old_contents: from rest_framework import serializers, viewsets
  
  from document.models import Document, Kamerstuk, Dossier
  
  
  class DossierSerializer(serializers.HyperlinkedModelSerializer):
      documents = serializers.HyperlinkedRelatedField(read_only=True,
                                                      view_name='document-detail',
                                                      many=True)
  
      class Meta:
          model = Dossier
          fields = ('id', 'dossier_id', 'documents')
  
  
  class DossierViewSet(viewsets.ModelViewSet):
      queryset = Dossier.objects.all()
      serializer_class = DossierSerializer
  
  
  class DocumentSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Document
          fields = ('id', 'dossier', 'raw_type', 'raw_title', 'publisher', 'date_published', 'document_url')
  
  
  class DocumentViewSet(viewsets.ModelViewSet):
      queryset = Document.objects.all()
      serializer_class = DocumentSerializer
  
  
  class KamerstukSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Kamerstuk
          fields = ('id', 'document', 'id_main', 'id_sub', 'type_short', 'type_long')
  
  
  class KamerstukViewSet(viewsets.ModelViewSet):
      queryset = Kamerstuk.objects.all()
      serializer_class = KamerstukSerializer
  
  
new_contents: from rest_framework import serializers, viewsets
  
  from document.models import Document, Kamerstuk, Dossier
  
  
  class DossierSerializer(serializers.HyperlinkedModelSerializer):
      documents = serializers.HyperlinkedRelatedField(read_only=True,
                                                      view_name='document-detail',
                                                      many=True)
  
      class Meta:
          model = Dossier
          fields = ('id', 'dossier_id', 'title', 'documents')
  
  
  class DossierViewSet(viewsets.ModelViewSet):
      queryset = Dossier.objects.all()
      serializer_class = DossierSerializer
  
  
  class DocumentSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Document
          fields = ('id', 'dossier', 'raw_type', 'raw_title', 'publisher', 'date_published', 'document_url')
  
  
  class DocumentViewSet(viewsets.ModelViewSet):
      queryset = Document.objects.all()
      serializer_class = DocumentSerializer
  
  
  class KamerstukSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Kamerstuk
          fields = ('id', 'document', 'id_main', 'id_sub', 'type_short', 'type_long')
  
  
  class KamerstukViewSet(viewsets.ModelViewSet):
      queryset = Kamerstuk.objects.all()
      serializer_class = KamerstukSerializer
  
  
subject: Add dossier title to API