views.py

class MyContestForm(ModelForm):
  def __init__(self, request, *args, **kwargs):
    super(MyContestForm, self).__init__(*args, **kwargs)
    user = request.user
    boards_available = Board.objects.filter(author=user, contest_only=True)
    self.fields['boards'].queryset
  
  class Meta:
    model = Contest