old_contents: from rest_framework.fields import SerializerMethodField
  from rest_framework.serializers import ModelSerializer, CharField, UUIDField
  
  from alexa.settings import RADIO_LINK_BASE
  from yle.models import News
  
  
  class NewsSerializer(ModelSerializer):
  
      uid = UUIDField(source='uuid')
      updateDate = CharField(source='modified')
      titleText = CharField(source='title')
      streamUrl = CharField(source='audio_url')
      mainText = CharField(source='content')
      redirectionUrl = SerializerMethodField('get_redirection')
  
      def get_redirection(self, obj):
          return RADIO_LINK_BASE + obj.external_id
  
      class Meta:
          model = News
          fields = ['uid', 'updateDate',
                    'titleText', 'streamUrl',
                    'mainText', 'redirectionUrl']
  
new_contents: from rest_framework.fields import SerializerMethodField
  from rest_framework.serializers import ModelSerializer, CharField, UUIDField
  
  from alexa.settings import RADIO_LINK_BASE
  from yle.models import News
  
  
  class NewsSerializer(ModelSerializer):
  
      uid = UUIDField(source='uuid')
      updateDate = CharField(source='created')
      titleText = CharField(source='title')
      streamUrl = CharField(source='audio_url')
      mainText = CharField(source='content')
      redirectionUrl = SerializerMethodField('get_redirection')
  
      def get_redirection(self, obj):
          return RADIO_LINK_BASE + obj.external_id
  
      class Meta:
          model = News
          fields = ['uid', 'updateDate',
                    'titleText', 'streamUrl',
                    'mainText', 'redirectionUrl']
  
subject: Update date from creation time