Transform empty iterable object to array instead EmptyObject

[psprokofiev]

If I pass empty Generator to json normalizer, I have {data: {}} in response, but I expect to get {data: []}.
Let's look at \CuyZ\Valinor\Normalizer\Transformer\RecursiveTransformer::defaultTransformer
You make tranformation of generator and check - is it closed or not, if closed - you return empty object, but why?

        if (is_iterable($value)) {
            ...

            if (! $result->valid()) {
                return EmptyObject::get();
            }

            return $result;
        }

Empty generator at response is empty list, isn't it?
How about to replace into

            if (! $result->valid()) {
                return [];
            }

Than response is as expected - just {data: []}.

Btw, removing JSON_FORCE_OBJECT from constructor of JsonNormalizer doesn't resolve the issue.

[grizzm0]

I ran into this myself the other day. We use classes that extends ArrayObject for collections. If it's empty the normalizer returns an empty object instead of an empty array.

The problem here is that both ['foo' => 'bar'] and ['foo'] are iterable.
You'd expect an empty object for the first one and an empty array for the second one.