问题:

I have a Symfony form custom type for an entity.

I want to customize the code that is executed when the form is submitted, but only for a field.

For example, Symfony will by default call this:

$entity->setFoo($value);

I want to do call instead something like:

$entity->doSomething($value, true);

How can I do that without affecting all other properties that are correctly mapped with the form?

回答1:

You can define your foo field in the form as not mapped and then add listener on the POST_SUBMIT that will call your doSomething() method:

$builder->add('foo', null, array('mapped' => false))
    ;

    $builder->addEventListener(
        FormEvents::POST_SUBMIT,
        function(FormEvent $event) {
            $entity = $event->getForm()->getData();
            $entity->doSomething($event->getForm()->get('foo')->getData(), true);
        }
    );

It will not call $entity->setFoo($value). Instead it will call $entity->doSomething($value, true) as you wished.

回答2:

Check this post about DataMapper (it starts from explaining Value Objects, but link will scroll down to Data Mappers header directly). It's very useful but missed in Symfony docs.