2018-12-11 23:15
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I faced up with some non-ordinary situation for me.

1) I have a dependent list that rendering by Symfony FormType like this: enter image description here

2) Location and Instruction fields are depend from Company field.

3) When I change Company field (onchange event js) then goes ajax request that retrieves data from the database and build a dropdown list.

4) But when form is submitted I have an error: enter image description here

Please help me to resolve this. Thanks in advance.

My formType:

public function buildForm(FormBuilderInterface $builder, array $options)
        ->add('messageText', null, ['required' => false])
        ->add('company', null, [
            'choice_label' => 'name',
            'placeholder' => 'Please select company',
            'required' => true
        ->add('procedure', TextType::class, ['attr' => ['placeholder' => 'Please type code or description'] ])
        ->add('instruction', ChoiceType::class, ['mapped' => false])
        ->add('location', ChoiceType::class, ['mapped' => false])


public function configureOptions(OptionsResolver $resolver)
        'data_class' => InstructionNotification::class

Action from controller:

 * @Route("/admin/api/instructions", name="admin_api_instructions")
 * @param Request $request
 * @return JsonResponse
public function getInstructionsByCompanyId(Request $request)
    $id = $request->get('id');
    if (!$id) {
        return new JsonResponse('No data', 404);

    $instructions = $this->getDoctrine()->getRepository('OctaneBundle:Instruction')->findInstructionsByCompanyId($id);

    return new JsonResponse($instructions);


public function findInstructionsByCompanyId($id)
    $qb = $this->createQueryBuilder('i');
    if ($id) {
            ->where('i.company = :id')
            ->setParameter('id', $id);

    return $qb->getQuery()->getResult();

response from api (i.e.: admin/api/instructions?id=1):

[{"id":2,"label":"First instruction"},{"id":3,"label":"First instruction"}]

If you need any additional information please leave comments below. Thanks

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