text: from django import forms
  from django.utils.translation import ugettext as _
  
  from pretalx.common.forms.widgets import MarkdownWidget
  from pretalx.common.mixins.forms import ReadOnlyFlag
  from pretalx.submission.models import Feedback
  
  
  class FeedbackForm(ReadOnlyFlag, forms.ModelForm):
      def __init__(self, talk, **kwargs):
          super().__init__(**kwargs)
          self.instance.talk = talk
          self.fields['speaker'].queryset = self.instance.talk.speakers.all()
          self.fields['speaker'].empty_label = _('All speakers')
  
      def save(self, *args, **kwargs):
          if (
              not self.cleaned_data['speaker']
              and self.instance.talk.speakers.count() == 1
          ):
              self.instance.speaker = self.instance.talk.speakers.first()
          return super().save(*args, **kwargs)
  
      class Meta:
          model = Feedback
          fields = ['speaker', 'review']
          widgets = {
              'review': MarkdownWidget,
          }
  