How to merge 2 form in Symfony2

Question

I'm trying to create a very simple forum with Symfony2.

My entities are: ForumCategory (name, description...) ForumTopic (category_id, title) ForumPost (isFirstPost, body, topic_id, author_id...)

When a user try to create a Topic, I want to display only one form in the same page to create a Topic and the first post message. Like:

• Insert topic title: ...
• Insert topic body (related Post Body): ...

[...]

How can I do that? It's possible merge two form in this case?

Answer 1

Make a form type that contains both of your sub forms.

class MergedFormType

    $builder->add('topic', new TopicFormType());
    $builder->add('post',  new PostFormType());

In your controller just pass an array to MergedFormType

public function myAction()

    $formData['topic'] = $topic;
    $formData['post']  = $post;

    $form = $this->createForm(new MergedFormType(), $formData);