old_contents: from django.db import models
  
  from wrestlers.models import WrestlingEntity
  
  
  class Card(models.Model):
  
      date = models.DateField()
  
      def __unicode__(self):
          return unicode(self.date)
  
  
  class Match(models.Model):
  
      card = models.ForeignKey(Card)
      participants = models.ManyToManyField(WrestlingEntity)
      winner = models.ForeignKey(WrestlingEntity, related_name="won_matches",
                                 null=True, blank=True)
  
      def __unicode__(self):
          return " vs. ".join([p.name for p in self.participants.all()])
  
new_contents: from django.contrib.auth.models import User
  from django.db import models
  
  from wrestlers.models import WrestlingEntity
  
  
  class Review(models.Model):
  
      reviewed_by = models.ForeignKey(User)
      reviewed_at = models.DateTimeField()
  
      class Meta:
          abstract = True
  
  
  class Card(models.Model):
  
      date = models.DateField()
  
      def __unicode__(self):
          return unicode(self.date)
  
  
  class Match(Review):
  
      card = models.ForeignKey(Card)
      participants = models.ManyToManyField(WrestlingEntity)
      winner = models.ForeignKey(WrestlingEntity, related_name="won_matches",
                                 null=True, blank=True)
  
      def __unicode__(self):
          return " vs. ".join([p.name for p in self.participants.all()])
  
subject: Add basic Review model and use it for matches.