old_contents: import datetime as dt
  
  from comics.core.models import Comic
  
  class MetaBase(object):
      # Required values
      name = None
      language = None
      url = None
  
      # Default values
      start_date = None
      end_date = None
      rights = ''
  
      @property
      def slug(self):
          return self.__module__.split('.')[-1]
  
      def create_comic(self):
          if Comic.objects.filter(slug=self.slug).count():
              comic = Comic.objects.get(slug=self.slug)
              comic.name = self.name
              comic.language = self.language
              comic.url = self.url
          else:
              comic = Comic(
                  name=self.name,
                  slug=self.slug,
                  language=self.language,
                  url=self.url)
          comic.start_date = self._get_date(self.start_date)
          comic.end_date = self._get_date(self.end_date)
          comic.rights = self.rights
          comic.save()
  
      def _get_date(self, date):
          if date is None:
              return None
          return dt.datetime.strptime(date, '%Y-%m-%d').date()
  
new_contents: import datetime as dt
  
  from comics.core.models import Comic
  
  class MetaBase(object):
      # Required values
      name = None
      language = None
      url = None
  
      # Default values
      active = True
      start_date = None
      end_date = None
      rights = ''
  
      @property
      def slug(self):
          return self.__module__.split('.')[-1]
  
      def create_comic(self):
          if Comic.objects.filter(slug=self.slug).count():
              comic = Comic.objects.get(slug=self.slug)
              comic.name = self.name
              comic.language = self.language
              comic.url = self.url
          else:
              comic = Comic(
                  name=self.name,
                  slug=self.slug,
                  language=self.language,
                  url=self.url)
          comic.active = self.active
          comic.start_date = self._get_date(self.start_date)
          comic.end_date = self._get_date(self.end_date)
          comic.rights = self.rights
          comic.save()
  
      def _get_date(self, date):
          if date is None:
              return None
          return dt.datetime.strptime(date, '%Y-%m-%d').date()
  
subject: Add new boolean field MetaBase.active