Symfony2 classless form with choices: retrieving submitted data - php

Question

I am having a problem using symfony2 and a classless form with a choice field.
The setup is very, very simple:
$data=array();
$choices=array(1 => 'A thing', 2 => 'This other thing', 100 => 'That other thing');
$fb=$this->createFormBuilder($data);
$fb->add('mythings', 'choice', array(
'choices' => $choices,
'data' => $data,
'required' => false,
'expanded' => true,
'multiple' => true,
'mapped' => false))->
add('save', 'submit', array('label' => 'Save'));
$form=$fb->getForm();
And then...
$request=$this->getRequest();
$form->handleRequest($request);
if($form->isValid())
{
//Go nuts.
}
It is in the "go nuts" part where I am stuck. I actually need to access the selected choices by their original index as given in the $choices array... And I haven't been able to. This is the closest I got:
$submitted_data=$form->get('mythings');
foreach($submitted_data as $key => $value)
{
echo $key.' -> '.$value->getData().'<br />';
}
Which assuming we mark the first and last choices, yields:
0 -> 1
1 ->
2 -> 1
It is absolutely necessary that this be a classless form. How do I access the original index (in our case, 1, 2 or 100) of the choices?.
Thanks a lot.

Answer 1

$form->get('mythings')->getData()
will give you data that you need.
I hope this helps.

Answer 2

It's an issue with field mapping. the data you're passing into the form needs to be applied to the field you're adding ('mythings') so you have to wrap $data in an array as a value to the key 'mythings'.
For example:
$data=array();
$choices=array(1 => 'A thing', 2 => 'This other thing', 100 => 'That other thing');
$fb=$this->createFormBuilder(array('mythings' => $data));
$fb->add('mythings', 'choice', array(
'choices' => $choices,
'required' => false,
'expanded' => true,
'multiple' => true))
->add('save', 'submit', array('label' => 'Save'));
$form=$fb->getForm();

Answer 3

you could try naming the array keys to preserve the actual index
$data=array();
$choices=array('1' => 'A thing', '2' => 'This other thing', '100' => 'That other thing');
$fb=$this->createFormBuilder($data);
$fb->add('mythings', 'choice', array(
'choices' => $choices,
'data' => $data,
'required' => false,
'expanded' => true,
'multiple' => true,
'mapped' => false))->
add('save', 'submit', array('label' => 'Save'));
$form=$fb->getForm();