code: def comments(case_id):
      
      text = request.form['text']
      variant_id = request.form.get('variant_id')
      username = request.form.get('username')
      case_obj = app.db.case(case_id)
      app.db.add_comment(case_obj, text, variant_id=variant_id, username=username)
      return redirect(request.referrer)
docs: Upload a new comment.