Technically, you can (or you should be able to, I'm not so sure after the
recent changes in RF in GWT 2.4), but it might sound like using a sledge
hammer to crack a nut: it'd require using ServiceLayerDecorator on the
server-side (and annotate your getter in your proxy with
@SkipInterfaceValidation).
It'd be far easier to add a getPhotosCount to your server-side object too:
public int getPhotosCount() { return getPhotos().size(); }
Oh, and of course, you can also define a
getAlbumPhotosCount(albumId)→Request<Integer> in your RequestContext and
implement it in your associated service.
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