How to merge 2 form in Symfony2 - forms

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);

Answer 2

Incase if you are looking to merge forms for 2 entities with one to many or one to one relationship; you will need to use form collection extension of symfony 2 component. for eg: where Task entity has many Tags
class TaskType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('description');
$builder->add('tags', 'collection', array('type' => new TagType()));
}
Rendering can be done this way
{{ form_start(form) }}
<h3>Tags</h3>
<ul class="tags">
{# iterate over each existing tag and render its only field: name #}
{% for tag in form.tags %}
<li>{{ form_row(tag.name) }}</li>
{% endfor %}
</ul>
Further details:
http://symfony.com/doc/2.7/cookbook/form/form_collections.html

Answer 3

You can also map the same entity to multiple merged forms.
$entity = new Form();
$form = $this->get('form.factory')->create(FormType::class, [
'form_builder' => $entity,
'submit_builder' => $entity,
]);
FormType.php
<?php
namespace GenyBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Form\Extension\Core\Type;
use Symfony\Component\OptionsResolver\OptionsResolver;
use GenyBundle\Entity\Form;
class FormType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('form_builder', FormBuilderType::class, [
'data_class' => Form::class,
'label' => false, // Important!
])
->add('submit_builder', SubmitBuilderType::class, [
'data_class' => Form::class,
'label' => false,
])
->add('save', Type\SubmitType::class, [
'label' => 'geny.type.form.save.label',
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'translation_domain' => 'geny',
]);
}
}
FormBuilderType.php
<?php
namespace GenyBundle\Form\Type;
use GenyBundle\Base\BaseType;
use Symfony\Component\Form\Extension\Core\Type;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
class FormBuilderType extends BaseType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title', Type\TextType::class, [
'attr' => [
'placeholder' => 'geny.type.form.title.placeholder',
],
'empty_data' => $this->get('translator')->trans('geny.type.form.title.default', [], 'geny'),
'label' => 'geny.type.form.title.label',
'required' => true,
])
->add('description', Type\TextareaType::class, [
'attr' => [
'placeholder' => 'geny.type.form.description.placeholder',
],
'empty_data' => null,
'label' => 'geny.type.form.description.label',
'required' => false,
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => 'GenyBundle\Entity\Form',
'translation_domain' => 'geny',
]);
}
}
SubmitBuilderType.php
<?php
namespace GenyBundle\Form\Type;
use GenyBundle\Base\BaseType;
use Symfony\Component\Form\Extension\Core\Type;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
class SubmitBuilderType extends BaseType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('submit', Type\TextType::class, [
'attr' => [
'placeholder' => 'geny.type.submit.submit.placeholder',
],
'empty_data' => $this->get('translator')->trans('geny.type.submit.submit.default', [], 'geny'),
'label' => 'geny.type.submit.submit.label',
'required' => true,
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => 'GenyBundle\Entity\Form',
'translation_domain' => 'geny',
]);
}
}
Form.php
<?php
namespace GenyBundle\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use JMS\Serializer\Annotation as Serializer;
use Symfony\Component\Validator\Constraints as Assert;
/**
* #ORM\Table(name="geny_form")
* #ORM\Entity(repositoryClass="GenyBundle\Repository\FormRepository")
* #ORM\ChangeTrackingPolicy("DEFERRED_EXPLICIT")
* #Serializer\ExclusionPolicy("NONE")
*/
class Form
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Id
* #Serializer\Exclude
*/
protected $id;
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=128)
* #Assert\Length(min = 1, max = 128)
* #Serializer\Type("string")
*/
protected $title;
/**
* #var string
*
* #ORM\Column(name="description", type="text", nullable=true)
* #Assert\Length(min = 0, max = 4096)
* #Serializer\Type("string")
*/
protected $description;
/**
* #var ArrayCollection
*
* #ORM\OneToMany(targetEntity="Field", mappedBy="form", cascade={"all"}, orphanRemoval=true)
* #ORM\OrderBy({"position" = "ASC"})
* #Assert\Valid()
* #Serializer\Type("ArrayCollection<GenyBundle\Entity\Field>")
*/
protected $fields;
/**
* #var string
*
* #ORM\Column(name="submit", type="text")
* #Assert\Length(min = 1, max = 64)
* #Serializer\Type("string")
*/
protected $submit;
}
Result: