title: Django validate form based on multiple fields (file fields)
body: <p>Is there a way in django to validate a form based on multiple fields. I have seen some examples where people recommend overriding a form's clean method and raising a ValidationError if it fails to meet your custom validation. The problem for me is that I'm not sure you can check whether or not a file was uploaded from within the clean method. I have only been able to access them using the request objects and you do not have access to the request object within the form's clean method.</p>