How can I store data from entity type selectbox (Symfony)?

Question

I have a select box created with formbuilder:

<select id="form_type" name="form[type]" class="form-control select2 select2-hidden-accessible" tabindex="-1" aria-hidden="true">
  <option value="1">text</option>
  <option value="2">hidden</option>
  <option value="3">password</option>
  <option value="4" selected="selected">icon</option>
  <option value="5">select</option>
</select>

This is how it is created in my controller:

$formBuilder->add('type', EntityType::class, array(
            'attr' => array('class' => 'form-control select2'), 'label' => 'Type',
            'class' => FieldTypes::class,
            'choice_label' => function ($fieldTypes) {
              return $fieldTypes->getName();
              }
            ));

$formBuilder->add('cancel', ButtonType::class, array('label' => 'cancel','attr' => array('class' => 'cancel form-btn btn btn-default pull-right close_sidebar')))
        ->add('save', SubmitType::class, array('label' => 'Save','attr' => array('id' => 'submit-my-beautiful-form','class' => 'form-btn btn btn-info pull-right','style' => 'margin-right:5px')));
        $form = $formBuilder->getForm();

        $form->handleRequest($request);

But when I want to save a selection I get the error message:

Argument 1 passed to App\Entity\Fields::setType() must be an instance of App\Entity\FieldTypes or null, string given, called in /Users/work/project/src/Controller/PagesController.php on line 242

In my entity:

 public function setType(?FieldTypes $type): self
  {
    $this->type = $type;
    return $this;
  }

This is how it it stored:

$entity = $this->getDoctrine()->getRepository($EntityName)->find($data['form[id]']);
$em = $this->getDoctrine()->getManager();
foreach ($fields as $field) {
   $em = $this->getDoctrine()->getManager();
   $func = 'set'.$field['fieldName'];
   $args = $data['form['.$field['fieldName'].']'];
   $entity->$func($args);
}
$em->flush();

Answer 1

Use the method $form->handleRequest($request). It will populate your form using its configuration (it will instanciate a FieldType using the posted id).

Here, you add manually the "raw" value of your select, which is string containing the id of your FieldType.

edit : see the docs