old_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  from model_utils.models import TimeStampedModel
  from ordered_model.models import OrderedModel
  
  
  class SponsorLevel(OrderedModel):
      name = models.CharField(_("name"), max_length=20)
      conference = models.ForeignKey(
          "conferences.Conference",
          on_delete=models.CASCADE,
          verbose_name=_("conference"),
          related_name="sponsor_levels",
      )
  
      class Meta(OrderedModel.Meta):
          unique_together = ["name", "conference"]
  
  
  class Sponsor(TimeStampedModel):
      name = models.CharField(_("name"), max_length=200)
      link = models.URLField(_("link"), blank=True)
      image = models.ImageField(_("image"), null=True, blank=True, upload_to="sponsors")
      level = models.ForeignKey(
          SponsorLevel,
          on_delete=models.CASCADE,
          verbose_name=_("level"),
          related_name="sponsors",
      )
  
      def __str__(self):
          return self.name
  
new_contents: from django.db import models
  from django.utils.translation import ugettext_lazy as _
  from model_utils.models import TimeStampedModel
  from ordered_model.models import OrderedModel
  
  
  class SponsorLevel(OrderedModel):
      name = models.CharField(_("name"), max_length=20)
      conference = models.ForeignKey(
          "conferences.Conference",
          on_delete=models.CASCADE,
          verbose_name=_("conference"),
          related_name="sponsor_levels",
      )
  
      def __str__(self):
          return self.name
  
      class Meta(OrderedModel.Meta):
          unique_together = ["name", "conference"]
  
  
  class Sponsor(TimeStampedModel):
      name = models.CharField(_("name"), max_length=200)
      link = models.URLField(_("link"), blank=True)
      image = models.ImageField(_("image"), null=True, blank=True, upload_to="sponsors")
      level = models.ForeignKey(
          SponsorLevel,
          on_delete=models.CASCADE,
          verbose_name=_("level"),
          related_name="sponsors",
      )
  
      def __str__(self):
          return self.name
  
subject: Fix sponsor level name in the django admin