How to clean a form which receives multiple files

[guettli]

I am not happy with this snippet from the django docs:


from django.views.generic.edit import FormView
from .forms import FileFieldForm

class FileFieldView(FormView):
    form_class = FileFieldForm
    template_name = 'upload.html'  # Replace with your template.
    success_url = '...'  # Replace with your URL or reverse().

    def post(self, request, *args, **kwargs):
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        files = request.FILES.getlist('file_field')
        if form.is_valid():
            for f in files:
                ...  # Do something with each file.
            return self.form_valid(form)
        else:
            return self.form_invalid(form)


Source: https://docs.djangoproject.com/en/1.11/topics/http/file-uploads/#uploading-multiple-files

My problem: The form instance can't validate the files.

AFAIK in the method form.clean() I don't have a list of files.

I can work around this, but it breaks the nice separation of concerns which
I usually get with the nice django form library :-) 

Imagine my app receives three files. Is there a way to validate these files inside form.clean()?

Regards,
  Thomas Güttler

[m1chael]

I do it this way too and agree that it feels dirty. Curious to hear what others have to say about this!

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[guettli]

thank you very much for your Feedback!

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[Tim Graham]

There's a pull request to allow FileField(multiple=True): https://github.com/django/django/pull/9011