code: def file_link(self, instance):
          '''
              Renders the link to the student upload file.
          '''
          sfile = instance.file_upload
          if not sfile:
              return mark_safe('No file submitted by student.')
          else:
              return mark_safe('<a href="%s">%s</a><br/>(<a href="%s" target="_new">Preview</a>)' % (sfile.get_absolute_url(), sfile.basename(), sfile.get_preview_url())f file_link(self, instance):
          '''
              Renders the link to the student upload file.
          '''
          sfile = instance.file_upload
          if not sfile:
              return mark_safe('No file submitted by student.')
          else:
              return mark_safe('<a href="%s">%s</a><br/>(<a href="%s" target="_new">Preview</a>)' % (sfile.get_absolute_url(), sfile.basename(), sfile.get_preview_url()))
docs: Renders the link to the student upload file.