old_contents: # -*- coding: utf-8 -*-
  
  from __future__ import unicode_literals
  
  from django import forms
  
  from parler.forms import TranslatableModelForm
  
  from sortedm2m.forms import SortedMultipleChoiceField
  
  from .models import Category, QuestionListPlugin, Question
  
  
  class CategoryAdminForm(TranslatableModelForm):
  
      class Meta:
          model = Category
  
      def clean_slug(self):
          slug = self.cleaned_data['slug']
          translations_model = Category._meta.translations_model
          categories_with_slug = translations_model.objects.filter(slug=slug)
  
          if self.instance.pk:
              # Make sure to exclude references from this master :)
              categories_with_slug = categories_with_slug.exclude(
                  master_id=self.instance.pk)
  
          if categories_with_slug.exists():
              raise forms.ValidationError(
                  'A category with this slug already exists.')
          return slug
  
  
  class QuestionListPluginForm(forms.ModelForm):
  
      questions = SortedMultipleChoiceField(queryset=Question.objects.none())
  
      class Meta:
          model = QuestionListPlugin
  
      def __init__(self, *args, **kwargs):
          super(QuestionListPluginForm, self).__init__(*args, **kwargs)
          questions_field = self.fields['questions']
          questions_field.queryset = Question.objects.language()
  
new_contents: # -*- coding: utf-8 -*-
  
  from __future__ import unicode_literals
  
  from django import forms
  
  from parler.forms import TranslatableModelForm
  
  from sortedm2m.forms import SortedMultipleChoiceField
  
  from .models import Category, QuestionListPlugin, Question
  
  
  class CategoryAdminForm(TranslatableModelForm):
  
      class Meta:
          model = Category
  
      # def clean_slug(self):
      #     slug = self.cleaned_data['slug']
      #     translations_model = Category._meta.translations_model
      #     categories_with_slug = translations_model.objects.filter(slug=slug)
  
      #     if self.instance.pk:
      #         # Make sure to exclude references from this master :)
      #         categories_with_slug = categories_with_slug.exclude(
      #             master_id=self.instance.pk)
  
      #     if categories_with_slug.exists():
      #         raise forms.ValidationError(
      #             'A category with this slug already exists.')
      #     return slug
  
  
  class QuestionListPluginForm(forms.ModelForm):
  
      questions = SortedMultipleChoiceField(queryset=Question.objects.none())
  
      class Meta:
          model = QuestionListPlugin
  
      def __init__(self, *args, **kwargs):
          super(QuestionListPluginForm, self).__init__(*args, **kwargs)
          questions_field = self.fields['questions']
          questions_field.queryset = Question.objects.language()
  
subject: Remove no longer used code