old_contents: from django.db import models
  
  from taggit.managers import TaggableManager
  
  class BaseModel(models.Model):
      name = models.CharField(max_length=50, unique=True)
      
      def __unicode__(self):
          return self.name
      
      class Meta(object):
          abstract = True 
  
  class AlphaModel(BaseModel):
      tags = TaggableManager()
  
  class BetaModel(BaseModel):
      tags = TaggableManager()
  
new_contents: from django.db import models
  
  from taggit.managers import TaggableManager
  
  class BaseModel(models.Model):
      name = models.CharField(max_length=50, unique=True)
      tags = TaggableManager()
      
      def __unicode__(self):
          return self.name
      
      class Meta(object):
          abstract = True 
  
  class AlphaModel(BaseModel):
      pass
  
  class BetaModel(BaseModel):
      pass
  
subject: undo changes for django-taggit 0.9.1