Group form fields in Symfony2

Question

I want to group fields in symfony2. For example wrap them in a div and place headlines in between:

<form>
<div class="step-1">
    <h3>Step 1</h3>
    Field 1
    Field 2
</div>
<div class="step-2">
    <h3>Step 2</h3>
    Field 3
    Field 4
</div>
</form>

The problem is the form got very much fields so i cant render them one by one in the template. Isnt there any option when adding fields? Like:

$form = $this->createFormBuilder()
        ->addGroup('step-1')

Or how can i handle this?

Answer 1

I found out, according to this post(Thanks "n.1" for the link) it is possible to group within controller:

$form = $this->createFormBuilder()
            ->add(
                $this->createFormBuilder()->create('step1', 'form', array('virtual' => true))
                ->add('field1', 'text')
                ->add('field2', 'text')
            )

Which gives following template:

<div class="input-wrapper">
  <label class="required">Step1</label>
  <div id="form_step1">
    <div class="input-wrapper">
      <label class="required" for="form_step1_field1">Field1</label>
      <input id="form_step1_field1" type="text" required="required" name="form[step1][field1]">
      <input id="form_step1_field2" type="text" required="required" name="form[step1][field1]">
    </div>
  </div>
</div>

Which i can theme the way i want to. But also "bschussek" wrote:

The structure in your form class shouldn't necessarily be related to the structure in your layout. You can structure the fields in the HTML in whichever way you like.

So maybe the best practice is not to use the controller for structuring and I should prefer the practice from "n.1"