just the id. Try this:

CommentController.php

public function new(Request $request, UserInterface $user, PostInterface $post)

{

    // 1) Build the form

    $comment = new Comment();

    $comment->setPost($post); //where $post is instance of AppEntityPost

    $form = $this->createForm(CommentType::class, $comment);



    // 2) Handle the submit (will only happen on POST)

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid())

    {

        // 3) Save the comment!

        $entityManager = $this->getDoctrine()->getManager();

        $entityManager->persist($comment);

        $entityManager->flush();

    }



    return $this->redirectToRoute('homepage');

}

CommentType

public function buildForm(FormBuilderInterface $builder, array $options)

{

    //don't need to set the $post here



    $builder->add('content', TextareaType::class, [

        'constraints' => [

            new AssertNotBlank(['message' => 'Your comment cannot be blank.']),

            new AssertLength([

                'min'        => 10,

                'minMessage' => 'Your comment must be at least {{ limit }} characters long.',

            ]),

        ],

    ])->add('post', HiddenType::class, ['data' => $post_id]);

}



public function configureOptions(OptionsResolver $resolver)

{

    $resolver->setDefaults([

        'data_class' => Comment::class

         //don't need the default here either

     ]);

}