old_contents: from django.db import models
  from django.conf import settings
  
  from django.utils.translation import ugettext as _
  from django_extensions.db.fields import CreationDateTimeField
  
  
  class Vote(models.Model):
      """
      Mixin for generating an invoice reference.
      """
      created = CreationDateTimeField(_('created'))
      project = models.ForeignKey(settings.PROJECTS_PROJECT_MODEL)
      voter = models.ForeignKey(settings.AUTH_USER_MODEL,
                                verbose_name=_('voter'), blank=True, null=True)
  
      def __unicode__(self):
          return "{0} -> {1}".format(self.voter, self.project)
  
      class Meta:
          unique_together = (('project', 'voter'), )
  
new_contents: from django.db import models
  from django.conf import settings
  
  from django.utils.translation import ugettext as _
  from django_extensions.db.fields import CreationDateTimeField
  
  
  class Vote(models.Model):
      """
      Mixin for generating an invoice reference.
      """
      created = CreationDateTimeField(_('created'))
      project = models.ForeignKey(settings.PROJECTS_PROJECT_MODEL)
      voter = models.ForeignKey(settings.AUTH_USER_MODEL,
                                verbose_name=_('voter'), blank=True, null=True)
  
      def __unicode__(self):
          return "{0} -> {1}".format(self.voter, self.project)
  
      class Meta:
          unique_together = (('project', 'voter'), )
          ordering = ('-created', )
  
subject: Sort votes by created desc