old_contents: from django.db import models
  from django.contrib.contenttypes import generic
  
  from templates.mixins import TemplateMixin
  
  from entropy.base import (
      AttributeMixin, EnabledMixin, OrderingMixin,
      TitleMixin, SlugMixin, TextMixin
  )
  
  from settings import CONTENT_MODELS
  
  
  # class DisplayInstance(models.Model):
  #     '''
  #     Displays are reuseable
  #     '''
  #
  #     display = models.ForeignKey('View')
  #     platform = models.ForeignKey('platforms.Platform')
  #     position = models.ForeignKey('positions.Position')
  #     links = models.ManyToManyField('menus.Link', blank=True, null=True)
  #
  #     def link_ids(self):
  #         return self.links.values_list('pk', flat=True)
  
  
  class View(AttributeMixin, EnabledMixin, TitleMixin, SlugMixin, TemplateMixin):
      """
      A View of ViewLinkage or Widgets with a given template.
  
      Some templates accept parameters, such as slideshow duration
      """
  
      blurb = models.TextField(blank=True, default='')
  
      def contents(self):
          '''
          Return the content for this display
          '''
          return [
              content for content in
              self.viewlinkage_set.prefetch_related('content_object')
          ]
  
  
  class ViewLinkage(EnabledMixin, OrderingMixin):
      """
      ViewLinkage for View
      """
  
      view = models.ForeignKey('View')
  
      content_type = models.ForeignKey(
          'contenttypes.ContentType',
          limit_choices_to={'model__in': CONTENT_MODELS},
          blank=True,
          null=True
      )
      object_id = models.PositiveIntegerField()
      content_object = generic.GenericForeignKey('content_type', 'object_id')
  
      def render(self):
          '''
          The method would render the html of the content
          '''
          try:
              return self.content_object.render()
          except AttributeError:
              # Warning we're failing silently here.
              return ''
              # TODO
              # If no render method exists; inspect
              # the object for some fields and try
              # to render a suitable preview.
  
  
  class Viewable(TemplateMixin, TitleMixin, SlugMixin, TextMixin, EnabledMixin):
      """
      This is a sample test model which defines a content
      type for our display and is used for testing purposes.
      """
      pass
  
new_contents: from django.db import models
  from django.contrib.contenttypes import generic
  
  from templates.mixins import TemplateMixin
  
  from entropy.base import (
      EnabledMixin, OrderingMixin, TitleMixin, SlugMixin, TextMixin
  )
  
  from settings import CONTENT_MODELS
  
  
  # class DisplayInstance(models.Model):
  #     '''
  #     Displays are reuseable
  #     '''
  #
  #     display = models.ForeignKey('View')
  #     platform = models.ForeignKey('platforms.Platform')
  #     position = models.ForeignKey('positions.Position')
  #     links = models.ManyToManyField('menus.Link', blank=True, null=True)
  #
  #     def link_ids(self):
  #         return self.links.values_list('pk', flat=True)
  
  
  class View(EnabledMixin, TitleMixin, SlugMixin, TemplateMixin):
      """
      A View of ViewLinkage or Widgets with a given template.
  
      Some templates accept parameters, such as slideshow duration
      """
  
      blurb = models.TextField(blank=True, default='')
  
      def contents(self):
          '''
          Return the content for this display
          '''
          return [
              content for content in
              self.viewlinkage_set.prefetch_related('content_object')
          ]
  
  
  class ViewLinkage(EnabledMixin, OrderingMixin):
      """
      ViewLinkage for View
      """
  
      view = models.ForeignKey('View')
  
      content_type = models.ForeignKey(
          'contenttypes.ContentType',
          limit_choices_to={'model__in': CONTENT_MODELS},
          blank=True,
          null=True
      )
      object_id = models.PositiveIntegerField()
      content_object = generic.GenericForeignKey('content_type', 'object_id')
  
      def render(self):
          '''
          The method would render the html of the content
          '''
          try:
              return self.content_object.render()
          except AttributeError:
              # Warning we're failing silently here.
              return ''
              # TODO
              # If no render method exists; inspect
              # the object for some fields and try
              # to render a suitable preview.
  
  
  class Viewable(TemplateMixin, TitleMixin, SlugMixin, TextMixin, EnabledMixin):
      """
      This is a sample test model which defines a content
      type for our display and is used for testing purposes.
      """
      pass
  
subject: Remove AttributesMixin