old_contents: from django.db import models
  from django.contrib.auth.models import User
  from taggit.managers import TaggableManager
  
  class Checklist(models.Model):
      title = models.CharField(max_length=512)
      owner = models.ForeignKey(User)
      content = models.TextField()
      created = models.DateTimeField(auto_now_add=True)
      modified = models.DateTimeField(auto_now=True,auto_now_add=True)
      deleted = models.BooleanField(default=False)
      tags = TaggableManager()
      # To add: type
  
      def __unicode__(self):
          return self.title
  
new_contents: from django.db import models
  from django.contrib.auth.models import User
  from taggit.managers import TaggableManager
  
  class Checklist(models.Model):
      title = models.CharField(max_length=512)
      owner = models.ForeignKey(User)
      content = models.TextField()
      created = models.DateTimeField(auto_now_add=True)
      modified = models.DateTimeField(auto_now=True,auto_now_add=True)
      deleted = models.BooleanField(default=False)
      tags = TaggableManager(blank=True)
      # To add: type
  
      def __unicode__(self):
          return self.title
  
subject: Make tags an optional field of Checklist