How to implement custom field validation with mapped false in symfony2?

Question

symfony

Symfony version 2.7 In my form class inherited from AbstractFormType, a field is added
in the buildForm(FormBuilderInterface $builder, array $options) method

$builder->add('passport_media', new OrderPassportMediaType(), [
            'label' => 'Скан паспорта', 'mapped' => false, 'required' => true, 'property_path' => null
        ]);

This is a picture. I validate the entire form with the help of a licener

$builder->addEventListener(FormEvents::POST_SUBMIT, array($this, 'orderListener'));

This of course does not work for the passport_media field. How can I validate so that the field behaves like fields with mapped true? I just want to display an error if the user hasn't uploaded a file.

Answer 1

Lots of options...
1. mapped true (Just adding a field to the entity)
2. Listener (PRE_SUBMIT and other events)
3. As Aleksey Romanenko
suggested 4. ...
In general, file uploads should not intersect with the entity. That is, the entity and the loading process must exist separately. This will make it easier to both work with the entity and work with the file. (But these are the details)

Answer 2

Thanks