old_contents: from __future__ import unicode_literals
  
  from django.db import models
  from django.conf import settings
  from django.core.urlresolvers import reverse
  
  from wagtail.wagtailcore.models import Page
  from wagtail.wagtailcore.fields import StreamField
  from wagtail.wagtailcore import blocks
  from wagtail.wagtailadmin.edit_handlers import FieldPanel, \
      StreamFieldPanel
  from wagtail.wagtailsearch import index
  
  from modelcluster.fields import M2MField
  
  
  class Resource(Page):
      date = models.DateField(blank=True, null=True)
      content = StreamField([
          ("authors", blocks.RichTextBlock(blank=True)),
          ("copyright", blocks.RichTextBlock(blank=True)),
          ("focus", blocks.RichTextBlock(blank=True)),
          ("factoids", blocks.RichTextBlock(blank=True)),
      ])
      embed_url = models.URLField()
      embed_thumbnail = models.TextField(blank=True, null=True)
      categories = M2MField("category.Category",
                            related_name="resources_by_category")
      language = models.CharField(max_length=7, choices=settings.LANGUAGES)
  
      search_fields = Page.search_fields + (
          index.FilterField('date'),
          index.SearchField('content', partial_match=True, boost=2),
          index.FilterField('categories'),
          index.FilterField('language'),
      )
  
      class Meta:
          ordering = ["first_published_at"]
  
      def get_absolute_url(self):
          return reverse("resource-detail", kwargs={"slug": self.slug})
  
      def get_template(self, request, *args, **kwargs):
          self.template = "resources/resource_detail.html"
          return super(Resource, self).get_template(request, *args, **kwargs)
  
      def get_context(self, request, *args, **kwargs):
          return {
              'resource': self,
              'request': request
          }
  
      content_panels = Page.content_panels + [
          FieldPanel('language'),
          FieldPanel('embed_url'),
          FieldPanel('embed_thumbnail'),
          StreamFieldPanel('content'),
          FieldPanel('categories'),
          FieldPanel('date'),
      ]
  
new_contents: from __future__ import unicode_literals
  
  from django.db import models
  from django.conf import settings
  from django.core.urlresolvers import reverse
  
  from wagtail.wagtailcore.models import Page
  from wagtail.wagtailcore.fields import StreamField
  from wagtail.wagtailcore import blocks
  from wagtail.wagtailadmin.edit_handlers import FieldPanel, \
      StreamFieldPanel
  from wagtail.wagtailsearch import index
  
  from modelcluster.fields import M2MField
  
  
  class Resource(Page):
      date = models.DateField(blank=True, null=True)
      content = StreamField([
          ("authors", blocks.RichTextBlock(blank=True)),
          ("copyright", blocks.RichTextBlock(blank=True)),
          ("focus", blocks.RichTextBlock(blank=True)),
          ("factoids", blocks.RichTextBlock(blank=True)),
      ])
      embed_url = models.URLField()
      embed_thumbnail = models.TextField(blank=True, null=True)
      categories = M2MField("category.Category",
                            related_name="resources_by_category")
      language = models.CharField(max_length=7, choices=settings.LANGUAGES)
  
      search_fields = Page.search_fields + (
          index.FilterField('date'),
          index.SearchField('content', partial_match=True, boost=2),
          index.FilterField('categories'),
          index.FilterField('language'),
      )
  
      class Meta:
          ordering = ["-first_published_at"]
  
      def get_absolute_url(self):
          return reverse("resource-detail", kwargs={"slug": self.slug})
  
      def get_template(self, request, *args, **kwargs):
          self.template = "resources/resource_detail.html"
          return super(Resource, self).get_template(request, *args, **kwargs)
  
      def get_context(self, request, *args, **kwargs):
          return {
              'resource': self,
              'request': request
          }
  
      content_panels = Page.content_panels + [
          FieldPanel('language'),
          FieldPanel('embed_url'),
          FieldPanel('embed_thumbnail'),
          StreamFieldPanel('content'),
          FieldPanel('categories'),
          FieldPanel('date'),
      ]
  
subject: Order by descending order of resources.