Signal/event once file has been downloaded?

[devidw]

When applications want to indicate to users whether they have seen/downloaded a document or not, this would probably happen with the help of a boolean has_been_downloaded model field on the corresponding model.

To actually turn this field true once a document has been downloaded, it would be really helpful if the package could send a signal, offer a hook, that gets triggered, when a document was shipped successfully.

I guess this could be implemented with some custom code in a custom view that wraps one of the package views.

DRF example:

    @action(detail=True)
    def download(self, request, pk):
        document = self.get_object()

        # When the owner downloads the document, we want to update the
        # has_been_downloaded field correspondingly
        if document.has_been_downloaded is False:
            document.has_been_downloaded = True
            document.save()

        return ObjectDownloadView.as_view(
            model=Document,
        )(request, pk=pk)

But this would always happen before the actual download code runs and therefore, when the download somehow fails, data would wrongly be changed in the model.