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Symfony2 - change form field using eventListener

I would like some help. I have a form with a drop down list and I need to change the selection based on external input. I think it should work well with eventListener

$builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function(FormEvent $event) use($input){
                $form = $event->getForm();

                // get existin form child
                // modify list of choices

            }

All the samples I've seen use FormEvents only to add a new field, but I need to modify an existing field, but I don't know how to get it.

thanks for the help

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3 answers

While the original question is quite old, let me leave this here if someone else is faced with the need to change a specific field option without repeating all the options:

<?php

$builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
    $form = $event->getForm();

    // Get configuration & options of specific field
    $config = $form->get('field_to_update')->getConfig();
    $options = $config->getOptions();

    $form->add(
        // Replace original field... 
        'field_to_update',
        $config->getType()->getName(),
        // while keeping the original options... 
        array_replace(
            $options, 
            [
                // replacing specific ones
                'required' => false,
            ]
        )
    );
});

Source: https://github.com/symfony/symfony/issues/8513#issuecomment-21868035

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, .

$builder->addEventListener(
        FormEvents::PRE_SET_DATA,
        function(FormEvent $event) use($input){
            $form = $event->getForm();

            $form->add($this->factory->createNamed('name_to_override', 'choice', null,
                 array("choices" => array("choice"=>"value"))
                ));

        }

.

. PHP 5.4, $this Closure PHP 5.3.

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