old_contents: from django.conf import settings
  from django.db import models
  from django.template.defaultfilters import truncatechars
  from django.utils.translation import ugettext_lazy as _
  from django.utils.safestring import mark_safe
  
  from django_extensions.db.fields import (
      CreationDateTimeField, ModificationDateTimeField)
  from djchoices import DjangoChoices, ChoiceItem
  from fluent_contents.models import PlaceholderField
  from fluent_contents.rendering import render_placeholder
  
  from bluebottle.utils.serializers import MLStripper
  
  GROUP_PERMS = {
      'Staff': {
          'perms': (
              'add_page', 'change_page', 'delete_page',
          )
      }
  }
  
  
  class Page(models.Model):
      """
      Slides for homepage.
      """
  
      class PageStatus(DjangoChoices):
          published = ChoiceItem('published', label=_('Published'))
          draft = ChoiceItem('draft', label=_('Draft'))
  
      title = models.CharField(_('Title'), max_length=200)
      slug = models.SlugField(_('Slug'), unique=False)
      full_page = models.BooleanField(default=False, help_text=_(
          'Show this page in full page width.'))
  
      # Contents
      language = models.CharField(
          _('language'), max_length=5, choices=settings.LANGUAGES)
      body = PlaceholderField('blog_contents')
  
      # Publication
      status = models.CharField(
          _('status'), max_length=20, choices=PageStatus.choices,
          default=PageStatus.draft, db_index=True)
      publication_date = models.DateTimeField(
          _('publication date'), null=True, db_index=True,
          help_text=_("When the entry goes live, status must be 'Published'"))
      publication_end_date = models.DateTimeField(
          _('publication end date'), null=True, blank=True, db_index=True)
  
      # Metadata
      author = models.ForeignKey(
          settings.AUTH_USER_MODEL, verbose_name=_('author'), editable=False,
          null=True)
      creation_date = CreationDateTimeField(_('creation date'))
      modification_date = ModificationDateTimeField(_('last modification'))
  
      class Meta:
          ordering = ('language', 'slug')
          unique_together = ('language', 'slug')
  
      def __unicode__(self):
          return self.title
  
      def get_meta_description(self, **kwargs):
          request = kwargs.get('request')
          s = MLStripper()
          s.feed(mark_safe(render_placeholder(request, self.body).html))
          return truncatechars(s.get_data(), 200)
  
new_contents: from django.conf import settings
  from django.db import models
  from django.template.defaultfilters import truncatechars
  from django.utils.translation import ugettext_lazy as _
  from django.utils.safestring import mark_safe
  from django.utils.functional import lazy
  
  from django_extensions.db.fields import (
      CreationDateTimeField, ModificationDateTimeField)
  from djchoices import DjangoChoices, ChoiceItem
  from fluent_contents.models import PlaceholderField
  from fluent_contents.rendering import render_placeholder
  
  from bluebottle.utils.serializers import MLStripper
  from bluebottle.clients import properties
  
  GROUP_PERMS = {
      'Staff': {
          'perms': (
              'add_page', 'change_page', 'delete_page',
          )
      }
  }
  
  
  def get_languages():
      return properties.LANGUAGES
  
  
  class Page(models.Model):
      """
      Slides for homepage.
      """
  
      class PageStatus(DjangoChoices):
          published = ChoiceItem('published', label=_('Published'))
          draft = ChoiceItem('draft', label=_('Draft'))
  
      title = models.CharField(_('Title'), max_length=200)
      slug = models.SlugField(_('Slug'), unique=False)
      full_page = models.BooleanField(default=False, help_text=_(
          'Show this page in full page width.'))
  
      # Contents
      language = models.CharField(
          _('language'),
          max_length=5,
          choices=lazy(get_languages, tuple)())
      body = PlaceholderField('blog_contents')
  
      # Publication
      status = models.CharField(
          _('status'), max_length=20, choices=PageStatus.choices,
          default=PageStatus.draft, db_index=True)
      publication_date = models.DateTimeField(
          _('publication date'), null=True, db_index=True,
          help_text=_("When the entry goes live, status must be 'Published'"))
      publication_end_date = models.DateTimeField(
          _('publication end date'), null=True, blank=True, db_index=True)
  
      # Metadata
      author = models.ForeignKey(
          settings.AUTH_USER_MODEL, verbose_name=_('author'), editable=False,
          null=True)
      creation_date = CreationDateTimeField(_('creation date'))
      modification_date = ModificationDateTimeField(_('last modification'))
  
      class Meta:
          ordering = ('language', 'slug')
          unique_together = ('language', 'slug')
  
      def __unicode__(self):
          return self.title
  
      def get_meta_description(self, **kwargs):
          request = kwargs.get('request')
          s = MLStripper()
          s.feed(mark_safe(render_placeholder(request, self.body).html))
          return truncatechars(s.get_data(), 200)
  
subject: make language loading dynamic