old_contents: from django.db import models
  from django.utils.text import slugify
  
  from common.models import TimeStampedModel
  
  
  class List(TimeStampedModel):
      name = models.CharField(max_length=50)
      slug = models.CharField(max_length=50, editable=False)
  
      def __unicode__(self):
          return self.name
  
      def save(self, *args, **kwargs):
          self.slug = slugify(self.name)
          super(List, self).save(*args, **kwargs)
  
  
  class Item(TimeStampedModel):
      list = models.ForeignKey(List)
      name = models.CharField(max_length=100)
      completed = models.BooleanField(default=False)
  
      def __unicode__(self):
          return self.name
  
new_contents: from django.contrib.auth.models import User
  from django.db import models
  from django.utils.text import slugify
  
  from common.models import DeleteSafeTimeStampedMixin
  
  
  class List(DeleteSafeTimeStampedMixin):
      name = models.CharField(max_length=50)
      slug = models.CharField(max_length=50, editable=False)
      author = models.ForeignKey(User, related_name="lists_authored")
  
      def __unicode__(self):
          return self.name
  
      def save(self, *args, **kwargs):
          self.slug = slugify(self.name)
          super(List, self).save(*args, **kwargs)
  
  
  class Item(DeleteSafeTimeStampedMixin):
      list = models.ForeignKey(List, related_name="items")
      name = models.CharField(max_length=100)
      completed = models.BooleanField(default=False)
      author = models.ForeignKey(User, related_name="items_authored")
  
      def __unicode__(self):
          return self.name
  
subject: Attach user with List and Item